ࡱ>  5 !"#$%&'()*+,-./012346789:Root Entry FpHM@SummaryInformation(DocumentSummaryInformation8 WordDocumentJ  Oh+'0( @ L Xdlt|Unit 1  guoyaxin Normal.dotxijijun5@rvɝ-@vMDMicrosoft Office Word ՜.+,D՜.+,t0   ( WWW.YlmF.CoM (\dlKSOProductBuildVer2052-10.1.0.58660TableData  PjKSKSJe/8$WhV G@g8 Call them twisters or tornadoes. They are nature's most violent storms with swirling winds that can top 300 miles per hour. About 800 twisters sweep through the US every year, more than anywhere else in the world. The hardest-hit area is a swath of the Great Plains from Texas to South Dakota, known as Tornado Alley. Here, warm air flows up from the Gulf of Mexico in the spring and summer and crashes into cold air pushing down from Canada. The meeting produces violent thunderstorms called supercells. Scientists don't completely understand how or when tornados form, but they do know a supercell like this one can produce a twister if the conditions are right. As more moist air flows into a storm, it gets pushed up and twisted by upper level winds. As this rotating column of air gathers force, conditions are right for a collision below. When rain cooled downdrafts hit warm air near the ground, a low hanging revolving cloud forms beneath the cell. A tornado is imminent. 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