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| | | #REDIRECT [[Ceiling]] |
| #REDIRECT [[ceiling]] | |
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| <div class="termentry">
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| == ceiling ==
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| #<div class="definition"><div class="short_definition">After U.S. weather observing practice, the height ascribed to the lowest layer of [[clouds]] or obscuring phenomena when it is reported as [[broken]], [[overcast]], or [[obscuration]] and not classified "[[thin]]" or "[[partial]]." The ceiling is termed unlimited when the foregoing conditions are not satisfied. Whenever the height of a [[cirriform]] cloud layer is unknown, a slant / is reported in lieu of a height value. At all other times, the ceiling is expressed in feet above the surface, which is a horizontal plane with an [[elevation]] above [[sea level]] equal to the [[airport elevation]]. At stations where this does not apply, "surface" refers to the ground elevation at the point of [[observation]].</div><br/> <div class="paragraph">For obscurations, the ceiling height represents [[vertical visibility]] into the obscuring phenomena rather than the height of the base, as in the case of clouds or obscuring phenomena aloft. In an [[aviation weather observation]], the ceiling height is always preceded by a letter that designates the [[ceiling classification]].</div><br/> </div>
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| #<div class="definition"><div class="short_definition">The greatest [[altitude]] to which an airborne object (aircraft, [[balloon]], [[rocket]], projectile, etc.) can rise, under a given set of conditions.</div><br/> <div class="paragraph">The ceiling of an aircraft is that altitude where the [[stalling Mach number]] and the buffeting [[Mach number]] approach identical value.</div><br/> </div>
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| [[Category:Terms_C]]
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