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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 ... However, the vast majority of tornadoes occur in the Tornado Alley region of the United States, although they can occur nearly ..... The convergence of warm air in the updraft and cool air causes a rotating wall cloud to form.

www.weatherquestions.com/What_causes_tornadoes.htm

Brief, simplified description of how tornadoes form. ... direction (in the Northern Hemisphere), converges inward toward the thunderstorm, causing it to spin faster .

www.livescience.com/21498-tornado-facts.html

Apr 19, 2016 ... Tornadoes are violent storms that kill 80 people each year. Here are some facts about how they form and how to stay safe.

wxguys.ssec.wisc.edu/2011/05/01/what-causes-tornadoes

May 1, 2011 ... The winds inside a tornado spiral inward and upward, often exceeding speeds of ... To form a tornado, the host thunderstorm must also rotate.

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

Because wind is invisible, it is hard to see a tornado unless it forms a .... The rear flank downdraft is the motion in the storm that causes the hook echo feature on ...

www.thoughtco.com/how-tornadoes-form-3444287

Feb 4, 2016 ... Tornadoes and the formation of tornadoes are a popular severe weather topic. Learn what causes a tornado or twister, and the role of severe ...

people.uwec.edu/jolhm/eh/barnier/tornado.htm

The warm air rises from the lower atmosphere causing an updraft, which mixes ... This sheering action of the three air masses colliding forms the tornado in the ...

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

May 11, 2015 ... How Tornadoes Form and Why They're so Unpredictable ... This happens when air descending from the supercell causes rotation near the ...

scied.ucar.edu/shortcontent/how-tornadoes-form

A tornado can form where winds blow at different speeds causing rotation (A) which can tighten and speed into a funnel cloud if caught in the flow of air moving  ...