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Good question, and I really don't know, but I did come across this article regarding the connection between tornadoes and GCC (note: the article is 5 years old, so keep that in mind):
'Tornadoes too complex to figure
By Miguel Llanos MSNBC
Jan. 10, 1998 - It's tempting to link tornadoes to global warming but, as with hurricanes, the scientific evidence is just not strong enough to make that claim.
TORNADO FREQUENCY in the United States this decade is the highest since modern record keeping began in 1953. But not enough reliable historical data exists to see how that frequency compares over centuries, and thus to see if it's beyond the natural variation over time. As with hurricanes, the Intergovernmental Panel on Climate Change concluded that 'knowledge is currently insufficient to say whether there will be any changes in the occurence or geographical distribution' of tornadoes. The existing data 'is so poor that there's no way to draw conclusions,' says Harold Brooks, a researcher at the U.S. National Severe Storms Laboratory. Data collection during the last 15 years has been decent, he adds, but anything before that is not useful in trying to determine whether global warming might be a factor in the formation or severity of tornadoes. And the complex relationship between tornadoes and the environment, Brooks says, means that computer models aren't sophisticated enough to say very much. At some point in the future, scientists might be able to draw conclusions, but that could be as much as 50 years away.
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