While D.C. is having a grand ol' weather day, a swatch of land stretching from Illinois through Indiana to Ohio to three other states has fallen under tornado watches and warnings. What's causing this discontent in the atmosphere? Blame it on a disturbedjet stream, a river of wind that can scream along at up to 450 m.p.h. several miles above in the sky.
The jet stream typically flows in a single thick band traveling west to east. But around this time during La Nina years, the stream can become split, with one vein coursing through the north part of the country and the other through the south. A split jet stream is a harbinger of severe weather; look above and you'll see why.
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