Major Heat Wave Expected for Two-Thirds of the U.S.

A dangerous and widespread summer heat wave is expected through this upcoming weekend across much of the Central and Eastern U.S. A large dome of high pressure will allow high temperatures to surge into the 90s and 100s in many locations, while heat indices will top 100 and approach 110 degrees or higher. There also will be no relief at night, as low temperatures remain in the upper 70s and 80s.
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Last Update: 610 AM EDT Wed Jul 17 2019

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Philadelphia, PA Local Forecast Office

8NM ESE Atlantic City NJ

Marine Zone Forecast

Synopsis: The remnants of former tropical cyclone Barry will cross the area later today into Thursday. High pressure will then generally prevail into the weekend although a weak cold front associated with a low in Canada may cross the area Sunday. A more significant cold front will pass through the area early next week.

Today

SW winds 10 to 15 kt, becoming S 15 to 20 kt late. Seas around 3 ft early this morning, then 2 ft or less, then around 3 ft this afternoon. Swell mainly from the SE with a dominant period of 10 seconds. a chance of showers and tstms late.

Tonight

SW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Swell mainly from the SE with a dominant period of 10 seconds. a chance of showers and tstms. Areas of fog after midnight with vsby 1 to 3 nm.

Thu

SW winds 5 to 10 kt. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 9 seconds. areas of fog early in the morning. A chance of showers and tstms. Vsby 1 to 3 nm.

Thu Night

SW winds 5 to 10 kt, becoming NW after midnight. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 7 seconds. a chance of tstms early in the evening. A chance of showers until early morning. Vsby 1 to 3 nm early in the evening.

Fri

N winds around 5 kt, becoming S in the afternoon. Seas around 3 ft.

Fri Night

SW winds 10 to 15 kt. Seas around 3 ft.

Sat

W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 3 ft in the morning, then 2 ft or less.

Sat Night

SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 3 ft.

Sun

SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 ft or less, then around 3 ft in the afternoon.

Sun Night

SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 3 ft. A chance of showers and tstms. winds and seas higher in and near tstms.