Briefing for Heat, Severe Storm, and Flash Flood Risks through Thursday

Dangerously hot and humid conditions are expected through Wednesday. There is also a threat of isolated severe thunderstorms on Wednesday. Flash flooding from locally heavy rainfall is possible on Thursday. See this briefing for details on these hazards. Read More >

Last Update: 402 PM EDT Wed Jul 30 2025

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Philadelphia, PA Local Forecast Office

15NM E Lewes DE

Marine Zone Forecast

Tonight

S winds 5 to 10 kt. Seas around 2 ft. Wave detail: S 2 ft at 3 seconds and SE 1 foot at 8 seconds.

Thu

S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds.

Thu Night

SE winds 10 to 15 kt. Seas around 2 ft. Wave detail: S 2 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of tstms. A chance of showers in the evening, then showers likely after midnight. Vsby 1 to 3 nm.

Fri

E winds around 15 kt, becoming NE in the afternoon. Seas 2 to 3 ft, building to 3 to 5 ft in the afternoon. Wave detail: SE 3 ft at 4 seconds and SE 1 foot at 9 seconds, becoming NE 4 ft at 5 seconds and S 1 foot at 5 seconds. A chance of tstms. Showers likely.

Fri Night

NE winds around 20 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave detail: SE 7 ft at 9 seconds and NE 5 ft at 5 seconds. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight.

Sat

NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 6 to 8 ft. Wave detail: NE 8 ft at 8 seconds.

Sat Night

NE winds 15 to 20 kt with gusts up to 25 kt, diminishing to around 10 kt after midnight. Seas 5 to 8 ft, subsiding to 4 to 6 ft after midnight.

Sun

NE winds around 10 kt. Seas 4 to 5 ft.

Sun Night

E winds 5 to 10 kt. Seas 3 to 4 ft.

Mon

E winds 5 to 10 kt. Seas 3 to 4 ft.

Mon Night

E winds 5 to 10 kt. Seas 2 to 4 ft.

winds and seas higher in and near tstms.