Cumulus congestus clouds, also known as towering cumulus, are a form of cumulus that can be based in the low or middle height ranges. They achieve considerable vertical development in areas of deep, moist convection. They are an intermediate stage between cumulus mediocris and cumulonimbus, sometimes producing showers of snow, rain, or ice pellets.[2] Precipitation that evaporates before reaching the surface is virga.
Cumulus congestus
An example of cumulus congestus clouds visible in the distance.
Cumulus congestus clouds are characteristic of unstable areas of the atmosphere which are undergoing convection. They are often characterized by sharp outlines and great vertical development.[1] Because they are produced by (and primarily composed of) strong updrafts, they are typically taller than they are wide, and cloud tops can reach 6 kilometres (20,000 ft),[3] or higher in the tropics.[4]
Cumulus congestus clouds are formed by the development of cumulus mediocris generally, though they can also be formed from altocumulus castellanus or stratocumulus castellanus, which are forms of cumulus castellanus.[1] The congestus species of cloud can only be found in the genus cumulus[1] and is designated as towering cumulus (TCu) by the International Civil Aviation Organization (ICAO). Congestus clouds are capable of producing severe turbulence and showers of moderate to heavy intensity. This species is classified as vertical or multi-étage and is coded CL2 in the synop report. These clouds are usually too large and opaque to have any opacity or pattern-based varieties. Congestus and especially cumulonimbus are hazardous to aviation.
An approaching weather front often brings mid level clouds such as altostratus or altocumulus which when expansive and dense reduces insolation and infringes cumulus from reaching the congestus stage. Occasionally, however, particularly if the air below the mid level cloud is very warm or unstable, some of the cumuli may become congestus and the tops of them may rise above the mid level cloud layer, sometimes resulting in showers ahead of the main rainband. This is often a sign the approaching front contains at least a few cumulonimbi amongst the nimbostratus rain clouds and therefore any rain may be accompanied by thunderstorms.[citation needed]
Cumulus congestus will mature into cumulonimbus calvus under conditions of sufficient instability. This transformation can be seen by the presence of smooth, fibrous, or striated aspects assumed by the cloud's upper part.[5] While all congestus produce showers, this development could produce heavy precipitation.[1]
A flammagenitus cloud, or pyrocumulus, (FgCu or FgCu con) is a rapidly growing convective cloud associated with volcanic eruptions and large-scale fires (typically wildfires). Pyrocumulus congestus may thus form under those special circumstances that can also cause severe turbulence.
Cumulus congestus can also be associated with fair weather waterspouts forming from rotation at the open water surface being stretched and tightened under their updraft.[6]Landspouts most often form under congestus, as well. Both of these non-mesocyclone associated tornadoes typically dissipate when a more pronounced precipitation shaft forms and the downdraft cuts off this process. In highly sheared environments or within the flanking line of a supercell congestus can rotate and on rare occasions produce mesocyclonic type tornadoes, with waterspouts and landspouts emanating from misocyclones, a related but distinct process.
Turkey toweredit
An example of a Turkey tower in the distance
Turkey tower is a slang term for a narrow, tall, individual towering cloud from a small cumulus cloud which develops and suddenly falls apart.[7] Sudden development of turkey towers could signify the breaking or weakening of a capping inversion,[8] and an area where these consistently form is an "agitated area", a term that applies to congestus generally.
Wikimedia Commons has media related to Cumulus congestus clouds.
American Meteorological Society - Glossary of Meteorology
Referencesedit
^ abcde"Cumulus Congestus". Glossary of Meteorology. American Meteorological Society. Retrieved 2021-04-16.
^"Learn About Cumulus Congestus Clouds". whatsthiscloud. Retrieved 2021-03-22.
^See "Life Cycle of a Thunderstorm". JetStream - Online School for Weather. National Weather Service. Retrieved 2021-04-16.
^Richard H. Johnson; Thomas M. Rickenbach; Steven A. Rutledge; Paul E. Ciesielski; Wayne H. Schubert (1999). "Trimodal Characteristics of Tropical Convection". Journal of Climate. 12 (8): 2397–2418. Bibcode:1999JCli...12.2397J. CiteSeerX10.1.1.406.1226. doi:10.1175/1520-0442(1999)012<2397:tcotc>2.0.co;2.
^Courtier, Benjamin M.; T. H. M. Stein; R. G. Harrison; K. E. Hanley; J. M. Wilkinson (2019). "Intensification of single cell storms prior to lightning onset". Atmos Sci Lett. 20 (e873): e873. doi:10.1002/asl.873.
^"Weather Glossary - T". The Weather Company. Weatherzone. Retrieved 2009-02-21.
^"National Weather Service Glossary". National Oceanic and Atmospheric Administration. Central Region Headquarters. Retrieved 2009-02-21.
