Heat Wave to End N.Y.C., D.C., Richmond

By Brian Edwards, Meteorologist
July 8, 2012; 7:15 AM ET
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The record heat wave across the county is ending from north to south. When will your area feel the relief?

Strong to severe thunderstorms are tracking through the mid-Atlantic in association with a cold front.

This front is the leading edge of the cooler air mass coming in from the north.

According to Expert Senior Meteorologist Alex Sosnowski, "The massive high pressure area responsible for the dangerous and relentless heat from the Midwest to the South will soon shift its position enough to allow a breath of fresh air to roll in from central Canada. The core of the heat will settle farther west."

Temperatures have already fallen from Chicago to Scranton and the humidity continue to make even farther progress south.

Cooling temperatures are also going to move into the remainder of the Great Lakes and parts of the Ohio Valley with 80-degree highs expected from Fort Wayne, Ind., to Detroit, Mich., and Pittsburgh, Pa. the next few days.

Farther to the east over the big cities of the I-95 corridor, cooling will take a little longer to make an appearance.

High temperatures for New York City and Philadelphia will remain hot this afternoon by reaching the lower 90s. It won't be quite as oppressive, but still above normal for the time of year.

The cooler and less humid air will finally make an appearance on Monday as highs fail to reach the 90-degree mark underneath mostly sunny skies.

The reason for the slower cool down in the mid-Atlantic is that the aforementioned cold front will be slowly making southward progress. In fact, it will be hung up over the central mid-Atlantic region today, helping to spark another round of severe weather for Washington, D.C., Baltimore, Md., Dover, Del., and Richmond, Va.

High temperatures today will break the 100-degree mark from Raleigh, N.C., to Norfolk, Va., and Richmond, Va. However, a cooling thunderstorm in the afternoon could help to drop the temperature somewhat.

As the cold front continues to track southward on Monday, high temperatures and humidity values will continue to fall over the mid-Atlantic. High temperatures for Richmond, Washington, D.C., and Baltimore will only reach the lower 80s on Monday. In fact, some places in north-central Pennsylvania won't get out of the 70s!

Cooling will even make it down into the Carolinas Monday with highs only in the lower 90s. A further drop in temperatures is expected Tuesday across this region.

Sosnowski also stated that "The Heat Wave of 2012, where 100 degrees is the new 90, will continue a while longer over the middle and eastern parts of the nation, but it has eyes for areas in the West in the days ahead. Folks in Boise, Salt Lake City and Spokane may soon get a taste of triple-digit temperatures."

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