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www.weatherquestions.com/What_causes_tornadoes.htm

Brief, simplified description of how tornadoes form. ... This is the same process that causes an ice skater to spin faster when she pulls her arms in toward her ...

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 ... To form a tornado, the host thunderstorm must also rotate. From below, a rotating cloud base looks like someone is stirring the storm from ...

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 ...

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.weatherwizkids.com/weather-tornado.htm

Tornado How do tornadoes form? Most tornadoes form from thunderstorms. ... widely recognized as tornadoes, they can cause comparable, and in some cases,  ...

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

The truth is that scientists don't fully understand how tornadoes form. ... and the surrounding winds may cause the updraft to begin rotating-and a tornado is born.

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

A tornado can form where winds blow at different speeds causing rotation (A) which can tighten ... Rain and hail can cause the funnel to bend downward (C).

people.uwec.edu/jolhm/EH/Barnier/tornado.htm

The first thing that is needed to produce a tornado is a thunderstorm. ... This happens when the moisture in the air turns into water droplets and forms clouds. ... of a tornado forming are very likely since this is the main force which causes the ...