Home > Terms > English, UK (UE) > tornado
tornado
1. A violently rotating column of air, in contact with the ground, either pendant from a cumuliform cloud or underneath a cumuliform cloud, and often (but not always) visible as a funnel cloud. When tornadoes do occur without any visible funnel cloud, debris at the surface is usually the indication of the existence of an intense circulation in contact with the ground.
On a local scale, the tornado is the most intense of all atmospheric circulations. Its vortex, typically a few hundred meters in diameter, usually rotates cyclonically (on rare occasions anticyclonically rotating tornadoes have been observed) with wind speeds as low as 18 m s−1 (40 mph) to wind speeds as high as 135 m s−1 (300 mph). Wind speeds are sometimes estimated on the basis of wind damage using the Fujita scale. Some tornadoes may also contain secondary vortices (suction vortices). Tornadoes occur on all continents but are most common in the United States, where the average number of reported tornadoes is roughly 1000 per year, with the majority of them on the central plains and in the southeastern states (see Tornado Alley). They can occur throughout the year at any time of day. In the central plains of the United States they are most frequent in spring during the late afternoon. See Also supercell tornado, nonsupercell tornado, gustnado, landspout, waterspout.
2. A violent thundersquall in West Africa and adjacent Atlantic waters.
- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Weather
- Category: Meteorology
- Company: AMS
- Product:
- Acronym-Abbreviation:
Other Languages:
Member comments
Terms in the News
Featured Terms
Basic science years
A term that usually refers to the initial two years of a medical school's program. However, in some schools, this may entail more or less than two ...
Contributor
Featured blossaries
Browers Terms By Category
- Air conditioners(327)
- Water heaters(114)
- Washing machines & dryers(69)
- Vacuum cleaners(64)
- Coffee makers(41)
- Cooking appliances(5)
Household appliances(624) Terms
- Home theatre system(386)
- Television(289)
- Amplifier(190)
- Digital camera(164)
- Digital photo frame(27)
- Radio(7)
Consumer electronics(1079) Terms
- Journalism(537)
- Newspaper(79)
- Investigative journalism(44)
News service(660) Terms
- Body language(129)
- Corporate communications(66)
- Oral communication(29)
- Technical writing(13)
- Postal communication(8)
- Written communication(6)
Communication(251) Terms
- Hair salons(194)
- Laundry facilities(15)
- Vetinary care(12)
- Death care products(3)
- Gyms(1)
- Portrait photography(1)