East Coast Flash Flood/Severe Thunderstorm Threat Monday

A cold front and waves of low pressure will slowly shift across the Mid-Atlantic and Southeast states Monday and Tuesday. Heavy thunderstorms along this front may produce heavy rain and flash flooding with the highest threat Monday from Tennessee into New England. A few strong to severe thunderstorms are also possible mainly from Northern Maryland to southern New Jersey.
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Last Update: 929 PM EDT Sun Jul 21 2019

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Philadelphia, PA Local Forecast Office

31NM SSE New York NY

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.

Rest Of Tonight
W winds 5 to 10 kt, becoming N late. Seas around 3 ft late this evening and early morning, then 2 ft or less. Swell mainly from the S with a dominant period of 6 seconds. a chance of showers. A chance of tstms. Vsby 1 to 3 nm.
Mon
E winds 5 to 10 kt, becoming SE early in the afternoon, then becoming S 10 to 15 kt with gusts up to 20 kt late. Seas 2 ft or less, then 3 to 4 ft in the afternoon. Swell mainly from the S with a dominant period of 6 seconds. a chance of showers. A chance of tstms. Vsby 1 to 3 nm.
Mon Night
W winds 10 to 15 kt. Gusts up to 20 kt early in the evening. 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
N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 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
NW winds around 5 kt, increasing to 5 to 10 kt after midnight. Seas 3 to 4 ft. A chance of showers.
Wed
N winds 10 to 15 kt, becoming NE 5 to 10 kt in the afternoon. Seas around 3 ft.
Wed Night
SE winds around 5 kt, becoming NW after midnight. Seas 2 ft or less.
Thu
N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 ft or less.
Thu Night
S winds 5 to 10 kt, becoming SW after midnight. Seas 2 ft or less.
Fri
NW winds around 5 kt, becoming SE in the afternoon. Seas 2 ft or less.
Fri Night
S winds 5 to 10 kt, becoming SW after midnight. Seas around 3 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: 929 PM EDT Sun Jul 21 2019
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