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waterspout
- Definição1
- In general, a tornado occurring over water. Specifically, it normally refers to a small, relatively weak rotating column of air over water beneath a Cb or towering cumulus cloud. Waterspouts are most common over tropical or subtropical waters.
- Fonte1
- UNITED STATES. National Weather Service. National weather service glossary. [20-?]. In: ______. [Homepage]. [Silver Spring, MD, 20-?]. Disponível em: < https://forecast.weather.gov/glossary.php >. Acesso em: 11 dez. 2019.
- Fonte2
- AMERICAN METEOROLOGICAL SOCIETY. Glossary of meteorology. [S.l., última modificação 05 oct. 2015]. Disponível em: < http://glossary.ametsoc.org/wiki/Main_Page >. Acesso em: 11 dez. 2019.
- Nota Adicional1
- The exact definition of waterspout is debatable. In most cases the term is reserved for small vortices over water that are not associated with storm-scale rotation (i.e., they are the water-based equivalent of landspouts). But there is sufficient justification for calling virtually any rotating column of air a waterspout if it is in contact with a water surface.
- Nota Adicional2
- Waterspouts exhibit a five- stage, discrete life cycle observable from aircraft: 1) dark-spot stage; 2) spiral pattern stage; 3) spray-ring stage; 4) mature or spray-vortex stage; and 5) decay stage. Waterspouts occur most frequently in the subtropics during the warm season; more are reported in the lower Florida Keys than in any other place in the world. Funnel diameters range from a few up to 100 m or more; lifetimes average 5–10 minutes, but large waterspouts can persist for up to one hour.
- Contexto
- Heavy used to indicate tornado or waterspout; moderate (no qualifier) to indicate funnel cloud not reaching the ground.
- A well-developed funnel cloud is considered a tornado when over ground, and a waterspout when over water.
- Subárea
- Aeronautical Meteorology
- Français
- trombe marine