What happened to the heatwave? U.S. temperatures will drop 20 degrees below July averages

Many Americans are reaching for their jackets less than a week after a sweltering heat wave pushed temperatures to record highs, as a cold front sweeps across the country that's expected to last up to two weeks.

The cooler weather, which will sink temperatures between 5 and 20 degrees lower than July averages, will primarily affect the Upper Midwest, causing thunderstorms from Michigan to Illinois to eastern Missouri on Friday.

Temperatures on Friday will average 75 degrees Fahrenheit in Chicago, 70 degrees in Boston and 86 degrees in Charlotte, N.C. Saturday looks to be a little cooler than Friday .... http://www.sott.net