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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.ask.com/youtube?q=What+Is+Tornado%3F&v=wlwyA-5iafg
Jan 2, 2013 ... Science expert Emerald Robinson explains what a tornado is and how it forms.To view over 15000 other how-to, DIY, and advice videos on any ...

www.nssl.noaa.gov/education/svrwx101/tornadoes

Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. Tornadoes are the most ...

www.accuweather.com/en/weather-news/what-is-tornado-alley/70001107

The most frequent and devastating tornado events tend to occur in the region of the U.S. colloquially referred to as Tornado Alley.

eschooltoday.com/natural-disasters/tornadoes/what-is-a-tornado.html

Tornadoes are violent storms that appear as a powerful rotating mixture of wind and thunderstorm clouds, extending from the clouds to the ground in a funnel ...

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 ...

earth.rice.edu/mtpe/atmo/atmosphere/topics/tornado.html

A tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable of tremendous ...

www.whathappensnow.com/articles_show.cfm?id=92&cat=8&sub=1

A tornado is a violent windstorm characterized by a twisting, funnel-shaped cloud . It is spawned by a thunderstorm (or sometimes as a result of a hurricane) and ...

www.livescience.com/21498-tornado-facts.html

Apr 19, 2016 ... A large tornado touches down near Dallas on April 3, 2012. Credit: Brandon Sullivan - StormChasingVideo.com/TornadoTitans. Tornadoes are ...