In this guided Web exploration you'll discover: What conditions cause tornadoes. What tornado alley is. Where tornadoes get their energy. How tornadoes are measured. How many tornadoes you get where you live.

Tornadoes still baffle scientists. They are the most feared of all storms. Twisters are deadly, fast, mysterious and unpredictable. The word "tornado" comes from the Spanish words, "tronado," meaning thunderstorm and, "tornar," meaning to turn. Yet, because of the danger involved, scientists have never directly measured the pressure and wind speed within a tornado. (University of Illinois at Urbana-Champaign). Still, scientist know a lot about tornadoes.

What conditions cause tornadoes?
http://whyfiles.news.wisc.edu/013tornado/tornado_main1.html
http:// www.usatoday.com/weather/wconvcap.htm
http://www.usatoday.com/weather/wtwist1.htm
http:// www.usatoday.com/weather/wcapform.htm
http://www.usatoday.com/weather/tornado/wtbasics.htm

What causes the strongest tornadoes to form?
http:// www.usatoday.com/weather/tg/wsupercl/wsupercl.htm
http:// www.usatoday.com/weather/wtsm2.htm

What is tornado alley?
http://whyfiles.news.wisc.edu/013tornado/tornado_main1.html

How are tornadoes measured?
http://www.weather.com/breaking_weather/encyclopedia/charts/tornado/fujita_scale.html
http://whyfiles.news.wisc.edu/013tornado/tornado_main2.html

What was the worst tornado of all time?
http://www.tornadoproject.com/ [Click on Tornado Top Tens]

Where do tornadoes get all that energy?
http://whyfiles.news.wisc.edu/013tornado/energy_source.html

What month has the greatest number of killer tornadoes?
http://www.tornadoproject.com/ [Click on Tornado Safety, then click on the graph]

What percentage of tornadoes are violent and what percentage of deaths occur as a result of the F-4 and F-5 tornadoes?
http://www.tornadoproject.com/fujitascale/fscale.htm#top

What is the greatest danger from a tornado and how can you protect yourself?
http://www.usatoday.com/weather/askjack/wfaqtsf.htm
http://whyfiles.news.wisc.edu/013tornado/protect.html

How many tornadoes do you get where you live?
http:// www.tornadoproject.com/states/states.htm#top