The Hadley cell is growing

The Hadley cell is growing. Its expansion above a larger swath of the American Southwest, along with a shifting of the jet stream and many storms northward, is a worrisome trend, says Seager. It means there is little chance that the Southwest can avoid becoming drier in the coming decades. In fact, when Seager's team analyzed some 49 computer projections of the region's likely future climate, using 19 major climate models, all but three scenarios agreed: drought ahead.

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If you're one of the tens of millions of people who live in the southwestern United States, get ready for drier weather. That's the message from Richard Seager, a climate scientist at Columbia University's Lamont-Doherty Earth Observatory. The American Southwest, says Seager, is soon likely to experience a "permanent drought" condition on par with the Dust Bowl of the 1930s.
That rather frightening prediction is the most likely scenario for the region, given the global warming now underway. "It is a matter of simple thermodynamics," says Seager. "The region will face a considerable increase in aridity over the coming decade."