Overcast, written as "OVC" in the METAR observation, is reported when the cloud cover is observed to equal eight oktas (eighths).[1][3] An overcast sky may be explicitly identified as thin (mostly transparent), but otherwise is considered opaque, which always constitutes a ceiling in aviation meteorology.[2]
Sometimes clouds can be different colors such as black or white, but overcast usually refers to darker skies.[4] In some cases, it can be impossible to see distinct borders of clouds or the sky may be covered by a single type of cloud, such as stratus, and the whole sky will be a dull white.
Periods of overcast weather can range from a few hours to several days. Overcast weather can also affect people suffering from seasonal affective disorder.
The same weather when observed from above may be referred to as undercast, generally by pilots reporting in-flight weather conditions.[5]
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overcast, other, uses, disambiguation, overcast, weather, defined, world, meteorological, organization, meteorological, condition, clouds, obscuring, least, however, total, cloud, cover, must, entirely, obscuring, phenomena, near, surface, such, completely, ov. For other uses see Overcast disambiguation Overcast or overcast weather as defined by the World Meteorological Organization is the meteorological condition of clouds obscuring at least 95 of the sky 1 However the total cloud cover must not be entirely due to obscuring phenomena near the surface such as fog 2 A completely overcast sky in Mehamn NorwayOvercast written as OVC in the METAR observation is reported when the cloud cover is observed to equal eight oktas eighths 1 3 An overcast sky may be explicitly identified as thin mostly transparent but otherwise is considered opaque which always constitutes a ceiling in aviation meteorology 2 Sometimes clouds can be different colors such as black or white but overcast usually refers to darker skies 4 In some cases it can be impossible to see distinct borders of clouds or the sky may be covered by a single type of cloud such as stratus and the whole sky will be a dull white Periods of overcast weather can range from a few hours to several days Overcast weather can also affect people suffering from seasonal affective disorder The same weather when observed from above may be referred to as undercast generally by pilots reporting in flight weather conditions 5 See also edit nbsp Wikimedia Commons has media related to Overcast nbsp Look up overcast in Wiktionary the free dictionary Diffuse reflection Forward scatter Light scattering by particles Diffuser optics Gloom June Gloom Hard and soft light Photon diffusionReferences edit a b Aerodrome Weather Report PDF World Meteorological Organization Archived from the original on 24 February 2012 Retrieved 30 August 2016 a href Template Cite web html title Template Cite web cite web a CS1 maint bot original URL status unknown link a b Overcast American Meteorological Society Retrieved 30 August 2016 World Meteorological Organization Overcast Eumetcal Archived from the original on 24 September 2016 Retrieved 30 August 2016 Oxford English Dictionary 3rd ed website s v overcast 2a and 2b http www oed com view Entry 134377 eid32922408 Accessed September 7 2016 Undercast American Meteorological Society Retrieved 30 August 2016 nbsp This cloud related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Overcast amp oldid 1100979101, wikipedia, wiki, book, books, library,
