Heat Wave Is Moving Backward

WASHINGTON (July 18, 20130--The heat wave in the Northeast has meteorologists scratching their heads because it’s moving from east to west across the country, something that rarely happens.

The operations chief at the National Weather Service's prediction branch says the western Atlantic high pressure system behind the hot dry weather started moving east to west last week and by Tuesday was centered over Lower Michigan.

Jon Gottschalck said the high pressure was going the wrong way because normally U.S. weather systems move west to east.

The high pressure is about to return eastward, extending the Northeastern heat wave for an extra day or so until the weekend, he said.

He said there's no evidence pointing at man-made climate change, but this is likely just natural chaos in the atmosphere.

Thursday, the heat index hit 106 degrees in Washington and Philadelphia.

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