I miss some layers on Windy that I find handy.
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Current aurora and aurora forecast
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TPW (Total Precipitable Water). Like the one they have on Earthnullschool. I like to see how much water there actually is in the air in kg/m2. Not only the dew point temperature.
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Feels like-temperatures
Also, I wish it was possible to modify colors for the weather warning types, and the weather radar.