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
Contributor
Featured blossaries
Lidia Cámara
0
Terms
2
Blossaries
0
Followers
Collaborative Lexicography
Marouane937
0
Terms
58
Blossaries
3
Followers
The World's Highest-Paid DJs 2013
Browers Terms By Category
- Dating(35)
- Romantic love(13)
- Platonic love(2)
- Family love(1)
Love(51) Terms
- Marketing communications(549)
- Online advertising(216)
- Billboard advertising(152)
- Television advertising(72)
- Radio advertising(57)
- New media advertising(40)
Advertising(1107) Terms
- Nightclub terms(32)
- Bar terms(31)
Bars & nightclubs(63) Terms
- Satellites(455)
- Space flight(332)
- Control systems(178)
- Space shuttle(72)