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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.

Tornado - Wikipedia

en.wikipedia.org/wiki/Tornado

A tornado is a violently 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 ...

Tornadoes - Weather Wiz Kids weather information for kids

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 ...

What is a tornado? - eSchooltoday

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 ...

What causes tornadoes?

www.weatherquestions.com/What_causes_tornadoes.htm

Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability and (2) wind shear present in the lower atmosphere. Instability refers to  ...

www.ask.com/youtube?q=What A Tornado&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 ...

Severe Weather 101: Tornado Basics

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

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

Tornadoes 101 - National Geographic

video.nationalgeographic.com/video/101-videos/tornadoes-101

Tornadoes, nearly three-quarters of which occur within the U.S., are unpredictable and can cause massive damage. New tools and data are helping scientists ...

Tornado Facts and History - StormAware

stormaware.mo.gov/tornado-facts-history/

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

Tornadoes | Ready.gov

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.