// mando_storm.sqs v1.0
// by Mandoble
//
// Purpose:
// Forms up a storm
//
// What do you need:
// trueno1,trueno2,trueno3,trueno4,viento1 ogg files in your mission's Sound folder and in description.ext
//
// Parameters:
// Storm overcast level (0.0 to 1.0)
// Storm rain level (0.0 to 1.0)
// Storm fog level (0.0 to 1.0)
// Seconds to wait before storm starts
// Seconds to wait after strom ends (original overcast, rain and fog levels will be set along this time)
// Storm duration in seconds (you may use a big number and stop the storm whem needed setting mando_storm = false
// Lightning colour [R, G, B]
//
// Example for a storm forming up in 1 minute, lasting 30 minutes and disipating in 5 minutes:
//
// [1, 1, 1, 60, 1800, 300, [1,1,1]] execVM "mando_storm.sqf"
//
EDIT:
Updated to v1.1, now with visible thunderbolts.