Dangerous Heat and Humidity Building from the Plains to the East Coast

A strengthening ridge of high pressure will produce much above average temperatures from the Plains to the East Coast, a true summer heat wave. Highs in the 90s and triple digits combined w/ humidity and dewpoints surging into the upper 70s, if not low 80s, will create heat indices as high as 110 to 115 through this weekend. Air quality will likely be poor due to haze and little air circulation.
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Last Update: 611 AM EDT Thu Jul 18 2019

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Philadelphia, PA Local Forecast Office

27NM SSE New York NY

Marine Zone Forecast


Synopsis: Weak low pressure will remain over our region today before drifting out over the ocean tonight. Hot humid high pressure is forecast to build up from the southwest for Friday and the weekend. A slow moving cold front approaching from the northwest is expected to arrive on Monday, followed by an area of high pressure from the west for the middle of the new week.

Today
S winds 5 to 10 kt. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 6 seconds. patchy fog early this morning. A slight chance of showers and tstms this morning, then showers likely with a chance of tstms this afternoon.
Tonight
S winds 5 to 10 kt, becoming SW after midnight, then becoming NW late. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 6 seconds. a chance of tstms early in the evening. Showers likely in the evening. A chance of showers after midnight. Patchy fog after midnight.
Fri
N winds 5 to 10 kt, becoming S in the afternoon. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 8 seconds. patchy fog early in the morning.
Fri Night
SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 9 seconds.
Sat
SW winds around 10 kt. Seas around 3 ft.
Sat Night
SW winds 10 to 15 kt. Seas around 3 ft.
Sun
W winds 5 to 10 kt, becoming SW 10 to 15 kt in the afternoon. Seas 3 to 4 ft.
Sun Night
SW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt after midnight. Seas 3 to 4 ft. A chance of showers and tstms.
Mon
W winds 5 to 10 kt, becoming SW in the afternoon. Seas around 3 ft. A chance of showers and tstms.
Mon Night
W winds 5 to 10 kt, becoming NW after midnight. Seas around 3 ft. A chance of showers and tstms. winds and seas higher in and near tstms.

Winds and seas higher in and near tstms.
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Last Update: 611 AM EDT Thu Jul 18 2019
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