41–50 of 119 posts
I don't see that reflected in this map at all fwiw. https://sf.atmo.ai/temperature@37.83200,-122.51075,13.53,20,...
Earlier quoted context omitted.
Thanks for the feedback. We will have the back button fixed quickly :)
Same thing in firefox, and pleeease have a units switch. Would be infinitely more useful if I could view the site in the units my brain normally works in rather than having to think about the conversion all the time. Very cool site otherwise, also very cool bay area right now.
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
I mean up or downsampling is trivial. The question isn't if you can make a raster at any resolution, its if you can make a raster thats accurate and precise at that resolution. Its not clear to me that this is either.
Running over in Rodeo valley (Marin) there was a very noticeable (and unusual) inversion this morning around 7:30 am. It must have been 5-10 degrees colder on the valley floor compared to up higher -- after ~100ft of elevation gain up out of the valley it warmed up very rapidly. I don't see that reflected in this map at all fwiw. https://sf.atmo.ai/temperature@37.83200,-122.51075,13.53,20,...
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…
This chapter on Numerical Weather Predictions [0] is great, especially the section on "Forecast Quality and Verification" (p777). The eye-opener for me was "Binary/Categorical Event". An example of a binary event is rain, one model could predict rain correctly but a second model might not predict the rain at all. This doesn't mean the second model was completely wrong, it still predicted the rain but it predicted the rain passing further to the south.
[0] https://www.eoas.ubc.ca/books/Practical_Meteorology/mse3/Ch2...
I've also noticed some model are better than other at predicting one phenomena while other models might be better in certain regions. For example, many people report that Canada's GDPS is better at higher latitudes whereas NOAA's GFS is better at equatorial regions.
One final note, just because someone is solving an WRF model without verifying the results, doesn't mean it's wrong. Many numerical techniques and physical models within WRF have been validated analytical and experimental models. But it is also true that someone can naively setup a WRF model that gives bad results.
I use a 900m WRF model that predicts the wind shadow around an island and we use it to find the best beach for a picnic - and it works. But this same model predicts the general pattern of rain but it doesn't get the start and stop time of rain correct.
People get fixated on accuracy as a single thing and use it as a single basis for argument but to take a quote from the chapter [0] above "One of the least useful measures of quality is forecast accuracy" (ref. p777, Forecast Quality and Verification, third paragraph).
This needs to be done for more cities in California, especially Los Angeles with its huge geographic area and all the diverse micro climates contained within. Sometimes the weather changes more than 15 degrees in half as many miles from the coast. It therefore doesn't make sense to e.g. check "weather in LA" when its going to be somewhat wrong most of the time depending on where in LA you happen to be, since the litt…
This needs to be done for more cities in California, especially Los Angeles with its huge geographic area and all the diverse micro climates contained within. Sometimes the weather changes more than 15 degrees in half as many miles from the coast. It therefore doesn't make sense to e.g. check "weather in LA" when its going to be somewhat wrong most of the time depending on where in LA you happen to be, since the litt…
I feel like you could make a whole movie about the weather in LA. It would change your life. Twice.
Wow, this is the future.
I see no sign that forecasting has improved at all in my part of the world. Auckland, New Zealand.