Excessive Heat Continues today for Portions of Central and Eastern U.S.; Change in Weather Pattern this Week

Dangerous heat and humidity continues today from portions of the Plains to the East Coast. A cold front will bring lower temperatures, and potential for strong to severe thunderstorms with damaging winds and heavy rain that could produce flash flooding to the Central and Eastern U.S. through early this week. High pressure shifts West this week with building heat and monsoonal moisture.
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Hazardous Weather Conditions

Last Update: 652 PM EDT Sun Jul 21 2019

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Philadelphia, PA Local Forecast Office

18NM N Fenwick Island Buoy DE

Marine Zone Forecast


Synopsis: Low pressure is expected to develop in the Ohio River Valley tonight before drifting eastward across northeastern Maryland, eastern Pennsylvania, Delaware, and New Jersey on Monday afternoon and Monday evening. As the low continues toward Nova Scotia on Tuesday, it is anticipated to pull a cold front slowly through our region. High pressure is forecast to build in from the west on Wednesday and Thursday. The center of the high is expected to slide off the coast next weekend but will still continue to influence our weather.

Tonight
SW winds 5 to 10 kt. Seas 2 ft or less, then around 3 ft after midnight. Swell mainly from the S with a dominant period of 6 seconds. a slight chance of tstms this evening. A slight chance of showers. A slight chance of tstms after midnight. Vsby 1 to 3 nm late this evening and overnight.
Mon
SW winds 5 to 10 kt, increasing to 15 to 20 kt. Seas 3 to 5 ft. Swell mainly from the S with a dominant period of 6 seconds. a chance of showers and tstms late.
Mon Night
SW winds 15 to 20 kt, diminishing to 10 to 15 kt with gusts up to 25 kt in the late evening and overnight. Seas 3 to 5 ft. Swell mainly from the S with a dominant period of 7 seconds. showers and tstms likely in the evening, then a chance of showers after midnight. Showers late. Vsby 1 to 3 nm.
Tue
W winds around 15 kt with gusts up to 25 kt, becoming N with gusts up to 20 kt in the late morning and afternoon. Seas 3 to 5 ft. Swell mainly from the S with a dominant period of 7 seconds. a chance of tstms in the morning. Showers. A chance of tstms in the afternoon. Vsby 1 to 3 nm until late afternoon.
Tue Night
NW winds 5 to 10 kt. Seas around 3 ft. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight.
Wed
N winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas around 3 ft in the morning, then 2 ft or less.
Wed Night
N winds 5 to 10 kt. Seas 2 ft or less.
Thu
NE winds 5 to 10 kt. Seas 2 ft or less.
Thu Night
SE winds around 5 kt. Seas 2 ft or less, then around 3 ft after midnight.
Fri
N winds around 5 kt, becoming E around 5 kt in the afternoon. Seas 3 to 4 ft.
Fri Night
SE winds 5 to 10 kt. Seas 3 to 4 ft. winds and seas higher in and near tstms.

Winds and seas higher in and near tstms.
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ABOUT THIS FORECAST

Last Update: 652 PM EDT Sun Jul 21 2019
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