indefinite ceiling


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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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[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.
On a mission: LIFR departures: according to top operators, safe, regular departures in low IFR require devising a system to double-check everything and sticking to it

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