Monday, September 25, 2017

Decisions, Decisions

After living with my CNC G0704 since last spring, I'm pretty happy with it.  I can see a few things to improve it and reasons not to do anything.  Lately I've been asking myself what's worth doing.  I thought I'd update on what's going on in the shop. 

The three things that would make life a bit better are - in no order at all:
  • Improve the enclosure
  • Implement a standard way of handling and changing tools, probably the Tormach Tooling System
  • Swap the motor - or change the way it's implemented - to double or triple the spindle RPMs.  Also, add turning it on or off and setting RPMs from the computer. 
The short story on the enclosure is that it wasn't very well documented and it's almost a bit of an afterthought.  It's not very robust and isn't the way I think I'd do one if I were starting from scratch.  I've seen better looking, and doubtlessly more expensive enclosures since then. 

The enclosure was based on one that Hoss built for his mill, and like many folks, my conversion was based on his DVD.  Of the many CNC-converted Grizzly G0704 mill/drills out there, it seems that the majority use some version of his approach.  It's not really shown on the DVD I bought, but rather there's a handful of videos on YouTube and many details get talked about in his CNCZone Forum.  

On the other hand, the purpose of the enclosure is to keep the chips and overspray from my misting cooling system inside, and it definitely does that and does it pretty well.  With the exception of the top rail being low so that when I lean inside I bang my head on it about 25% of the time (I am learning to reflexively bend over), it works.  It rattles if you bang it, but the latches hold it down, so this is a pretty minor "nice to have" upgrade. 

The Tormach Tooling System would be an absolutely necessary addition if I was a professional shop trying to recover my costs of doing things.  But I'm not.  For those folks not familiar, the way tools are mounted in mill like this (like most) is with a tool holder that goes inside the spindle.  That holder will hold the cutter, a drill chuck, or other tools.  The G0704 uses an industry standard spindle size, called R8, and R8 collets for all sorts of tool sizes, dedicated tool holders like drill chucks or other things can be found.  The way I change tools now frequently requires me to change the collet and the cutter, then find the new position of the tool.  Back in June, I told about a "touch plate" that uses a piece of software to set the Z = 0.000 inch point. 

What Tormach does is use one slightly-modified R8 collet that is permanently mounted in the spindle.  This is sized for a 3/4" diameter tool, and they have a series of holders that are a 3/4 bar on one end and a custom holder of some sort on the other end.  The feature here is that if the collet is slightly loosened, the tool and holder combination can be swapped with another combination and the system registers the position of the new cutter very precisely in all three dimensions. 
The holders are intended to be used with an automatic tool changer, but can be mounted by hand.  The R8 holder system uses a large bolt (7/16-20) that draws the collet up and tightens the hold on the tool; that task is frequently automated with a power draw bar that releases one tool and then grabs its replacement once the tool is mounted.  The act of tightening the draw bar is what precisely positions the cutter.

In principle, once you find zero for your axes, you always know where X=0 and Y=0 are, and the only axis that might change is just where Z=0 is, if the tool is longer or shorter.  My touch plate can give me that.  What this means is that it might take me extra time to change the collet, change the cutter or drill bit and re-zero, but if I'm not trying to minimize my cycle time in order to keep my price down, do I care?   Except for the obvious neatness factors, I'm not sure I do.

The big drawback to having a separate holder for every tool is that I'd need a separate holder for every tool.  Right now, my tool box has a lot of different size cutters in it.  Many of them need the same size holder, 3/8", but it would be extreme to get one for every cutter in the drawer.  There's a small number that I use the most often.  They would get a separate holder and a permanent place in a software tool table, so that my controller software knows the diameter and length of the tool. 

How much does all this neatness cost?  It could easily run several hundred bucks.  I haven't actually run up a total cost, but I've seen an eBay seller with "clones" of the TTS holders at about $18 each, including shipping (from guess where), if I buy 10.  In addition to those, I'll need collets for the tool end of the tool holder.  There's a few series of standard collets, called ER and then two digits to designate the series.  ER-16, ER-20 and ER-32 are commonly used and I'm likely to need a bunch of those.  In the case of the 3/8 shank end mills prices on Little Machine Shop tell me I'd need an ER-16-9 collet at $9.66 (based on being one of a set of six different sizes), and a TTS ER collet holder at $34.75.  That's $44.41 to hold one tool - and those are "real" TTS tools, not the cheap clones.  As a WAG, I could cut that to about $25 each.  Still not insignificant if I have 10 or 15 tool holders. 

Yet it seems all it really does for me is to make getting a precise Z-axis position easier, a task I've already automated.  Since I'm not trying to shave seconds of a mass production product, it just doesn't seem to matter. 

Finally, the motor.  Here I know the least amount of hard details, but the issue I'm trying to fix is that the max spindle RPM I can get is around 2200.  Another thing to upgrade is that I currently turn on the motor manually by pushing a button on the mill and set the speed with a knob next to it, but both of those operations are simple, standard CNC code.  I just don't have a control that works over the interface yet. 

Virtually every time I'm cutting aluminum, my speeds and feeds calculator tells me to run higher RPMs than 2200.  What's wrong with going 2200 when the software would rather have me go 3600 or 4400?  It wears out the tools faster.  Tool life is a balance of how fast it rotates and how fast it cuts into new metal.  On the other hand, whenever I cut steel, the recommended spindle RPM drops down well below the 2200 limit.  The current motor is specified at 1 HP (750W) and while I'm not sure it even does that (I know... running downhill with the wind at its back), I don't think I'd want to go much above that.  I understand that 3 phase motors are quieter but that will require an electronic box called a Variable Frequency Drive.  A motor like this has been recommended to me.  Whatever motor I'd choose would end up needing an encoder to send speed information back to the controller program, and would need to accept control inputs. 
(Automation Direct GS3-21P0 VFD)

Again, I'm looking at around $500 to implement a better motor.  I might only need the higher RPMs sometimes, but it would be quieter all the time, and I could control it with my CNC control box. 

Since I'm not Elmer J Fudd, millionaire, this raises the usual questions everyone has about the budget only being so big.  Of the three, the motor upgrade might well be the most expensive, but it seems to  make the most sense. 


Sunday, September 24, 2017

The Day Got Away From Me

Didn't pay a moment's worth of attention to the world outside or whatever the Trump Derangement Syndrome Outrage of the Day is, so cartoon!  This is one of my all time favorite Dilbert cartoons; perhaps my most favorite.  I had a faded, slightly-yellowed newspaper version of this on my bulletin board for nearly 18 years back when I was working.  Not quite from the first time it appeared in 1994, but close.
Recently appeared here


Saturday, September 23, 2017

Mythbusting - Economatrix Style

A couple of days ago, The Vulgar Curmudgeon posted a piece called "This is Why You Never Get Ahead".  It's a good economatrix summary, and although I know we've discussed lots of that here, it's good to see lots of good graphics.  Both Raconteur Report (a new link in my blog reading list) and Bayou Renaissance Man did summaries of it.

