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: 939 PM EDT Wed Jul 17 2019

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Philadelphia, PA Local Forecast Office

31NM SSE New York NY

Marine Zone Forecast


...SEVERE THUNDERSTORM WATCH 516 IN EFFECT UNTIL 10 PM EDT THIS EVENING...
Synopsis: The remnants of former tropical cyclone Barry will continue to move across the area tonight through Thursday while a cold front slowly settles across the area as well. The front will finally push south of the area and wash out Thursday night. A lee side trough is forecast to develop across the east coast Friday and continue through the weekend. A couple of cold fronts move southward toward the area over the weekend, but never make it into the area, before a stronger cold front moves across the east coast Sunday night into Monday night.

Overnight
SW winds 15 to 20 kt, diminishing to 5 to 10 kt. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 6 seconds. patchy fog. Showers likely with a chance of tstms late this evening. A chance of showers and tstms, then a chance of showers with a slight chance of tstms late. Vsby 1 to 3 nm late this evening and early morning.
Thu
S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 6 seconds. patchy fog early in the morning. A chance of tstms. A chance of showers early in the morning, then showers likely in the late morning and afternoon.
Thu Night
SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt late in the evening, then becoming NW after midnight. Seas around 3 ft. Swell mainly from the S with a dominant period of 6 seconds. showers likely with a chance of tstms early in the evening, then a chance of showers in the late evening and early morning.
Fri
N winds around 5 kt, becoming NE around 5 kt late in the morning, then becoming S early in the afternoon, increasing to 10 to 15 kt with gusts up to 20 kt late. Seas around 3 ft. Swell mainly from the S with a dominant period of 6 seconds.
Fri Night
SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 3 ft.
Sat
SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas around 3 ft.
Sat Night
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft.
Sun
W winds 5 to 10 kt, becoming SW in the afternoon. Seas around 3 ft.
Sun Night
SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 3 to 4 ft. A chance of showers and tstms after midnight.
Mon
W winds 5 to 10 kt, becoming SW with gusts up to 20 kt in the afternoon. Seas around 3 ft. A chance of tstms. A chance of showers in the morning, then showers likely in the afternoon.
Mon Night
NW winds 5 to 10 kt. Seas 3 to 4 ft. Showers likely with a chance of tstms. winds and seas higher in and near tstms.
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ABOUT THIS FORECAST

Last Update: 939 PM EDT Wed Jul 17 2019
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