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Why does North America get so many more tornadoes than the rest of the world?

Asked by Brian1946 (32273points) May 3rd, 2011

Here’s a global tornado distribution map.

I thought our geographic position relative to the Gulf of Mexico was a factor, but Europe has a similar position in relation to the Mediterranean Sea, and yet it seems to get far less tornado activity.

Do the Alps form an effective barrier against warm, moist air from the Mediterranean moving northward enough to meet cold air masses that are large enough to form tornadoes?

Could oceanic currents be a factor?

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