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

Hazardous Weather Outlook

Last Update: 652 PM EDT Sun Jul 21 2019

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Philadelphia, PA Local Forecast Office

8NM ESE Atlantic City NJ

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 10 to 15 kt, becoming W 5 to 10 kt after midnight. Seas around 3 ft. Swell mainly from the S with a dominant period of 6 seconds. a chance of tstms this evening. A chance of showers. A 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 with gusts up to 25 kt. Seas around 3 ft early in the morning, then 2 ft or less, then 3 to 5 ft in the late morning and afternoon. Swell mainly from the S with a dominant period of 6 seconds. a chance of showers and tstms early in the morning. A chance of showers and tstms late. Vsby 1 to 3 nm.

Mon Night

SW winds 10 to 15 kt. Gusts up to 20 kt early in the evening, then 20 kt late. Seas 4 to 6 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 20 kt, becoming NW with gusts up to 20 kt in the late morning and early afternoon, then becoming N 5 to 10 kt late. Seas 3 to 5 ft. Swell mainly from the S with a dominant period of 8 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

N winds 5 to 10 kt. Seas 3 to 4 ft. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight.

Wed

N winds 5 to 10 kt. Seas around 3 ft.

Wed Night

N winds 5 to 10 kt. Seas 2 ft or less.

Thu

N winds 5 to 10 kt, becoming NE in the afternoon. Seas 2 ft or less.

Thu Night

SW winds around 5 kt. Seas 2 ft or less.

Fri

N winds around 5 kt, becoming SE in the afternoon. Seas 2 ft or less, then around 3 ft in the afternoon.