So why am I here?  It really comes down to one comment from someone who's just not awake to what's really going on; a comment at both Bayou RM and Vulgar Curmudgeon.  I don't want to pick on just this guy because other comments say basically the same thing.
Looking at that chart, we see that a new car doubled in price between 1990 and 2014. That's 24 years. Using the "rule of 72" that I learned in Econ 101, we can easily determine the average annual rate of inflation is 3%. This is also the official rate. I don't see the problem.
Instead of arguing over whether real inflation is his 3% or closer to 9% like Shadowstats calculates (using the methods from 1980 instead of today's methods), I have a different approach.  If you like the 1990 method better, Shadowstats provides that on the same link - using the 1990 method, inflation is closer to 5-1/2%, but again, even though either one of those numbers obliterates his argument, I don't want to go there.  Where I want to go with this is to step back and ask, why should there be inflation at all?  Why do we expect inflation?  The Fed targets 2% inflation, what's a reasonable amount? 

I maintain the ideal value for inflation is 0%.

Since we started out talking about car prices, why should a car get more expensive at any fixed rate?  I can see cars getting more expensive as car makers add mandated features and other costs, but an iron law of manufacturing is that the more experienced you are at making something, the cheaper it gets.  Why aren't cars getting cheaper over the years instead of more expensive?  Are they paying more for materials? Probably, but again, why?  Why should the prices of aluminum, plastic, or iron have anything to do with the nominal inflation rate?   I can see there might be real supply/demand unbalances that make some materials more expensive, but why would supply/demand unbalances produce a curve that looks like "...the average annual rate of inflation?"

Let's not talk about cars.  It's really easier to see with a house.  Have you ever asked why should your house get more valuable with time?  If you're not continually improving it by upgrading things that you'll sell with it, your house should be worth less as it ages, not more.  It's getting older; it's deteriorating.  If the area where you live becomes more desirable, the price would go up, and if your neighborhood has become less desirable, the price would go down. Yet everyone expects to sell their house for more than they paid.  Why should that be?  

Notice the "50 Year Trend Line" of housing prices going up?  Notice that the continuous rise of that line starts around 1971 when Nixon got us off the gold standard? 

Has it occurred to you that our system might be based on a continually devaluing currency?  That's exactly what's going on.  The currency gets worth less and less every year, due to Federal Reserve manipulations.  It's what they're trying to do.  In 1970, gold was $35/ounce while today it's hovering near $1300/oz.  If gold is your measuring stick, today's dollar buys $35/$1300 of what it did then, just under 2.7%.   

There's a difference between inflation and actual economic growth.  Economic growth comes from creating new wealth; either producing things others value out of raw materials, growing crops or mining new things out of the ground: whether minerals like diamonds or metals like iron.  I like to think of this from the viewpoint of the Information Theory of Money: wealth is created by adding information.  A car is good example here.  Creating the car creates wealth for the people who design and make the car.  Now smash that car into a wall at a high rate of speed.  Every single molecule that was present before the crash is present after the crash; what's missing is the ordered information that arranged those molecules into the car.  The pile of parts is worth much less than the shiny new car because the information is now gone.  That's saying that the real wealth; the real worth of the car is the information.  Creating the car consisted of imposing new information on raw materials.  That was the creation of wealth.  Creating currency by manipulating digits in a computer is not creating wealth at all.  What it's doing is diluting all the other currency that already exists, making each unit worth less.  That's inflation. 

The monetarists at the Federal Reserve define GDP growth as economic activity, deliberately conflating inflation with actual economic growth. 

Wages have been in stagnation since the mid 1960s.
On average, workers born in 1942 earned as much or more over their careers as workers born in any year since, according to this research — and workers on the job today shouldn’t expect to catch up with their predecessors in their remaining years of employment.
Workers born in 1942 were probably working for a living by 1960 to 1962, perhaps 1964.  From the group of men that entered the labor market in 1967 to the group that entered in 1983, median lifetime income of men declined by 10%–19%. This problem has been going on for more than the 50 years back to 1967.   Most people will say it's because of off-shoring or outsourcing jobs or blame it on the Evil Rich People.  Bill Bonner had a good summary in a piece I quoted more than a year ago
Most economists (and politicians) have blamed world trade for stagnant U.S. wages. The median wage in China is only $8 a day. No wonder U.S. factory hands can’t catch a break; who can compete with that? 

But Germans compete with the Chinese, too. And their wages have gone up! In real terms, after adjusting for inflation, wages in France and Germany have been going up at a 0.7% rate for the past 15-20 years.
While the Germans and the French have a central bank, they're not working under the US Federal Reserve.  Not having the so-called "Reserve Currency", perhaps their banks are required to be not quite as manipulative as ours, allowing some sanity.  

Well, I often say the only privilege that comes with running a blog is getting to respond with a wall of text to a comment.  Today, I respond with a wall of text to a comment that wasn't even to my blog.  It just seem to me that not enough people ever ask why there should be a constant increase in the prices of everything.
Cars with most of their information mostly removed, rendering them worth far less than when their information is intact. .

Friday, September 22, 2017

US Navy to Use X-Box Controllers on Most Advanced Subs

It's safe to say that only a very tiny portion of the population has actually been in a modern submarine so what we think we know is heavily influenced by Hollywood.  Depending on your age, your first thought is probably either something with tons of analog gauges and dials from vintage movies, or something with computer monitors from a more recent flick.  The fast attack submarine USS John Warner is called "the Most Advanced" submarine in the fleet, and is filled with sophisticated computers with flat-screen monitors to replace much of the conventional instruments and gauges. In those old submarines movies, the periscope was a single optical tube that would be raised above the surface so that a submerged submarine could get a look around.  One man at a time could look.  In the John Warner, those days are gone:
It's been replaced with two photonics masts that rotate 360 degrees. They feature high-resolution cameras whose images are displayed on large monitors that everyone in the control room can see. There's no barrel to peer through anymore; everything is controlled with a helicopter-style stick. But that stick isn't so popular.
The stick is a system designed by defense giant Lockheed Martin - LockMart, as we call them - and it's a $38,000 box.
"The Navy got together and they asked a bunch of J.O.s and junior guys, 'What can we do to make your life better?' " said Lt. j.g. Kyle Leonard, the USS John Warner's assistant weapons officer, referring to junior officers and sailors. "And one of the things that came out is the controls for the scope. It's kind of clunky in your hand; it's real heavy."
The solution?  A video game controller, Microsoft's X-Box controller, something very similar to the Logitech Rumblepad that I just added to my CNC milling machine.
The Xbox controller is no different than the ones a lot of crew members grew up playing with. Lockheed Martin says the sailors who tested the controller at its lab were intuitively able to figure out how to use it on their own within minutes, compared to hours of training required for the joystick.

The Xbox controller also is significantly cheaper. The company says the photonic mast hand grip and imaging control panel that cost about $38,000 can now be replaced with an Xbox controller that typically costs less than $30.
(Photo source)

The crew, after all, is primarily young men who grew up in a digital world playing video games. What could be more natural than a game controller?
The John Warner at her public commissioning ceremony.  Wikimedia photo.
The Navy says that the system has gone through extensive testing over the past two years and that the Xbox controller will be included as part of the integrated imaging system for Virginia-class subs beginning with the future USS Colorado, which is supposed to be commissioned by November.
Just a nifty little story.  Caught my eye because of the similarity to the hardware I've just started using.


Thursday, September 21, 2017

Ambitious... and Impressive

A shop built 1/3 scale model of a V-10 engine with Electronic Fuel Injection.  And, yes, that is a supercharger on top.


