Difference between revisions of "Indefinite ceiling"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">(Formerly called ragged ceiling.) After U.S. weather observing practice, the [[ceiling  classification]] applied when the reported [[ceiling]] value represents the [[vertical visibility]] upward  into surface-based atmospheric phenomena (except [[precipitation]]).</div><br/> <div class="paragraph">Such phenomena include [[fog]], [[blowing snow]], and all of the [[lithometeors]]. All indefinite ceilings  are estimations, but one of the following must be used as a guide: 1) the distance an [[observer]]  can see vertically into the obstruction; 2) the height corresponding to the top of a ceiling-light  [[beam]]; 3) the height at which a [[ceiling balloon]] completely disappears; 4) the height determined  by the [[sensor]] algorithm at automated stations. The letters "VV" (vertical visibility) are used to  designate an indefinite ceiling.</div><br/> </div>
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<div class="definition"><div class="short_definition">(Formerly called ragged ceiling.) After U.S. weather observing practice, the [[ceiling classification|ceiling  classification]] applied when the reported [[ceiling]] value represents the [[vertical visibility]] upward  into surface-based atmospheric phenomena (except [[precipitation]]).</div><br/> <div class="paragraph">Such phenomena include [[fog]], [[blowing snow]], and all of the [[lithometeors]]. All indefinite ceilings  are estimations, but one of the following must be used as a guide: 1) the distance an [[observer]]  can see vertically into the obstruction; 2) the height corresponding to the top of a ceiling-light  [[beam]]; 3) the height at which a [[ceiling balloon]] completely disappears; 4) the height determined  by the [[sensor]] algorithm at automated stations. The letters "VV" (vertical visibility) are used to  designate an indefinite ceiling.</div><br/> </div>
 
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Latest revision as of 17:12, 25 April 2012



indefinite ceiling

(Formerly called ragged ceiling.) After U.S. 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 phenomena include fog, blowing snow, and all of the lithometeors. All indefinite ceilings are estimations, but one of the following must be used as a guide: 1) the distance an observer can see vertically into the obstruction; 2) the height corresponding to the top of a ceiling-light beam; 3) the height at which a ceiling balloon completely disappears; 4) the height determined by the sensor algorithm at automated stations. The letters "VV" (vertical visibility) are used to designate an indefinite ceiling.