Why Does The U.S. Get More Tornadoes Than Anywhere Else?

Although strong tornadoes have been observed in all continents except Antarctica, the central US is the place where strong tornadoes are more likely than any place else. This is because of the Rocky Mountains and the Gulf of Mexico. Surface winds out of the south bring in warm, moist air at low levels and winds aloft out of the west bring in relatively cold, dry air above that from coming over the wide high range of mountains and High Desert that forms a long north-south barrier. The temperature and moisture profile brings in the right conditions for thunderstorms and the change of the wind with height means storms will rotate. No place else on the planet combines something like the Gulf/Caribbean area with the Rocky Mountains to make it relatively easy to make tornadoes. Via io9

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