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Tornadoes??

Old 05-01-2011, 09:01 AM
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Default Tornadoes??

With the recent tornadoes in the mid-west and south, it dawned on me. I never hear about tornadoes in europe, south america, asia, australia, etc.
What is it that makes the US such a hotbed for these things?
Old 05-01-2011, 11:39 AM
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Originally Posted by Just1more View Post
With the recent tornadoes in the mid-west and south, it dawned on me. I never hear about tornadoes in europe, south america, asia, australia, etc.
What is it that makes the US such a hotbed for these things?
The Southern Pacific ocean. El Nino and La Nina

Pacific currents, Trade winds, and upwelling of cooler Pacific water.
Old 05-01-2011, 12:37 PM
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To The O.P. You asked.....

There are two air masses involved: maritime tropical (Mt) and Contental Polar (Cp). The Mt mass is warm and very moisture laden. The Cp is dry and colder. Then a front occurs associated with a cold front. The greater the difference between the two masses in temperature, the more powerful the storm will be. The Cp mass going over the rocky mountains, creats a low pressure ara somewhere over Tx, Ok, etc. The cold front makes a boundary using atmosphereic pressure. The differental in winds occurs here, due to temperature differentials. Usually, the Cp side is from NE to SW winds, and the Mt side is SW to NE. The low pressure area grows, being fed by the two masses diferential in temperature. The clouds at the junction MAY start rotating because of the wind differential. Theres a bit more involved, like high altitude winds, a wind sheer, etc, but I gave the basics above.
There are not many other nations which have the weather machine I just described.
Incidentally, the key west area is #1 for waterspouts, which of course, are maritime twisters. Here the Mt mass being a warmer, more humid mass from the gulf, and the cooler air from the land masses, however smaller they are.
If anyone is interested in Marine weather, try: Weather for the mariner, by E. Kotsch. The services use it as a basic textbook.
Old 05-01-2011, 01:22 PM
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Much simpler answer is the cooler air coming from down from Canada meets the much warmer and moister air coming off the Gulf of Mexico, meets around Texas and the weather machine starts up!
Old 05-01-2011, 02:34 PM
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Makes sense.
Old 05-01-2011, 03:33 PM
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Tornadoes happen all over the world:
http://www.islandnet.com/~see/weathe...oes-europe.htm

They just aren't that newsworthy unless they are really big or local.

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