Cumulonimbus and aviation (original) (raw)
Numerous accidents have occurred in the vicinity of thunderstorms due to the density of clouds. It is often said that the turbulence can be extreme enough inside a cumulonimbus to tear an aircraft into pieces, and even strong enough to hold a skydiver. However, this kind of accident is relatively rare. Moreover, the turbulence under a thunderstorm can be non-existent and is usually no more than moderate. Most thunderstorm-related crashes occur due to a stall close to the ground when the pilot gets caught by surprise by a thunderstorm-induced wind shift. Moreover, aircraft damage caused by thunderstorms is rarely in the form of structural failure due to turbulence but is typically less severe and the consequence of secondary effects of thunderstorms (e.g., denting by hail or paint removal b
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| dbo:abstract | Numerous accidents have occurred in the vicinity of thunderstorms due to the density of clouds. It is often said that the turbulence can be extreme enough inside a cumulonimbus to tear an aircraft into pieces, and even strong enough to hold a skydiver. However, this kind of accident is relatively rare. Moreover, the turbulence under a thunderstorm can be non-existent and is usually no more than moderate. Most thunderstorm-related crashes occur due to a stall close to the ground when the pilot gets caught by surprise by a thunderstorm-induced wind shift. Moreover, aircraft damage caused by thunderstorms is rarely in the form of structural failure due to turbulence but is typically less severe and the consequence of secondary effects of thunderstorms (e.g., denting by hail or paint removal by high-speed flight in torrential rain). Thus, cumulonimbus are known to be extremely dangerous to air traffic, and it is recommended to avoid them as much as possible. Cumulonimbus can be extremely insidious, and an inattentive pilot can end up in a very dangerous situation while flying in apparently very calm air. While there is a gradation with respect to thunderstorm severity, there is little quantitative difference between a significant shower generated by a cumulus congestus and a small thunderstorm with a few thunderclaps associated with a small cumulonimbus. For this reason, a glider pilot could exploit the rising air under a thunderstorm without recognising the situation – thinking instead that the rising air was due to a more benign variety of cumulus. However, forecasting thunderstorm severity is an inexact science; in numerous occasions, pilots got trapped by underestimating the severity of a thunderstorm that suddenly strengthened. (en) De nombreux accidents aériens se sont produits à proximité des orages. Il est souvent dit que la turbulence peut être extrême à l'intérieur d'un cumulonimbus et déchiqueter un aéronef. Cependant ce type d'accident est relativement rare. En général la turbulence sous un orage peut être assez faible voire nulle. En pratique, la plupart des crashs se produisent près du sol lorsqu'un pilote se fait surprendre par des sautes de vent qui provoquent un décrochage. En général, les accidents liés aux orages n'impliquent pas une rupture de l'aéronef mais sont la conséquence d'effets secondaires des orages, par exemple un avion cabossé par la grêle ou dont la peinture a été « nettoyée » (par abrasion) par une pluie diluvienne. Ainsi, les cumulonimbus sont réputés extrêmement dangereux pour la navigation aérienne et il est recommandé de les éviter autant que possible. Ils peuvent être extrêmement sournois et un pilote inattentif peut se retrouver dans une situation très dangereuse tout en volant dans un air absolument calme en apparence. Malgré tout, il existe une gradation au niveau de la sévérité des orages. Il y a peu de différence quantitative entre une méchante averse engendrée par un cumulus congestus et un petit orage avec 3 coups de tonnerre engendré par un petit cumulonimbus. C'est la raison pour laquelle les pilotes de planeur ont pu exploiter des orages. Cependant, la prévision de la sévérité d'un orage n'est pas une science exacte et il existe de nombreux cas où les pilotes se sont fait piéger en sous-estimant la violence de l'orage, qui s'est brutalement renforcé. (fr) |
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| dbp:cs1Dates | ly (en) |
| dbp:date | December 2020 (en) |
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| dcterms:subject | dbc:Severe_weather_and_convection dbc:Weather_hazards_to_aircraft dbc:Gliding dbc:Aeronautics |
| rdfs:comment | Numerous accidents have occurred in the vicinity of thunderstorms due to the density of clouds. It is often said that the turbulence can be extreme enough inside a cumulonimbus to tear an aircraft into pieces, and even strong enough to hold a skydiver. However, this kind of accident is relatively rare. Moreover, the turbulence under a thunderstorm can be non-existent and is usually no more than moderate. Most thunderstorm-related crashes occur due to a stall close to the ground when the pilot gets caught by surprise by a thunderstorm-induced wind shift. Moreover, aircraft damage caused by thunderstorms is rarely in the form of structural failure due to turbulence but is typically less severe and the consequence of secondary effects of thunderstorms (e.g., denting by hail or paint removal b (en) De nombreux accidents aériens se sont produits à proximité des orages. Il est souvent dit que la turbulence peut être extrême à l'intérieur d'un cumulonimbus et déchiqueter un aéronef. Cependant ce type d'accident est relativement rare. En général la turbulence sous un orage peut être assez faible voire nulle. En pratique, la plupart des crashs se produisent près du sol lorsqu'un pilote se fait surprendre par des sautes de vent qui provoquent un décrochage. En général, les accidents liés aux orages n'impliquent pas une rupture de l'aéronef mais sont la conséquence d'effets secondaires des orages, par exemple un avion cabossé par la grêle ou dont la peinture a été « nettoyée » (par abrasion) par une pluie diluvienne. (fr) |
| rdfs:label | Cumulonimbus and aviation (en) Cumulonimbus et aviation (fr) |
| owl:sameAs | wikidata:Cumulonimbus and aviation dbpedia-fr:Cumulonimbus and aviation https://global.dbpedia.org/id/2nigS |
| prov:wasDerivedFrom | wikipedia-en:Cumulonimbus_and_aviation?oldid=1117628895&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/May_20,_2013_Moore,_Oklahoma_tornado.jpg wiki-commons:Special:FilePath/Shelfcloud.jpg wiki-commons:Special:FilePath/Front_d'orage_violent.jpg wiki-commons:Special:FilePath/Micro-rafale.png wiki-commons:Special:FilePath/Supercell-cumulonimbus.jpg |
| foaf:isPrimaryTopicOf | wikipedia-en:Cumulonimbus_and_aviation |
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