January 08, 2024
cumulus, congestus, cloud, also, known, towering, cumulus, form, cumulus, that, based, middle, height, ranges, they, achieve, considerable, vertical, development, areas, deep, moist, convection, they, intermediate, stage, between, cumulus, mediocris, cumulonim. Cumulus congestus clouds also known as towering cumulus are a form of cumulus that can be based in the low or middle height ranges They achieve considerable vertical development in areas of deep moist convection They are an intermediate stage between cumulus mediocris and cumulonimbus sometimes producing showers of snow rain or ice pellets 2 Precipitation that evaporates before reaching the surface is virga Cumulus congestusAn example of cumulus congestus clouds visible in the distance AbbreviationCu conSymbolGenusCumulus heaped SpeciesCongestus Piled up VarietyRadiatuseAltitudeUp to 6 000 m Up to 20 000 ft ClassificationFamily D Vertically developed AppearanceLow altitude vertical taller than it is wide fluffy heaps of clouds with cotton like appearance PrecipitationRain Snow or Snow pellets 1 Contents 1 Description 2 Turkey tower 3 See also 3 1 Bibliography 4 ReferencesDescription edit nbsp Cumulus congestus over Cahokia Mounds Museum Collinsville IllinoisCumulus congestus clouds are characteristic of unstable areas of the atmosphere which are undergoing convection They are often characterized by sharp outlines and great vertical development 1 Because they are produced by and primarily composed of strong updrafts they are typically taller than they are wide and cloud tops can reach 6 kilometres 20 000 ft 3 or higher in the tropics 4 Cumulus congestus clouds are formed by the development of cumulus mediocris generally though they can also be formed from altocumulus castellanus or stratocumulus castellanus which are forms of cumulus castellanus 1 The congestus species of cloud can only be found in the genus cumulus 1 and is designated as towering cumulus TCu by the International Civil Aviation Organization ICAO Congestus clouds are capable of producing severe turbulence and showers of moderate to heavy intensity This species is classified as vertical or multi etage and is coded CL2 in the synop report These clouds are usually too large and opaque to have any opacity or pattern based varieties Congestus and especially cumulonimbus are hazardous to aviation An approaching weather front often brings mid level clouds such as altostratus or altocumulus which when expansive and dense reduces insolation and infringes cumulus from reaching the congestus stage Occasionally however particularly if the air below the mid level cloud is very warm or unstable some of the cumuli may become congestus and the tops of them may rise above the mid level cloud layer sometimes resulting in showers ahead of the main rainband This is often a sign the approaching front contains at least a few cumulonimbi amongst the nimbostratus rain clouds and therefore any rain may be accompanied by thunderstorms citation needed Cumulus congestus will mature into cumulonimbus calvus under conditions of sufficient instability This transformation can be seen by the presence of smooth fibrous or striated aspects assumed by the cloud s upper part 5 While all congestus produce showers this development could produce heavy precipitation 1 A flammagenitus cloud or pyrocumulus FgCu or FgCu con is a rapidly growing convective cloud associated with volcanic eruptions and large scale fires typically wildfires Pyrocumulus congestus may thus form under those special circumstances that can also cause severe turbulence Cumulus congestus can also be associated with fair weather waterspouts forming from rotation at the open water surface being stretched and tightened under their updraft 6 Landspouts most often form under congestus as well Both of these non mesocyclone associated tornadoes typically dissipate when a more pronounced precipitation shaft forms and the downdraft cuts off this process In highly sheared environments or within the flanking line of a supercell congestus can rotate and on rare occasions produce mesocyclonic type tornadoes with waterspouts and landspouts emanating from misocyclones a related but distinct process Turkey tower edit nbsp An example of a Turkey tower in the distanceTurkey tower is a slang term for a narrow tall individual towering cloud from a small cumulus cloud which develops and suddenly falls apart 7 Sudden development of turkey towers could signify the breaking or weakening of a capping inversion 8 and an area where these consistently form is an agitated area a term that applies to congestus generally nbsp Wikimedia Commons has media related to Cumulus congestus clouds See also editAtmospheric thermodynamics Convective instability Cumulus castellanus cloud PileusBibliography edit American Meteorological Society Glossary of MeteorologyReferences edit a b c d e Cumulus Congestus Glossary of Meteorology American Meteorological Society Retrieved 2021 04 16 Learn About Cumulus Congestus Clouds whatsthiscloud Retrieved 2021 03 22 See Life Cycle of a Thunderstorm JetStream Online School for Weather National Weather Service Retrieved 2021 04 16 Richard H Johnson Thomas M Rickenbach Steven A Rutledge Paul E Ciesielski Wayne H Schubert 1999 Trimodal Characteristics of Tropical Convection Journal of Climate 12 8 2397 2418 Bibcode 1999JCli 12 2397J CiteSeerX 10 1 1 406 1226 doi 10 1175 1520 0442 1999 012 lt 2397 tcotc gt 2 0 co 2 Courtier Benjamin M T H M Stein R G Harrison K E Hanley J M Wilkinson 2019 Intensification of single cell storms prior to lightning onset Atmos Sci Lett 20 e873 e873 doi 10 1002 asl 873 What is a waterspout National Ocean Service NOAA Retrieved 2021 04 15 Weather Glossary T The Weather Company Weatherzone Retrieved 2009 02 21 National Weather Service Glossary National Oceanic and Atmospheric Administration Central Region Headquarters Retrieved 2009 02 21 Retrieved from https en wikipedia org w index php title Cumulus congestus cloud amp oldid 1170372073, wikipedia, wiki, book, books, library,
