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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 spins while in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of ...

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 ...

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 ...

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.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. "Tornado Alley is an area of ...

.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 ...
.ask.com/youtube?q=What+Is+Tornado%3F&v=-s3UwOq1P1E
Jul 15, 2015 ... Tornadoes are one of nature's most powerful forces -- see where they come from, how fast they go, and how scientists study them! ---------- Like ...

www.wunderground.com/resources/education/tornadoFAQ.asp

When the funnel cloud is half-way between the cloud base and the ground, it is called a tornado. The tornado's high-speed winds rotate about a small, relatively  ...

stormaware.mo.gov/tornado-facts-history

Learn basic tornado facts and review Missouri's tornado history.