Full build details at the Model Engine Maker forums (where you can look at the 20 pages of text and pictures without being a member).  It took about three years of maker Keith5700's time to design and build this impressive little (125cc) engine.  If I understand it correctly, no CNC was involved.  All pieces made by turning the hand cranks on mill or lathe.  Lots of very precise drafting.  Lots of the ideas involved and the skills needed came from an earlier V8 model that he finished in 2013.  

The guy is an amazing artist in metal.


Wednesday, September 20, 2017

What Happens If Maria Meets Jose?

As most of you know, while Hurricane Maria has made all the news today as almost certainly the strongest hurricane in the modern era to hit Puerto Rico, Tropical Storm Jose was sitting off the mid-Atlantic coast as it has all week, aggravating fishermen while exciting surfers.  A storm only sits in one place due to a lack of steering currents, which means the large scale movement of air masses has halted in that area.  A strong low behind a cold front would fling Jose out to sea.  A strong high would fling it into the coast. 

The model runs on the two storms are a study in contrast.  The model runs out to 5 days for Maria show strong agreement that it continues on a more northerly course, paralleling the coast while staying well offshore at least through the 5th day.  The model runs for Jose look like a cat horked up a hairball or someone threw a loose handful of yarn on the map.  A handful of models bring it onshore the Delmarva peninsula, and another group shoves it opposite that, offshore.  Others send it to New Jersey, Virginia, Pennsylvania or most anywhere. 

With my lame photoediting  skills, I combined the NHC plots for both storms into one graphic.  The scales they use are slightly different, so I made them line up around the Outer Banks, NC. 
Simply, both of these can't continue as they are for a full week.  Something's gonna give.  In these plots, it's helpful to remember the stippling means that the storm can be anywhere in that area.  Maria's 5-day location covers what looks to be roughly 500 miles, consistent with the accuracy of about "100 miles per day" that the old forecasters claim.  Jose, though has an oval of uncertainty that looks to be 800 miles or more across - from onshore anywhere from Virginia to New Hampshire,  to still at sea, a bit east of where it is right now. 

So what happens?  There is an uncommon phenomenon called the Fujiwara Effect, named for a Japanese meteorologist, in which the storms start to circle each other and then spiral into each other, becoming one storm.  At their closest - in this plot - they look to possibly be within a couple of hundred miles. With tropical cyclones, they typically interact within about 850 miles, according to that Wikipedia article.  They are absolutely going to be that close to each other, that is, according to tonight's models.  The Fujiwara interaction happens on occasion in the Atlantic basin, but not often.  We may get to see it.

To me, what hurricanes "decide" to do is like whatever two consenting adults decide.  I don't care if they check into a Motel 6 and merge repeatedly.  As long as they keep their Fujiwara-ing away from anyone else, and don't hurt anyone while they're at it.


Tuesday, September 19, 2017

Tesla's Push for Self-Driving Cars Driving Off Engineers

Tesla CEO Elon Musk has famously been pushing for "auto pilot" and fully autonomous cars, saying in October of 2016 that all new Teslas would have self-driving capabilities.  I've been covering some of the autopilot crashes of those self-driving cars as data comes around.  By that I mean that I don't hang out on Tesla user's groups looking for stories of accidents.  On the other hand, the technology needs to get some light focused on it.  It's not ready for Prime Time and Tesla finally seems to be acknowledging that.

This week, Design News presented an article with a few "fun facts" that indicate US consumers are really skeptical about autonomous cars.  First, a Gartner's Survey shows that 55% of respondents would not ride in an autonomous car.
The Gartner Consumer Trends in Automotive online survey, conducted from April 2017 through May 2017, and polled 1,519 people in the U.S. and Germany, found that 55 percent of respondents will not consider riding in a fully autonomous vehicle, while 71 percent may consider riding in a partially autonomous vehicle.
It turns out people seem to have taken lessons from things like the Equifax data breach - along with so many others - to heart and are concerned about security along with the general category of "technology failures".
"Fear of autonomous vehicles getting confused by unexpected situations, safety concerns around equipment and system failures and vehicle and system security are top concerns around using fully autonomous vehicles," explains Mike Ramsey, research director at Gartner.
Gartner isn't unique in finding this; AAA found similar results.
A new report from AAA reveals that the majority of U.S. drivers seek autonomous technologies in their next vehicle, but they continue to fear the fully self-driving car. Despite the prospect that autonomous vehicles will be safer, more efficient and more convenient than their human-driven counterparts, three-quarters of U.S. drivers report feeling afraid to ride in a self-driving car, and only 10 percent report that they’d actually feel safer sharing the roads with driverless vehicles.
Three-quarters of drivers are afraid to ride in a self-driving car?  That's quite a bit more than the 55% Gartner found, but those numbers are more like each other than not.  There's a lot of anxiousness about the technology.  Still, AAA reports that while the majority are afraid to ride in a fully self-driving vehicle, the survey also found that a bigger majority (59%) wants to have autonomous features in their next vehicle.  This apparent contradiction suggests that drivers are ready to embrace autonomous technology, but they are not yet ready to give up full control.  People are responding with a skeptical "prove to me it works" attitude. 

I wasn't aware of the impact at Tesla itself until the Design News article.  Summarized in Inc. Magazine,
Musk's fervent vision of a driverless world repeatedly clashed with his team's view on the progress of the technology. The dispute led Sterling Anderson, then Autopilot director, to resign just two months after the October announcement. Since his departure, at least 10 other engineers and four top managers -- including Chris Lattner, who had been selected as Anderson's replacement and lasted just six months on the job -- have also left.

This isn't the first time dissent among Tesla engineers has been reported. In July 2016, after a fatal crash killed a driver using the Autopilot function, CNN reported that several employees tried to warn Musk about the reliability of the technology, and that it wasn't ready to be deployed to consumers.
The team working on Tesla's Autopilot feature felt uneasy about marketing the technology as "fully autonomous."  They felt they didn't yet have a product that could "safely and reliably control a car without human intervention."  In other words, they felt like the 55 or 79% of consumers surveyed who didn't want to trust their lives to the self-driving cars. 

This is called engineering ethics.  We're always required to voice our opinions and point out unsafe or improper things.  At some point, if the company doesn't respond, the only ethical thing left is to quit. 
The driver of this Tesla says that when she was parking in front of her gym, it jumped into high acceleration, jumped the curb and hit the wall.  Tesla flatly says "nope", their monitors say she stepped on the gas.  Could be.  Hey - it's not your typical Tesla picture, that's all I was looking for.



Monday, September 18, 2017

Turning Aluminum Cans into an AR Lower

There are few 20 minutes videos that I've watched that haven't had me reaching to see if I could skip over some nonsense.  This one had my complete attention for all 19 minutes.  Farmcraft101 takes five pounds of saved aluminum cans and recycles them by melting and casting an AR-15 lower.  H/T to ENDO for the link.


I've got to say his PPE (personal protection equipment) made me cringe a little, but that's the only thing I can be critical of.  Upper arm-length, heavy, leather gloves combined with shorts and bare legs while pouring molten metal is enough to make me cringe.  The rest of it is great stuff to know.

