Are cloud heights reported in AGL or MSL?

Cloud heights are typically reported in terms of AGL (Above Ground Level). This measurement refers to the altitude of the cloud base in relation to the ground below it at a specific location, which is crucial for pilots and meteorologists when assessing weather conditions, flight safety, and navigation.

When clouds are reported in AGL, it helps in understanding how high they are from the ground, which can vary based on the topography of the area. For example, if a cloud is reported at 1,000 feet AGL, it means that the base of that cloud is 1,000 feet above the ground at that particular spot, making it a very relevant measurement for aviation purposes.

While MSL (Mean Sea Level) measurements are often used in aviation for altitude and terrain elevation reference, cloud heights are specifically communicated in AGL to give a clearer understanding of their position relative to the surface, as ground level can fluctuate with various geographical features.

As such, the option stating that cloud heights are reported only in AGL accurately reflects standard meteorological practices and is essential for understanding the implications of cloud coverage for flight operations.