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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.spc.noaa.gov/faq/tornado

May 1, 2017 ... The Tornado FAQ is not intended to be a comprehensive guide to tornadoes. Instead, it is a quick-reference summary of tornado knowledge, ...

.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, ...

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 ...

.ask.com/youtube?q=Tornadoes&v=bjb7QtMEBUg
May 7, 2016 ... SEE ALSO: 360 Video! https://www.youtube.com/watch?v=TCXp9Y5uPn4 E xtreme up-close footage of tornado just north of Wray, CO earlier ...
.ask.com/youtube?q=Tornadoes&v=bJPGuMfnty4
Dec 27, 2012 ... Security Video Shows Tornado Hitting School Cameras inside a school have give an inside look at the power of a tornado.

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

Mar 21, 2017 ... Two dozen people have lost their lives from tornadoes so far this year, and the waves of severe weather have contributed to economic losses of ...

kids.nationalgeographic.com/explore/science/tornado

Tornadoes demolish houses, flip cars, cross rivers, dig 3 foot (0.9 meter) trenches , and lift lightweight objects 10,000 feet (3048 meters) into the air. A tornado is ...