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Old 14-01-2020, 06:46   #46
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Re: Windy.com. Wow!!

Quote:
Originally Posted by belizesailor View Post
Yes, a comprehensive comparison would be beyond the resources most sailors would be willing/able to invest...hmmm...maybe some form of "crowd" verification could work?

But, spot comparisons, actual usage experience, and less exhaustive comparisons I think do have some value. For example comparing NESDIS vs Copernicus currents, with a dose of experience, along the Panamanian coast is a pretty obvious evaluation.
Not too difficult in Python to do something...

This is live data against forecast for a UK Metoffice measuring station on the Isles Of Scilly , chosen as it's away from land and quite flat, plus anenometer is 10m. Forecast data is also met Office. The mouse wheel can zoom X or Y axis if you scool the wheel with the mouse just below x-axis or to the left of the y-axis. Legend top left turns different forecast on/off.
Remarkable just how accurate it is most of the time. Some flat lines in there as I never got round to automating it and forgot some days to run the script.



Scilly Wind – My First website

One day might get round to doing similar with GFS & openweather
https://openweathermap.org/

Almost no one has any idea about forecast accuracy, our ape brains just love to see patterns which aren't there Plotting lots of web available data is probably as good as you'll get for the vast majority of us.
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Old 14-01-2020, 06:50   #47
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Re: Windy.com. Wow!!

Yes, automating it should be relatively straight forward. Which forecast model is being compared in your graph?

This could be a great tool for sailors. Let them choose a spot where actuals are available then choose a model(s) to compare against and a duration of comparison, generate a graph at the end and maybe a % delta for each forecast period. This way they could evaluate which model to trust most for that location.
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Old 14-01-2020, 07:16   #48
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Re: Windy.com. Wow!!

Quote:
Originally Posted by belizesailor View Post
Yes, automating it should be relatively straight forward. Which forecast model is being compared in your graph?

This could be a great tool for sailors. Let them choose a spot where actuals are available then choose a model(s) to compare against and a duration of comparison, generate a graph at the end and maybe a % delta for each forecast period. This way they could evaluate which model to trust most for that location.
Forecast is UK Met office, they have an API to get the data. GFS data is easy to get online as well from various APIs, ECMWF probably not as it costs money. Automating wouldn't be hard, pythonanywhere online or just node-red on a raspberry pi.

For a quick fix windy might be as good a place as any, though no pretty graphs Bit breezy in the Scillies today...

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Old 14-01-2020, 07:25   #49
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Re: Windy.com. Wow!!

A bit breezy here in the SW Carib too! Easy enough to check, just stick your head outside...get a good grip on your hat first!

I think a lot of amatuer weather stations have poorly located anemometers. If you look around at actuals here they are mostly light to moderate winds, but its actually blowing like stink!

But the topograph in Central America makes wind forecasting more challenging as we have a lot of gap winds. Only the major ones are forecast like Tehuanpecer (MX) and Papagayo (Nic.). The minor ones, and there are loads of them, are not studied or forecast at all. We get a vicious one where we live...its gusting about 40 knots right now...2km away its dead calm.

Im and old school techie. Just recently begain getting back into tech again...playing w Arduino, Rasberry Pi, and ESP8266 boards...in C++ which I already knew. Python is really popular & powerful so need to learn it too...another off season project.



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Old 14-01-2020, 08:05   #50
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Re: Windy.com. Wow!!

Quote:
Originally Posted by belizesailor View Post
Im and old school techie. Just recently begain getting back into tech again...playing w Arduino, Rasberry Pi, and ESP8266 boards...in C++ which I already knew. Python is really popular & powerful so need to learn it too...another off season project.
Just going over to micropython to program esp32's, though uses up a fair bit of memory. But fascinating!! So many very acurate sensors to be had for pennies >> checking a few bucks barometer by a little node-red/python getting barometer readings by scraping local airport data from the web(purple stepped line)

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Old 14-01-2020, 08:34   #51
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Re: Windy.com. Wow!!

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Originally Posted by belizesailor View Post
Yes, it would be great if Windy would add GRIB viewing capabilities, but their official response is that it presents liscencing issues. This really only applies to ECMWF, but they make it as a blanket statement.

I assume Windy could be run over Iriduim Go or similar, but Ive never tried it.
Windy will not run over Iridium Go or other satellite service. Windy is a data hog and would require much more bandwidth and data speeds than what is currently available.

Besides the licensing issue (which they could make up for via subscriptions or adverts) with ECMWF, they would also have a problem partnering with a satellite service. Also, Windy does not have a standalone app for Mac or Windows computers.

I used Windy when sailing around Puget Sound. It was generally accurate; sometimes not. And other than places like Princess Luisa Sound I was rarely out of cell range and could connect to the service. If your inland or island hoping with 1 or 2 overnighters...Windy is a good solution.

IMHO, all models and predictions fall apart after 3 days...often sooner. If you're offshore coastal and out of cell range Windy is not the solution.

Many people taut the abundance of overlays available with Windy. But, Windy is clearly information overload. When we are bombarded with so much information we lose focus and productivity because we get sucked into it. (Lots of studies around info overload problems.)

Software should be designed to provide the critical information needed to help us make smart decisions and remove or hide the noise. Frankly, when I am looking at weather to make routing decisions things like nitrous oxide levels, the ozone, and dust index are pure noise.
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Old 14-01-2020, 08:45   #52
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Re: Windy.com. Wow!!

Quote:
Originally Posted by conachair View Post
Just going over to micropython to program esp32's, though uses up a fair bit of memory. But fascinating!! So many very acurate sensors to be had for pennies >> checking a few bucks barometer by a little node-red/python getting barometer readings by scraping local airport data from the web(purple stepped line)



Yes, the tech you can buy for a few $s these days is amazing. From chino venders you can get ESP dev boards for about $5 (though you may have to toss a few)....for about $10-15 you can buy from a more well known vendor and get a dev board w more featues.

I recently built an ultrasonic water tank monitoring system for use at home, but it could easily be adpated to boat use. Screenshot attached.

To collect data on our unstudied gap winds here, I would like to build very compact weather sensors which could be deployed in large numbers autonamously for mapping localized weather (in addition to the gap winds we have loads of micro climates in the highlands here...every few Km the climate changes). One GitHub project I looked at the guy was building self confirguring mesh networks by embedding ESPs in tennis balls...just toss em about in a field and... wallah! ...you have full coverage Wifi for your big event...anyone has poor signal, just throw em a tennis ball. Cool. Im thinking something similar for weather sensors.



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