That said, I have to wonder if the metal would be useful for most things.  When you see things saying they're made from "Aircraft Aluminum" or an alloy like 6061-T6 or 7075, that's a specific composition of alloying elements in specific proportions, and T6 is a specific heat treatment.  If I took a pound of 6061-T6 cutoffs and melted those down, instead of soda cans, I wouldn't end up with 6061-T6.  All metals are like this, really.  Steel, brass, aluminum, titanium or whatever, the properties you see depend on the ingredients (alloy) and how they're treated.  Anyone who has taken the mechanical engineering classes on materials has seen something like this iron/carbon phase diagram.  The different colors code for different microstructures in the steel, the temperatures and concentrations of carbon that lead to their formations.  There are similar curves for aluminum and its main alloying additions - silicon and magnesium in 6061 or zinc and magnesium in 7075, for example.

That said, an AR lower has got to be pretty non-critical.  It's not just that plastic lowers are a thing, and can be bought in any quantity from an handful of companies, there's that guy who made one from HDPE - the plastic used to make kitchen cutting boards.  If a cutting board works, it's probably not a high-stress application. 


Sunday, September 17, 2017

Something Completely Different

While I don't do it often, I keep seeing folks on my regular reading list posting a little music on weekends, especially Sundays.  I don't do that as a rule, and I'm not planning to, but I came across what I thought to be a remarkable performance by Glen Campbell in a link from Acoustic Guitar magazine.


Acoustic Guitar tells the story:
Glen Campbell first heard The Lone Ranger’s brisk theme song as a kid and vowed to learn it on guitar. Not only did he do just that, Campbell made the theme—an overture from the 1829 opera William Tell, by the Italian composer Gioachino Rossini—one of his signature numbers. He revisited it throughout his career, wowing audiences by playing it with casual ease, sometimes with the guitar on top of his head. [link added - SiG]
I would never describe myself as a Glen Campbell fan and never thought of him as a virtuoso guitarist.  In my mind, Glenn Campbell associates with his late '60s hits: Wichita Lineman, Galveston, By The Time I Get to Phoenix, and that's about all.  Maybe the stereotype of country music: "three chords and the truth".  That said, I find this an amazing performance.  Not just the blazing speed, but the casual, almost carelessness he plays with.  Virtually all guitarists, no matter how many years they've played, spend a lot of time watching their left hand on the neck. Glenn glances there, but looks around a lot, too.  He seems to be talking to people out of the view of the camera.

It brings to mind another cliche' I've heard about music in general.  Practice a thing perfectly a thousand times and you play it well.  Practice it a thousand times a thousand and it plays itself through you.  I think the William Tell overture is playing itself through Glen.


Saturday, September 16, 2017

Farewell Cassini

NASA's probe orbiting Saturn, Cassini, ended its 13 year mission yesterday with a fiery entry into the gas giant's atmosphere.
NASA received its last data transmission from the Cassini spacecraft at 4:55:46 a.m. PDT (7:55:46 a.m. EDT, 1146 GMT) today (Sept. 15), before losing contact with the probe as it hurtled into Saturn's atmosphere. It was a fiery grand finale  for the probe, which spent 13 years orbiting the ringed planet. NASA officials expect that Cassini broke apart about 45 seconds after that final transmission, due to the intense friction and heat generated by the fall.
Properly called the Cassini-Huygens mission, the probe was a joint venture of NASA, the European Space Agency, and the Italian Space Agency.  It was launched in 1997 and arrived at the Saturn system in 2004. In 2005, the Huygens lander dropped onto the surface of Saturn's largest moon, Titan, revealing the hidden world beneath its opaque, orange atmosphere.  The Huygens lander detected lakes and seas of liquid hydrocarbons such as methane, ethane, propane and some heavier compounds on Titan.  Liquid methane boils to the more familiar (here!) gas at −161.49 °C or −258.68 °F. , so that gives you a perspective on just how cold it is there.  The temperature at the landing site was 93.8 K (−179.3 °C; −290.8 °F). 

The Cassini orbiter's initial mission was meant to last until 2008 but was extended twice, stretching the spacecraft's life to 2017.
Artist's image of Cassini as it burns and breaks up during entry into Saturn's atmosphere.

There are some "best of" pictures at MSN Look at those at full size. If you know the mission, many of them will be familiar. 

As an aside, a month ago, I did a piece on Voyagers 1 and 2, the first man-made objects to leave our solar system. I mentioned a PBS special that was going to air on September 23, The Farthest. That was the night we got home from our trip to see the eclipse, and I set the DVR to record it.  It's worth watching if you haven't seen it.  Was it everything I'd have liked them to cover?  No.  It was short of some of the important techie details and long on details about the album the Voyagers carry with recordings of music and voices from Earth.  Too artsy for me.  Like I always say, when the typical commentator talks about diversity, they mean people of different ethnicities or colors.  Real diversity is putting engineers and artists together.  I've met enough of all of them to know I have far more in common with black, Asian or Indian engineers than I do with any dancer I've ever met. 



Friday, September 15, 2017

Nanny State Madness - Put Calories on Grocery Receipts

From the Nanny Madness of the UK, a proposal to put "food quality" scores on grocery receipts. 
Well, a new proposal says the “traffic lights” system – widely adopted on food and drink packaging since 2013 – should be migrated from individual items to entire receipts. Forget the problem of making it through checkout without impulse-buying three bags of bonbons and a copy of Heat! magazine; now it is about the half-price pizza catapulting your basket into “red” territory.  

“Instinctively, it seems like a good idea,” says Ed Morrow, campaigns manager at the Royal Society for Public Health. “If health information is just on the product, it’s easy to ignore, but if you get another reminder at the till you might start to compare receipts, see what you’ve scored each time, then try to do better. Doing things that gamify the experience of shopping can be a good motivator in terms of changing behaviour.” That is if you want your midweek trip to Tesco to be gamified: is this just 21st-century code for the nanny state? “It’s not telling people what to do,” Morrow says. “All it does is provide people with extra information.”
Sheer madness.  Let's start with the knowledge that there's no evidence that forcing restaurants to put calorie counts and nutrition summaries on menus does anything.  In fact, the evidence is that the requirement to post nutrition counts makes work for restaurants and raises prices but consumers don't care.  Now let's extrapolate to the grocery receipt.  This is based on the assumption that what the buyer bought is eaten between grocery store trips as it came from the store, and not prepared into meals combined with other things they already have or buy elsewhere.  The buyer could just as well be feeding friends, donating food, or storing it so that it's eaten over a longer length of time or at some time in the future.  All of the nutritional guidelines are based on consuming a mix of foods in meals and the quality of the meal is based on comparison to standard daily intakes of some amount of food.  There is simply no way to get that from a grocery list, unless everything that person buys is  precooked meals from that store and that's all they ever eat. 

Let's go with a simple example.  Someone buys some food that the food police code as red.  Then they go to another shop and buy other things coded green to make a meal that changes the nutritional data completely.  The article states it's likely to be accurate in the long run, but I don't see how.  Averaging bad data doesn't make it good data.  It just makes a bad average.
The proposed "traffic light" method.

Mrs. Graybeard and I have a running joke that the purpose of buying celery is to put it in the refrigerator until it gets limp and has to be thrown out.  That's an exaggeration, of course (exaggeration is the essence of humor), but we honestly think we've thrown away more celery than we've eaten.  That's a way to bias the data, too.

