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A tornado is a violently rotating column of air extending from a thunderstorm to the ground. Tornadoes in the US occur most frequently in spring and summer.
The strongest tornadoes have rotating winds of more than 250 mph. Damage can include roof removal or complete destruction of buildings, uprooted trees, and can be life-threatening as a result.

en.wikipedia.org/wiki/Tornado

A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus ...

www.ready.gov/tornadoes

Tornadoes are nature's most violent storms. Spawned from powerful thunderstorms, tornadoes can cause fatalities and devastate a neighborhood in seconds.

www.srh.noaa.gov/jetstream/tstorms/tornado.html

A tornado is a violently rotating (usually counterclockwise in the northern hemisphere) column of air descending from a thunderstorm and in contact with the ...

video.nationalgeographic.com/video/101-videos/tornadoes-101

Tornadoes, nearly three-quarters of which occur within the U.S., are unpredictable and can cause massive damage. New tools and data are helping scientists ...

www.spc.noaa.gov/faq/tornado

The Tornado FAQ is not intended to be a comprehensive guide to tornadoes. Instead ... At what wind speed of the cloud-to-ground vortex does a tornado begin ?

www.nationalgeographic.com/environment/natural-disasters/tornadoes

A rare mother ship cloud formation hovers over Childress, Texas. Tornado chasers there spent seven hours and 150 miles (240 kilometers) tracking the ...

.ask.com/youtube?q=Tornadoes&v=oWIx3Erswh8
Nov 2, 2016 ... Top 10 best tornado video countdown. Tornadoes manifest themselves in all sorts of shapes and sizes. Some are a wondrous bright white, ...

weather.com/storms/tornado/news/tornadoes-january-february-march-2017-fast-start

Mar 21, 2017 ... A series of outbreaks that began in January has propelled the preliminary 2017 U.S. tornado count to its highest level for mid-March in nearly a ...

www.weatherwizkids.com/weather-tornado.htm

Tornadoes What is a tornado? A tornado is a violent rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable ...