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

en.wikipedia.org/wiki/Tornado

A tornado near Anadarko, Oklahoma. The funnel is the thin tube reaching from the cloud to the ground. The lower part of this tornado is surrounded by a ...

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 ...

Tornado Facts & History - Storm Aware

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

A tornado appears as a rotating, funnel-shaped cloud that extends from a thunderstorm to the ground with whirling winds that can reach 300 miles per hour .

weather.about.com/od/tornadoe1/ss/tornadoes.htm
The important aspect of the definition is that the tornado or funnel cloud is in contact with the ground. While at first it would seem this is a consequence of the Coriolis effect , tornadoes are over almost as quickly as they start. In the United States, a unique com... More »
By Rachelle Oblack, About.com Guide

About Tornadoes | Weather Underground

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

A tornado is a violently rotating column of air which descends from a thunderstorm to the ground. No other weather phenomenon can match the fury and ...

What Are Tornadoes? - Definition, Causes & The Enhanced Fujita ...

study.com/academy/lesson/what-are-tornadoes-definition-causes-the-enhanced-fujita-scale.html

Tornadoes are dangerous storms that affect millions of people. In this video lesson, you will learn how and where they form, as well as how...

Severe Weather 101: Tornado Basics

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

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

Tornadoes | Ready.gov

www.ready.gov/tornadoes

Jul 14, 2015 ... Tornadoes are nature's most violent storms. Spawned from powerful thunderstorms, tornadoes can cause fatalities and devastate a ...

Fun Tornado Facts for Kids - Interesting Information about Twisters

www.sciencekids.co.nz/sciencefacts/weather/tornado.html

The Fujita Scale is a common way of measuring the strength of tornadoes. The scale ranges from F0 tornadoes that cause minimal damage through to F5 ...

Answer
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Q: What are tornadoes?
A: Far more violent than hurricanes are tornadoes. Winds surrounding tornadoes often reach speeds of 100 miles an hour, and have even reached speeds of 300 miles a... Read More »
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Q: What are tornadoes?
A: A tornado is basically a violently rotating column of air extending from a thunderstorm to the ground level. Some of the most violent tornadoes are capable of t... Read More »
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A: A tornado is a violently rotating column of air in contact with the ground. The air column may be seen when it contains condensation in the form of a cloud or s... Read More »
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