Nutrition codes on a grocery receipt are meaningless information that aren't going to affect anything, are based on several faulty premises, and will create costs that the poor customers are going to have to pay for - so that they can ignore it.

But remember the line in the first clip from the article where Ed Morrow said, “It’s not telling people what to do?”  Anna Taylor, executive director at the Food Foundation. removes any doubt that telling people what to do is exactly what this is about.  It just uses a Cass Sunstein "Nudge" approach.
“What would be really interesting is if the retailers link it to algorithms set up for loyalty cards for those who want it,” says Taylor. “So, if a till receipt shows lots of reds, you might get vouchers to buy more veg. That’s when it could start to get really powerful. But let’s be clear: the whole food system has to work harder to make the easiest choices the healthy choices. That’s what needs to change.” 
No, Ms. Taylor.  What needs to change is you.  You need to go away. 


Thursday, September 14, 2017

One Last Irma Post

I promise.  It's just that the whole subject kind of has a built-in expiration date.  Denninger has a similar post with some similar data, so I thought I'd show some more. 

During the day Sunday as the storm was working its way north, I recalled watching the wind speeds reported back from NOAA buoys during Matthew and thought I'd watch Irma approach.  There's a webpage with a graphical front end,  that allows you to zoom in on an area, click on a buoy's location, and read the conditions its reporting.  Not every one reports everything, so you may have to experiment to find what you're looking for.  Here's the map you see when zoomed in around Florida.
You'll notice I have three of the yellow diamonds circled.  These are Key West, Vaca Key and Naples.  (Red diamonds are buoys that are offline).  If you'll recall, the storm crawled along the north coast of Cuba, then hung a right and went for the Keys.

By the time I remembered to look up this web site, it had already gone through and I didn't know where it went.  So I looked at both Key West and Vaca Key (on Marathon).  Neither of them had a wind measurement over 60 knots - 69 mph while the official winds were 150.  How could they miss it?  Were they both so far from the eyewall they missed the strong winds?  Now the distance from Key West to Vaca Key is about 50 miles, and Hurricanes 101 says the strongest winds exist only in eye wall, but it's still a puzzling result.  Did the hurricane thread the needle between them? Yes, it turns out it did, making landfall at Cudjoe Key, which is virtually the halfway point.  If the eye is 10 miles diameter (a wild-assed guess), that means about 20 miles from the innermost eyewall to either buoy.  I know the winds tend to drop off with distance, but that fast?

One of the reasons I thought to come to look at these buoys is that I noticed the same thing last year during the buildup to Matthew.  Official winds were in the neighborhood of 150 mph, but I never found a buoy that went above 100, even ones the storm had gone right over.  Unfortunately, I didn't write anything down. 

Still, I was puzzled.  So as the storm crept toward Naples, I picked that buoy to monitor.   Here's a screen capture.
I've highlighted in red the time, between 4:54 and 5:00 PM, that the eye went over the buoy.  The winds dropped to under 10 knots and the barometric pressure dropped to its minimum 27.75 inches.  But note the winds right before and right after the eye passage: 22 knots: 25mph.  Now look for the highest winds near those times.  The highest wind before the eye was 42.9 kts or 49.4 mph.  The strongest wind after the eye passed was 55.9 kts or 64.3 mph, an hour after the depth of the eye.  These are not a hurricane force winds, which start at 74 mph. Irma was not a hurricane when she hit Naples. 

I keep coming across little things that make it seem that they systematically overstate the winds.

For one example, on Saturday morning, one of the admins at Central Florida Hurricane posted that he was watching the wind speed coming in from the hurricane hunter aircraft, and they were showing the wind at 122 mph.  Minutes later, the Hurricane Center posted the official forecast and it said winds were 155. Why?  On the other hand, they dropped the winds to 125 on the next update, so maybe it was just too late for them to incorporate the new data.

For another example, I found this interesting comment on Watts Up With That by a guy calling himself FLengineer (no relation).  There's a lot of detail here on NOAA changing the way they report winds.   The quote is actually too long to post here, but let me grab a little bit of it:
After digging into the specs and extracting the measurements from the transmitted data it looks like the advisory intensity is purely based on a peak wind speed measurement over a 10 second interval at flight level between 2200-3000 m altitude. I found a decent paper on the measurement equipment aboard the aircraft from 2007 (http://www.aoml.noaa.gov/hrd/Uhlhorn/MWR2007Uhlhorn.pdf) and thought some of their conclusions were interesting.

Prior to 2005 intensity was determined by a model that took the flight level winds and extrapolated 10m surface winds from those. In 2005 the planes were outfitted with an updated SFMR radar that measures the ocean surface emissivity which is correlated to surface wind speeds. Due to lots of tropical activity in 2005 the new radar was able to help derive a better physical model matching the readings with dropsonde data.

In their conclusions the earlier quadratic models consistently underestimated winds at speeds > 50 m/s (111 mph). They also found that earlier boundary layer models were underestimating winds in the eyewall by as much as 10% when compared to dropsonde readings.

So are the storms more intense because of increased SST or because of better models, higher frequency sampling, changes to peak measurements from 1 minute averages, and improvements in the sensor equipment?
...
If we look at the most recent Air Force data in Irma the peak flight level wind was 133 kts (153 mph) SFMR surface wind was 120 kts (138 mph) and same 88% linear adjustment would extrapolate 134 mph. NHC 11 pm advisory for Irma is 160 mph.
What does it all mean?  Beats the heck out of me!  Here we have several lines of data showing that when winds are measured in the monster hurricane, it's not what's being described. 

I know that measuring and quantifying these things isn't easy, but there seems to be a systematic tendency of the NHC to over hype every hurricane.  The NHC itself has not been friendly to the "global warming causes hurricanes" crowd, and one of the NHC's chief scientists, Dr. Chris Landsea, withdrew from the IPCC reports over their reports not being backed by science.  Maybe they're just covering their uncertainty about what to forecast by getting everyone in the state to leave.  We know the Weather Channel and virtually all of the news channels make their ratings and their advertising money on storms.  I know that I've seen TV weather folks whom I respect who will tell you to your face that "we have to make it as dramatic as possible to get people to leave".  But what if they don't have to leave?  What if leaving put them in more danger from other things.  How many stories did you hear of people who evacuated south Florida to the west coast and ended up going right into the worst possible place? 

I've seen this described as the biggest mass evacuation in history. 

Evacuating costs real money.  Did they negatively impact someone's life by having them take on the burden of running from the storm?  You've got to know that a lot of people can't really afford to drop whatever motels were asking for a few nights, and even more for meals.  What if they came home to a looted home? 

Let me leave you with a fun fact.  After looking around at various buoys from the keys up through Ft. Myers, and looking at some reports off that NOAA bouy page, I found one buoy with hurricane force winds: Fowey Rocks buoy, off the coast of Miami, pretty much 115 miles from both Cudjoe Key and Naples. 


$318 Billion in One Day

A few weeks ago, I said there's no debt ceiling.  Just ignore the hype coming out of DC and know that you can absolutely count on them not being grownups, not showing any fiscal restraint and eventually raising the debt ceiling.  There has been a legal debt ceiling since 1917 and they've never not raised it before, so why should we expect that with the fractured mess we have in DC now that they'd suddenly grow up now?

