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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.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 ...

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

tornado-vortex. What is a tornado How tornadoes form levels of tornadoes Effects of tornadoes During a tornado Tornado safety tips Tornado-tips. OTHER ...

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 ...

.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.accuweather.com/en/weather-news/the-difference-between-tornado-1/61817

There is a distinct difference between a watch and a warning, and knowing the difference can save your life.

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.

www.cnn.com/videos/weather/2017/04/05/what-is-tornado-watch-warning-jpm-orig-mobile.cnn

Apr 5, 2017 ... CNN's Jennifer Gray explains the difference between a tornado watch and a tornado warning.

newsela.com/articles/govt-NOAA-tornadoes/id/26792

TOP: A category F5 tornado, upgraded from initial estimate of F4, viewed from the southeast as it approached Elie, Manitoba, on June 22, 2007. Photo by: Justin ...