indefinite ceiling


Also found in: Acronyms.

indefinite ceiling

[in′def·ə·nət ′sēl·iŋ]
(meteorology)
After United States weather observing practice, the ceiling classification applied when the reported ceiling value represents the vertical visibility upward into surface-based, atmospheric phenomena (except precipitation), such as fog, blowing snow, and all of the lithometeors. Formerly known as ragged ceiling.

indefinite ceiling

As it pertains to meteorology, the ceiling classification denoting a poorly defined boundary between clouds and clear air where vertical visibility into surface-based obscuration ends.
Mentioned in ?
References in periodicals archive ?
[The pilot] declared an emergency and landed without incident." No one was hurt and aircraft damage was "minor." Winds were calm and visibility was 1/4 mile in fog with an indefinite ceiling.
The ultimate low IFR departure includes a zero-zero takeoff: essentially no horizontal visibility and an indefinite ceiling. To make it interesting, we'd also forego the possibility of climbing out to VFR on top.

Full browser ?