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Nature in the U.S.A.
- 1. Nature in the USA
- 11. The Climate
- 14. TORNADOES - The great Plains and Midwest, because of the contrasting air masses, have frequent severe thunderstorms and tornado outbreaks during spring and summer. - In central portions of the U.S., tornadoes are more common than anywhere else on Earth and touch down most commonly in the spring and summer. - The strip of land from north Texas north to Nebraska and east into Southern Michigan is known as Tornado Alley, where many houses have tornado shelters and many towns have tornado sirens.