Apr_27_2010_Tornadoes_compass - Tornadoes! A rapidly...

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Tornadoes! A rapidly rotating column of air attached to a t-storm and in contact with the ground. - not in contact with the ground = funnel cloud Time Wind Speed % of Deaths % of Tornadoes Width Weak Few min. <120 mph 5% 85% 100ft Strong Several min to an hour 120-200 mph 25% 13% Up to ¼ mile Violent Several min to an hour+ >200 mph 70% 2% Up to 1 mile Average Tornado: Size: 150 ft to 0.5 mile in diameter Time on Ground: 10 minutes (tracks 4 miles) Wind Speed: 110 mph EF-Scale Rank: EF -0 to EF -1 Direction of Movement: SW to NE @20-40 mph Average Warning Time: 13 minutes Debris is the #1 killer
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Tornado Losses 0 500 1000 1500 2000 2500 1995 1996 1997 1998 1999 2000 2001 2002 2003 (Millions $) 60 deaths per year $1.1 billion/year
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SPC Tornado Reports 2008 – near record year! Statistics For 2008 2008 126 Deaths 1690 Tornadoes 3-year Avg (2005-2007) 91 Deaths 1297 Tornadoes
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Tornado Alley:
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Apr_27_2010_Tornadoes_compass - Tornadoes! A rapidly...

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