As predictably as the coming sunrise, a deal to increase the debt ceiling was reached; the only novelty being that this time the president dealt directly with the Evil Party instead of the traitorous members of his own party.  (As an aside, while we decry Mitch McConnell for being spineless and the Stupid Party for being unable or unwilling to do anything they ran on doing, you have to credit Chuckie Schumer for being, perhaps, the most effective senator on the hill, simply for the amount of time he gets his way).  As they've done before, the Treasury Department magically slowed the rate of debt increase by special means, the rest of us call that "lying", and then on last Friday the national debt suddenly and equally magically increased $318 Billion in One Freaking Day, so that now we're well over the $20 Trillion National Debt level.
“Yeah, we need to cut spending, but we can't do it now!  We need to provide relief for those Hurricane Harvey victims in Texas!  It's different this time, not a regular debt ceiling!”  Don't worry, though, there will be something else next time to prevent the discipline.  Don't we remember Pelosi saying there's nothing left to cut in the budget?  The fact is that they'll never cut the budget.  It just ain't happening.  There are far too many people and groups who depend on that flow of money - and those people and groups funnel money to the ruling class to perpetuate the system.

Over a dozen years ago, Dick Cheney famously said, “Deficits don’t matter.”  In the short term, that might be true.  Seed corn wouldn't matter if you knew there'd never be another tomorrow.  Hungry?  Eat the seed corn.  If there was no tomorrow, there'd be no reason not order a few extra desserts, no reason not to have a few more drinks, no reason not do just about anything.  But there is a tomorrow.  You need to plant the seed corn so you can eat next year.  You might find the extra drinks lead to a hell of a hangover.

Since there is a tomorrow, the debt will matter.  I can't tell you just when or just how it all comes crashing down, but it's fake.  There is no real wealth backing it up, just phony money.  It's the biggest pile of phony money in the history of the world, and it's going to make the biggest mess in the history of the world. 



Wednesday, September 13, 2017

Surviving Irma - The Lessons Learned Post

Irma taught me a few lessons that I think might be useful to more people than just me.  Some things worked exceptionally well, others not so much.  Times like these where a total reliance on your SHTF plans is when weaknesses can be exposed.  This didn't happen in Matthew last year, but with Irma, a massive hole in our plans was exposed.

Let me lead with our biggest lesson.  I'll phrase it like most of us learned it as kids.
Don't put all your eggs in one basket.
There's a more modern, more up to date, more tactical version of that common wisdom, "two is one and one is none".  Same idea.

In our case, the "eggs in one basket" was that we weren't going to lose electricity long term because we have a LNG-powered whole-house backup generator.  That belief colored everything we did.  As the power went out on Sunday night while the storm was building, the generator fired up and came on as it has done a few times in the past.  All seemed normal.  Monday morning, while we were still under steady 25 mph winds with gusts to about 40, we had a knock on the door.  It was the fire department.  Someone had called to report a gas leak, and they found our generator.  They told us it was blowing raw fuel in the exhaust and to turn it off.   The SW winds were in position to blow the fumes away from the house and I would have never smelled it.

I called the company that had done the installation and the owner came out within a few hours.  He said it was blowing more fuel than it should, but said, "if it was me, I'd be running it", after telling me he really can't say that for liability reasons.  That left me in a quandary, though, of "should I run it or will my neighbor call out the fire department again?"  We opted not to run it, except for an hour a day to try to keep the food in the freezer frozen.

This is another issue.  I see people talking about running their small generator just a few hours a day to keep the refrigerator cold.  I have a remote reading thermometer that I can put in the refrigerators and none of them will cool off in a couple of hours a day.  Is the issue that the modern, high-energy efficiency refrigerators get their efficiency by sacrificing peak cooling capacity?  It seems possible to me.  Maybe if we had a generator on one hour, off one hour all day, or on one/off two, that would work.  A hidden drawback of "all the eggs in one basket" is that we have a big freezer and buy some frozen foods for months ahead of time because we're sure we're not going to lose electricity long term.  We stand to lose a lot more money's worth of food without that power. 

Important background info.  In July, we received a letter from Generac telling us that there was a potential problem in the generator, the fuel plenum that might have rust damage and it cause this exact failure mode - I've since learned the plenum is essentially a buffer that provides a surge of fuel when the generator gets a load surge.  The letter said to schedule an inspection for a typical cost of $80, and if the plenum is bad, they'll provide the replacement and reimburse the $80.  With the eclipse trip coming and a few other things in life, we said we'd schedule the inspection when we got home, and promptly forgot to get it done immediately.  The tech who installed the plenum just left a little while ago, but our power came on last night about an hour short of 48 hours being out.  Internet and cable came back after that.

The problem isn't really going without electricity.  Yeah, it sucks, but we had some ways around that.  We have several batteries (things like these or these are very useful) that can act as backups, a small solar panel to charge the big one, and keep some things charged, but nothing that would keep our freezer or refrigerators going because we had assumed the generator would be there.  In other words, I was blind to that weak spot.
I'll return to that concept.

Having a barely-working generator, we relied on batteries.  The next tweak we could do to our preps would be to have fans that run a quieter.  We have a camping fan but it was loud for trying to sleep next to.  I have a 500 Watt inverter for that large 12V battery on the solar cells.  It will power things on 120V with about a 20% energy penalty (I assume the inverter is 80% efficient; I haven't really measured it).  It also has a fan that's a bit loud.  These are relatively minor annoyances.  Getting a fan that won't deplete 8 D cells or one of the jump starter/cell phone charger batteries overnight is a really good idea.

There were positive lessons, too.  What worked well?

Until Hurricane Erin in 1995, we basically had no preps.  Not even plywood and concrete nails.  We put in a system based on the POMA components that can be bought at Home Depot.  These are corrugated aluminum panels that are very impact resistant, held to the wall with permanent anchors in the concrete and 1/4-20 stainless hardware.  It takes a few minutes per window to put them up and when taken down, the stack easily fits in one corner of the garage.  Each panel is 15" wide, but with varying heights, so they stack in that width, and front to back take up no more than a couple of feet.

We also added a "hurricane rated" garage door, although I think it's only rated to the bottom of Cat 3, 115mph.  I reinforce it from the inside to try to offset the forces of it pressing in. 

LED lights, in particular these, are great.  There might be a similar product from someone else, but they work as an area light or handheld.  Several levels of brightness and I never used the highest. 
The whole concept of having the solar panel to charge my 35 AH battery so that it can run things overnight or longer worked out.  If the sun is bright, we can charge the battery at close to a 2A rate, but using it for more than about 12 AH of energy means there's barely one charge/discharge cycle per day.  I think I need to scale the system up.

Cooking was trivial.  There was no need for a propane stove or to use the charcoal grills.  Our LNG range has a piezoelectric ignition so that when we turn on the gas, it lights without a pilot light.  When the electricity is out, all we need to do is hold a match or lighter near the burner and ease the gas on.  When we partitioned our energy to run some things on gas and others on electricity, we gained that.  Hot water for dishes or showers or other uses, unfortunately, needed electricity to control the tankless (LNG) water heater. 

