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.
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