Nation wilts as heat wave spreads eastward

Associated Press
Leena Allen, 9, cools off by standing in front of a misting fan during a visit to the Saint Louis Zoo Wednesday, July 20, 2011, in St. Louis. Much of the United States is trapped under a heat "dome" caused by a huge area of high pressure that's compressing hot, moist air beneath it, leading to miserable temperatures. (AP Photo/Jeff Roberson)

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Americans withered under yet another day of searing sun Friday as a heat wave spread in earnest into the urban core of the Northeast, while warnings about excessive heat stretched from Kansas to Maine and the Carolinas. (AP)

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