At the risk of overstating the obvious, it became painfully obvious that the quality of life in the aftermath of the storm was determined by the available energy.  Electricity or gas, without some energy source, we're quickly returned to bare bones primitive life.  You can store that energy as big tanks of diesel, gasoline or propane, a liquefied natural gas (LNG) pipe (like we have for some of it) or electric energy in massive battery arrays.  Batteries have the specific energy disadvantage I've talked about before in the context of electric cars; basically, while an internal combustion engine uses a fuel tank and gets its oxidizer from the air, a battery has to provide its own oxidizer.  In the house, that turns into several square feet of some room to store the batteries.  In terms of the machinery to make life comfy, all machines break; all plans go sideways.  Spares are always good.  If not mandatory.

It's always reasonable to think of what can be improved, and my inclination is to get something that would power the most critical infrastructure: the freezer, the refrigerator, should the main generator not be available.  Perhaps add in a few lights and a small room unit air conditioner.  All of that could be accomplished in the metal shop, where I have a small Mini-Split air conditioner.  The question of how it's powered is up in the air.  Cover the south facing areas of my roof in solar cells or store some fuel with those attendant problems?  


Tuesday, September 12, 2017

Power is Back, Cable and Internet Shortly Later

Power came back tonight at 6:30, just about 47 hours after it went out Sunday.  Cable and internet were also out but came back by about 7:30. 

Stories will resume tomorrow, but the short summary is that we had more troubles with Irma than Matthew last year.  All of us are fine, if a little worn out.  Nothing that a good night's sleep can't fix. 


Sunday, September 10, 2017

It's A Really Poopy Night

The day wasn't that bad, but as the evening approaches and Irma moves north over the inland west coast, it's getting pretty nasty out.  Winds are around 45 gusting 60-65 and we've had about 2" of rain in the last 24 hours.  There have been tornado warnings every half hour or so, and one tore up a mobile home park about 15 miles south of us. 

The major development for Beast Irma has been a continued weakening, and a continued tendency to track toward the right of the expected path.  This is good for McThag and lots of people in the central and western parts of the state.  The weakening has been from dry air from the NW wrapping into the core.  Nothing kills a hurricane faster than cool, dry air. This is a NOAA satellite water vapor image of the dry air intrusion wrapping into the center.  I think you can make an argument that Irma has started the process of going "extra-tropical" which will turn it into a stormy low pressure system over the Illinois/Indiana/Kentucky region by Tuesday. 
I've had to do battle with a fence gate that kept opening, and eventually drove a piece of angle aluminum into the ground to (hopefully) keep it from blowing off its hinges (we hired a fence company and they didn't do a good job with this gate).  Count three trips across the backyard in foul weather gear getting those 50 mph winds in the face.  This gate is a regular a source of problems.  I wouldn't be in the least surprised to come out at daybreak and find the fence down. 

Got this picture in the mail and it's a striking composite radar image. 
The cloud cover is bigger than the entire state, about 500 miles from Key West to the Georgia border just north of Jacksonville.  The southern half of the storm is drying out and the radar is not showing much rain in that area.  Compare that to this cloud cover composite that's making the rounds.
We're in the worst 12 hours of it for central Florida.

Edit to add the power just went out and our generator is on. 


Winnie the Pooh and the Poopy Day

Based on this.

Irma has done a few interesting things in the last 24 hours. If you're obsessively observing the radar updates, like about a few hundred thousand Floridians, you would have seen the storm stick on the northern coast of Cuba long past the expected right hand turn. After that turn the path has been farther to the east (right) of the predicted path.  You can read that as it taking a harder right hand turn and going closer to straight north rather than a sweeping turn with a more northwesterly path.
The faint red line is, of course, the predicted path and you can see the eye off to the east of it.  In the 11 AM advisory, the red line has been shifted east about 50 miles.  While everyone loves to play forecaster in these situations, it looks like it's going to whack Naples, Ft. Myers, and Port Charlotte, then travel up the coast into Tampa before briefly emerging into the Gulf near Crystal River.  Port Charlotte is where 2004's Charley came ashore with 150 mph winds.  

Florida's west coast is going to get the whacking that the east coast was expecting to get just a few days ago.

As for us, it's just a blustery poopy day.  These things tend to come in squalls, and they're now making it well into tropical storm strength.  Still, unless the track goes farther east, we're "officially" not forecast to get hurricane force winds.

Since I'm a bit reluctant to do too much in the shop, should we lose power, I'll probably sit here and do updates if anything interesting goes on.


Saturday, September 9, 2017

Short Demo of my Logitech Rumblepad 2 Control for the G0704

I debated putting a long script together to narrate this, but didn't.  It ends up being kind of long.


Instead, a short demo.  The Rumblepad has a set of numbered buttons on the right.
I used the physical layout of the buttons to choose directions: 1 moves the X axis to negative numbers, while 3 moves the X axis to positive numbers.  Likewise, 2 Y axis to negative numbers , 4 is Y axis to positive numbers.  I use the 4-way rocker switch to control the rotary, A, axis.  Up is clockwise, down is counterclockwise.  The buttons visible in profile at the top, one over each of those controls are really two buttons vertically.  One is Z-axis up the other Z-axis down (both the left and right button pairs are the same).  (If you're easily confused, don't read the rest of this paragraph.  The mill operates backwards from that: the tool is stationary and the table moves opposite to what you think.  When I press the right arrow, the table moves to the left, but the relative motion of the cutter is to the right).

The game controller uses a wireless connection; I haven't looked for it on a spectrum analyzer, but I understand it uses the 900 MHz "Part 15" frequencies.  Since the Rumblepad has been around a long time, it has Windows drivers.  I was just able to plug the "base station" part into the USB port on my Win7 shop computer and have it recognize the hardware and load the drivers.  Mach 3 comes with a utility called Keygrabber that recognized it as a Human Interface Device (HID).  When I press a button, say the 1 key, Keygrabber highlights what I pressed and says it's not assigned.  Double click on that line and it offers you the option to either tap a key on the keyboard or pull up a menu and choose one of those selections.  In this case, I pressed the left cursor arrow key on my keyboard, and it assigned it to that action.

Making the video and playing with this today was just my way of dealing with the intractable boredom of waiting for the storm.  With all the preps in place, there's nothing else to do. 

Hope this is useful to someone!


Friday, September 8, 2017

Our Forecast Keeps Looking Better

24 hours after saying we needed to brace for Irma the forecasts keep getting better for us up here in the Silicon Swamp of central Florida.  Unfortunately, the forecasts have gotten worse for the west coast of the state.  Let me show you a forecast that the local National Weather Service Offices have been offering.  You have to look for it, but on the forecast page for a given city (clicking on the map) it's on bottom of the right side bar.  It's a graphic called the Hourly Weather Forecast.  If you click offshore, it gives a forecast of wave heights, swell period, and a handful of other things.  If you click over land, you'll get something like the graphic forecast for my area.
Wind forecasts are in the second panel down and the bottom panel.  The bottom panel is winds at 20 ft above the ground, the second panel is surface winds and gusts.

In both cases, the peak wind is about 11 AM on Sunday, and correspond to a tropical storm.  The second panel says winds 60 mph, gusting up to 75.  Gusts are specifically excluded in the definition of hurricane, which uses 1 minute wind speed.  According to this, we're not getting a category 1 hurricane, and nowhere near the Category 4 storm that looks to be coming ashore somewhere in the keys and then coming making landfall in the southern end of the state.  
 
