The height above the ground or water of the base of the lowest layer of cloud below 6,000 meters (20,000 feet) covering more than half the sky.
Source FAA Pilot/Controller Glossary · checked 2026-08-25
The height above the ground or water of the base of the lowest layer of cloud below 6,000 meters (20,000 feet) covering more than half the sky.
Source FAA Pilot/Controller Glossary · checked 2026-08-25