Source:
The New York TimesA punishing wave of heat and humidity continued its hold over a large part of the country on Saturday, raising the toll of heat-related deaths even as forecasters promised that relief, in the form of cooler air from Canada, would arrive Sunday.
From the Midwest to the Eastern Seaboard, it was as if the earth had broken its orbit and veered closer to the sun, with millions of Americans stepping outside on Saturday into temperatures that steadily climbed toward triple digits.
That, combined with the unrelenting humidity, pushed the heat index on Saturday afternoon toward a staggering 120 degrees in Washington and 105 to 115 degrees in New York, Philadelphia and other cities in the Northeast.
The National Weather Service said the mid-Atlantic could experience record high temperatures, including in Washington, where the thermometer hit 105 degrees at Dulles International Airport on Friday, the highest reading ever there.
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http://www.nytimes.com/2011/07/24/us/24heat.html