cloud base
EASA defines “cloud base” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.
‘cloud base’ means the height of the base of the lowest observed or forecast cloud element in the vicinity of an aerodrome or operating site or within a specified area of operations, normally measured above aerodrome elevation or, in the case of offshore operations, above mean sea level;
Defined in the same article
Ask Metis where cloud base applies to you →
Metis opens with Avioverse in October 2026 · request early access.