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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 ...

stormaware.mo.gov/tornado-facts-history

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

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.weatherwizkids.com/?page_id=60

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 of ...

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

Basic information about tornadoes, from the NOAA National Severe Storms Laboratory.

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 ...

news.nationalgeographic.com/2015/05/150511-tornadoes-storms-midwest-weather-science

May 11, 2015 ... A tornado lowers to the ground near Chickasha, Oklahoma, on May 6. May and June tend to have more tornadoes than any other months in ...

www.dosomething.org/us/facts/11-facts-about-tornadoes

Twisters strike predominantly along Tornado Alley – a flat stretch of land from west Texas to North Dakota.

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

No other weather phenomenon can match the fury and destructive power of tornadoes. Tornadoes can be strong enough to destroy large buildings, leaving only ...