@korina Hi Korina, tried it with another installation of a Firefox Nightly and you're right, it works as expected. I had a look @ my about:config, and I think I found the problem:
privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts was set to true to avoid tracking/fingerprinting of my browser. This seems to be a needed function for the correct display of the layers in Windy. When I set it to "false" and restart my browser, everything works fine. Anyways, this is a popular feature for security-minded people and there are also canvas-blocking addons installed by many people. Maybe you can pass that on to your developers so they can see if there is way to fix that? Thank you.
In the Alps the forecast is given at ground level, not at sea level.
You must know that global models with resolution such as 9km may give in mountains some inaccuracies. See models with higher resolution like ICON-EU or AROME.
You know that Windy is just visualizing Weather models developed by leading weather centers. I don't think they have recently changed dramatically their models.
Making a comparison between observation and forecast at this official weather station, there is not a very big gap concerning the wind.
Capture d’écran 2021-03-05 à 13.17.57.png
The discrepancy could be due to local wind conditions that global models cannot predict (only high resolution local models can do it)
You can use the tool "Observation vs forecast" and test different models: