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NO USE NEW YORK CITY MEDIA MARKET WEBSITES**~ A massive heat wave that has enveloped the U.S. Midwest pushed into the Northeast on Friday, ushering in temperatures that could top 100 degrees Fahrenheit (38 degrees C) in Washington and prompting utilities to take steps to prevent power outages.
"Take this weather seriously.
We have not seen temperatures like this in at least seven years.
We haven't seen this many concentrated hot days in a long, long time," New York Mayor Bill de Blasio said in a news conference on Friday.
The huge blob of warm air is likely to blanket the region, home to a third of the U.S. population, through Sunday with little overnight relief, said meteorologist David Roth of the National Weather Service's Weather Prediction Center.
"There are 124 million people under a heat advisory or excessive heat warning - that's a third of the population," Roth said.
As of Friday, the heat wave sprawled from Kansas to the Atlantic Coast, and from South Carolina north to Maine.
It was expected to intensify on Saturday and Sunday.
On the East Coast, temperatures on Friday were forecast to reach near 100F (38 C) in Washington, 97F (36C) in Philadelphia and 91F (33C) in New York, where it would feel more like 110F (43C) with high humidity, Roth said.
On Saturday, the forecast called for 99F (37C) in New York and Philadelphia and 100F (38C) in Washington.
Much the same was in the forecast for Sunday.