Of course, all of this is subject to change.  If the storm comes up farther to the east, we'll get worse conditions, and likewise if it stays off the west coast it will be worse for the Tampa Bay area.  Peninsular Florida isn't very wide - it's around 140 miles at the widest point.  In a path like Irma's, the difference in the uncertainty of the path covers the entire state.  A small difference in path can mean a big difference in the winds a place gets.  The reason that forecast cone gets wider is the historical accuracy of the forecasts: essentially about 100 miles wider per day.  

Meanwhile, there's something about this graphic that strikes me funny; I laughed out loud when I noticed it.  The green line, third panel down, is relative humidity.  You'll notice that our relative humidity actually goes down in the hurricane compared to the night before (shaded gray).  At 82%, it's lower than any value after 9 PM the night before, and the same as 3 AM tomorrow morning. 

I suggest a new state motto:  Florida, where our weather gets better during a hurricane!  Or another possibility, Florida: where the hurricanes are only slightly more humid than a typical night! 


Thursday, September 7, 2017

Looks Like It's My Turn This Time

Much like Miguel down at Gunfree Zone, it looks like Irma's going to pay us a visit.  The track really hasn't changed in a few days.  The various model runs drift left and right, but that's just the inherent inaccuracy of such things.
The projected path crossing the state near Cape Canaveral (the bump midway down Florida's east coast) has been there for at least a day.  I'm a little south of the Cape.  No, we're still not in the white zone (3 day forecast) but we started putting up shutters this morning.  We started a bit too late after too much time dawdling over coffee so we'll finish either later this afternoon, if we get some clouds, or tomorrow morning.  I'll get up and out earlier. 

There's a saying that goes "prepare for the worst;  hope for the best" and that's where we are.  In aftermath of the first two big storms of the '04 season, Charley and Frances, the state emergency management folks were saying, "if you don't need to evacuate, just hunker down in place" to ride out the storm.  We live in a well-built house.  For example, one of the most critical things is that the roof is held down with fasteners and not just be held on the house by its own weight.  Our house was built that way, embodied in the post-Andrew building codes, despite being built 15 years before it was required.  Our addition, built in '14, is built that way, and includes storm windows rated to cat 5. 

That said, if yesterday's Irma came onshore with 185 mph winds, I don't think anything in the county that would go unscathed.  Maybe the old blast proof blockhouses on the Cape, except they'd probably flood.  There's just no reason to think we'll get a storm that strong.

Aside from fewer options for getting out of the house, life as normal until Saturday evening.


Wednesday, September 6, 2017

If Only They'd Promise to Shut Up

Courtesy of a link on Watts Up With That, we learn that experts at the World Economic Forum say we have three years left to save the planet from the worst damages of climate change.  Now why experts at an Economic forum should know anything about climate change is another question entirely.

If only they'd promise to shut up in three years, it would be worth whatever mythical disaster would happen from not doing anything.  The thing is, they'll never shut up.  After 3 years we'd get them saying, "see I told you so" for the next hundred years.
The rest of the article is bullshit, full of predictable demands that wealth be transferred to "Holy Green" industries, green causes, and other connected people making it hard not to think the three year number is bullshit, too. 
A planet devastated by climate change may seem like a distant future. But Earth is already experiencing effects today.

Globally, the mean rate of sea level rise increased 50% in the last two decades. In 2017, temperatures have already reached their highest levels in history in some areas, from California to Vietnam. And the past three years were the hottest on record.
The problem is that every single one of those points has been contradicted by other studies.  It's not the clear cut picture they portray.  The acceleration of sea level rise has been disputed or disproven, and the other points are covered by the most important contradiction: the study that showed when temperature adjustments are removed, nearly all warming goes away.  Actually, that's only one such study.  There have been others.  If the temperature record can't be trusted how do we know if California and Vietnam have really had their hottest temperatures?  Prince Charles updated his 2009 claim that “we have 100 months to save the world” after about 72 of those 100 months saying in 2015 that the deadline is 35 years out.  I'd say they should get their stories together, but inconsistency seems to be pretty common in the alarmist's world.

It can't get wetter and have a centuries long drought at the same time.  Pick one.  

Tuesday, September 5, 2017

"I Keep a Weather Eye on the Horizon"

To borrow a line from Mark Knopfler's "Cleaning My Gun".  Lots of my fellow Florida bloggers are keeping an eye on Irma and feeling a bit uncomfortable.  This morning, Irma has gone fully beast mode with sustained winds at 180 mph.  That said, it's not expected to stay Cat 5 for more than the next couple of days, and the models are having difficulty predicting what it does beyond three days. It's important to remember the area of the highest winds is actually pretty small, just the eyewall of the storm, but that lower winds can cover a large area over water.  McThag posts some computer runs from one of the good models (the GFS) for a couple of days that show how the wind fields can work out.

The current National Hurricane Center guys put up this 5-day forecast this morning:  
The way this is supposed to be read is that the storm can be anywhere in the stippled area at 8AM on Sunday.  The end location is about 500 miles in diameter, saying the center could be over the center of the state, or over southern Cuba which is the difference between hurricane winds over all of south Florida or not even having a nasty day.  

The morning spaghetti plot of all the models shows almost unanimous agreement that the storm is going to get picked up by an approaching low pressure system and turn north; the question is how soon it gets picked up and where it ends up hitting. 
Several of the models; the consensus if you will, have it turning right in the last 24 hours of that plot, and coming ashore somewhere on the southern tip of the state.  Some models have it turning much sooner, a few have it turning in the Gulf.  The largest difference is just where it tracks.  If it tracks along the center of the state it will weaken markedly.  If it tracks off either coast, it will be over some rather warm water and will weaken less.   

There's a difference between forecasting and reading computer models, but the NHC is pretty good.  Granted, they have a tendency to be melodramatic when a storm is close, they forecast a much, much worse scenario for Hurricane Matthew last October than we really got, but they still get pretty close.  I've read that they overstate the forecasts deliberately, saying that people won't evacuate unless they overstate it, but IMO that just feeds the cycle.  People see the overstated forecast (cat 4 hurricane onshore, death and destruction) vs. the reality (cat 3 storm well offshore, barely hurricane force winds onshore) and ignore the "official" forecasts. 

It takes two days to evacuate the keys, so folks down there should be getting out of town by Friday, maybe Thursday.  For us, midway up the East Coast, evacuation depends on what kind of storm we're getting and I don't see a way to know that for a few days.  I really doubt it could be a Cat 5 with any substantial land interfering with wind inflow, but if it stays off the East Coast, it could remain a Cat 4.  That would be exceedingly unpleasant, but I'm pretty sure the house would make it barring bad flying debris, a tornado, or something like that.  If it comes up the center of state, or rides the coast, I think it's cat 2 or cat 3.  I recall some storm in around '07 or '08, maybe Fay in '08, where the forecast called for it to intensify coming up the center of the state - I remember joking about that with co-workers wondering what planet something like that could happen on.  It did not intensify.

To steal a meme from Gunfree Zone
It looks like the next few days are going to be spent watching the path and how the big picture steering pattern develops.  Waiting to see when the storm turns right.  I think I've spent a couple of months of my life watching storms like this and trying to see when they turn right.