Are cloud heights reported in AGL or MSL?

Cloud heights are typically reported in height above mean sea level (MSL). This standard is adopted in aviation and meteorology to provide a consistent reference point for understanding cloud altitudes. Reporting cloud heights in MSL ensures that all pilots and meteorologists are considering the same baseline, which is crucial for flight safety and weather prediction.

Choosing height above ground level (AGL) as the answer may be confusing because while AGL measurements are important in certain contexts, cloud heights specifically relate to an absolute elevation above sea level, not the height relative to the ground beneath the clouds. This means cloud heights can vary significantly depending on the elevation of the terrain where measurements are taken.

Thus, accurate communication about cloud heights in aviation relies on the use of MSL, allowing for consistent reporting across different geographical areas, accounting for variations in topography.