References: 1. Federal Storm Prediction Center 2. VORTEX2 planning documents; Jeff Martin, "Tornado Hunters roam the plains," USA Today, 5-19-09, p. 3A 3. National Science Foundation; USA Today, 4-14-08, p. 8A) 4. National Weather Service Storm Prediction Center 5. Scientific American, "Hurricane Hubbub," August 2008, Vol. 299(2):34 6. Science News, "Science stats: death from natural hazards," Vol. 175 (2)-: 4, January 17, 2009 7. Discovery, "Raging Planet: Hurricanes," 8-16-09 8. Discovery, "Raging Planet: Floods," 8-16-09 9. Discovery, "Raging Planet: Tornadoes," 8-16-09
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