Fog Altitude Limit?

Is there a limit of how high the fog can be? I sometimes cruise at 28,000 and the sky around me is white, and now blue.

Red sky in morning sailor take warning, Red Sky at night sailors delight! Now a white sky stumps me but a blue sky that what I call a great VFR Day…
Max Sends

(fog will disparate at the inversion layer! Basic WX science see wiki)

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Do you mean in IF? IF live mode just updates the current weather to the real world METAR data of the nearest airfield (if you fly within a certain distance). Unfortunately, the only weather capabilities IF has is temperature, wind direction, wind speed, and visibility. It just sets these for the entire atmosphere at all altitudes! As a result, if an airfield on the ground below you has 2 NM visibility, then even if you’re at FL400, you’ll only have 2NM visibility too!

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shame it cant take into account cloud base / height so below a certain height have the Viz same as at closest METAR airport and above that level get lovely clear sky…

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That’s what I meant, thanks so much!