I thought you might be interested in looking at Dynamic Weather Effects Script by Engima of Östgöta Ops.
https://forums.bohemia.net/forums/topic/141788-dynamic-weather-effects-script-by-engima-of-%C3%A3%E2%80%93stg%C3%A3%C2%B6ta-ops/?do=findComment&comment=2290673
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