Thunderstorms forming rapidly in eastern Iowa and northwest Illinois-

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Latest radar trends show rapidly developing thunderstorms in eastern Iowa and northwest Illinois racing northeast toward the Chicago area. Cloud tops have increased to 40,000  feet . So far 3/4 inch diameter hail has been reported at Altona Illinois, northeast of Galesburg  in Knox County.

Severe weather is possible in the Chicago area late this afternoon and tonight. A tornado watch is in effect for the entire Chicago area until 10 pm.