Question: are ceilings msl or agl?
Answer: Clouds are always reported by weather stations in feet above ground level (AGL). ... Example: At Grand Forks International Airport (KGFK), clouds are reported broken at 7,000 feet AGL. Add the reported clouds of 7,000 feet AGL to the field elevation of 845 feet MSL to get a cloud base altitude of 7,845 feet MSL.