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300 meters resolution SF Bay Area Forecast

sf.atmo.ai

21–30 of 119 posts

Re: 300 meters resolution SF Bay Area Forecast

#21
post #18

A few thoughts from a geographer (be prepared to shoot me): - Basically every comment is wowed by this, but nobody questions what the accuracy is. I, too, can Krig interpolated surfaces to any resolution. - off-nadir view doesn't seem to offer much - We've been dealing with janky tile loading for like 20 years now. I really hope we'll get a much smoother approach for viewing these tiles as they load. The dissolve tra…

This seems to be a thing with weather models more generally. Somewhat relatedly, I've spent quite a bit of time evaluating weather models for use in India and Africa, and while predictions are easy to find, validation results for the predictions are very hard to find. And when you do find them, the results are pretty poor, with many models performing worse than if you would say "predict temperature on date X to be th…

100% agree. Scientists and engineers all know that you must provide validation results, accuracy/uncertainty calculations, etc. or your data is just a pretty guess. I think weather forecast models are so commoditized and useful for laypersons that we've UX'd all of the complexity (scrutinizing the data) out of the product. The most scrutiny I ever see are people discussing what "Probability of Precipitation" values really mean.

My grad thesis advisor encouraged me to actually get the Environment Canada models and learn how to run them (they're in FORTRAN). I could never make them spit out data consistent with what EC publishes. That's probably on me, but it was a real eye-opener to this whole domain's complexity.

Re: 300 meters resolution SF Bay Area Forecast

#22
shameless plug of my little rain map that has the opposite approach --

zero interpolation, zero forecasting. just the real data from the radar feed in 10 meter resolution at the current time (plus 3 past snapshots at 1 hour intervals):

https://truweather.link

and the app versions:

https://play.google.com/store/apps/details?id=net.conceptual...

https://apps.apple.com/ca/app/truweather/id1537614881

i find it useful because every other weather app is wrong in some way ;) instead, it enables you to form your own mental models

Re: 300 meters resolution SF Bay Area Forecast

#23

A few thoughts from a geographer (be prepared to shoot me): - Basically every comment is wowed by this, but nobody questions what the accuracy is. I, too, can Krig interpolated surfaces to any resolution. - off-nadir view doesn't seem to offer much - We've been dealing with janky tile loading for like 20 years now. I really hope we'll get a much smoother approach for viewing these tiles as they load. The dissolve tra…

Thanks for chiming in. I can make an animation say whatever I want. I am very curious about the accuracy. Unrelated: The site breaks my back button in Chrome, which is an unforgivable UI sin.

Thanks for the feedback. We will have the back button fixed quickly :)

Re: 300 meters resolution SF Bay Area Forecast

#27
If I had to guess they are running the WRF model [1][2]. The AI part is post-processing the model output. With a fair amount of reading the manual anybody can run their own WRF. WRF scales from running on a laptop to supercomputers with 1000s of cores.

[1] https://www.mmm.ucar.edu/models/wrf [2] https://github.com/wrf-model/WRF

Re: 300 meters resolution SF Bay Area Forecast

#28

What does "300 meters resolution" mean in this context?

Weather models divide the atmosphere into cells where each cell has it's own forecast. There are several ways to do it but if you imagine the cells as cubes, the north-south and east-west dimensions of the cube is 300m long. 300m is very high resolution for weather models with most running at a few kilometers to a few dozen kilometers.
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