2. The shortest and most destructive storms…

3. Tornadoes have, at one point one or another, occurred in all 50 states Tornadoes are the most violent storms on Earth About 1,000 tornadoes spin up beneath thunder storms every year About 60 people die from tornadoes each year in the United States Tornadoes have speeds of up to 300 mph. The typical tornado lasts about 8 minutes More violent tornadoes can go on for hours Did You Know…….

4. Tornado Formation 1.Before a thunderstorm develops, a difference in wind direction with increasing height creates an invisible, horizontally spinning effect in lower atmospheres. 2.Rising air in the thunderstorm updrafts tilt the rotating air column from left and right to up and down. 3.An area of rotation 2-6 miles wide extends through most of the storm. Most have the strong and violent storms form in this area of strong rotation.

5. F0 F1 F2 F3 F4 F5 Light Damage. Some damage to chimneys; branches broken off trees; shallow-rooted trees pushed over; sign boards damaged. Moderate Damage. Peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos blown off roads. Considerable Damage. Roofs torn off frame houses; mobile homes demolished; boxcars overturned; large trees snapped or uprooted; light-object missiles generated; cars lifted off ground. Severe Damage. Roofs and some walls torn off well- constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off the ground and thrown. Devastating Damage. Well-constructed houses leveled; structures with weak foundations blown away some distance; cars thrown and large missiles generated. Incredible Damage. Strong frame houses leveled off foundations and swept away; automobile-sized missiles fly through the air in excess of 100 meters (109 yds); trees debarked; incredible phenomena will occur. The Fujita Scale

6. The Tornado Alley is the place in central America where tornadoes most occur

7. http://www.spc.noaa.gov/faq/tornado/f-scale.html http://www.weatherwizkids.com/tornado.htm http://www.chaseday.com/tornadoes.htm http://www.climateandweather.net/world_weathe r/tornados.htmhttp://www.climateandweather.net/world_weathe r/tornados.htm http://www.britannica.com http://library.thinkquest.org/04oct/00996/Theresa /index.htm Bibliography