Severe Thunderstorm and Tropical Storm Bertha Impacts

Numerous severe thunderstorms are expected across a broad region from the Ohio Valley to the Mid-Atlantic and Northeast States today into tonight. Swaths of damaging wind gusts are expected and some tornadoes are possible. Bertha is expected to bring tropical storm conditions to portions of the Gulf Coast from the Florida Panhandle westward to southeastern Louisiana later today and Wednesday. Read More >

Hazardous Weather Conditions

Last Update: 653 PM EDT Tue Jul 21 2026

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Philadelphia, PA Local Forecast Office

15NM E Lewes DE

Marine Zone Forecast

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE WEDNESDAY NIGHT... ...TORNADO WATCH 507 IN EFFECT UNTIL 9 PM EDT THIS EVENING...

Tonight

SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 5 ft, building to 5 to 7 ft after midnight. Wave detail: S 5 ft at 6 seconds, becoming S 6 ft at 8 seconds. Showers with tstms likely early this evening, then showers with a chance of tstms late this evening and overnight.

Wed

SW winds 15 to 20 kt with gusts up to 30 kt, diminishing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 5 to 7 ft, subsiding to 4 to 5 ft in the afternoon. Wave detail: S 6 ft at 8 seconds, becoming S 5 ft at 8 seconds. Showers likely. A chance of tstms in the afternoon.

Wed Night

SW winds around 10 kt, becoming NW after midnight. Seas 3 to 5 ft. Wave detail: S 4 ft at 8 seconds. Showers likely with a chance of tstms.

Thu

NE winds 10 to 15 kt. Seas 3 to 4 ft. Wave detail: S 3 ft at 7 seconds and N 2 ft at 3 seconds. A chance of showers in the morning.

Thu Night

E winds 5 to 10 kt. Seas 2 to 3 ft. Wave detail: SE 3 ft at 7 seconds and NE 2 ft at 5 seconds.

Fri

E winds around 10 kt. Seas 2 to 3 ft. Wave detail: E 2 ft at 6 seconds.

Fri Night

E winds around 10 kt. Seas around 3 ft.

Sat

NE winds 10 to 15 kt. Seas around 3 ft.