True if a high cloud layer is active. Boolean. Read-only.
Note: All weather variables report the weather in the aircraft's current location. This weather information only reflects the weather defined by the weather commands if the aircraft is in the area defined by the Weather and Weather_Char commands.
Example
IF CLOUD_HIGH_ACTIVE = TRUE THEN
IF CLOUD_HIGH_TYPE = 1 THEN
PRINT "Not much chance of ice with cirrus clouds."
ENDIF
ENDIF