Increasing Risk for Flash and River Flooding Through the Weekend

A storm system will track across the central U.S. and set the stage for severe thunderstorms and widespread heavy rainfall through the weekend. There will be a threat for flash and river flooding for portions of the Southern Plains into the Upper Midwest.
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Last Update: 1223 PM EDT FRI APR 28 2017

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Philadelphia, PA Local Forecast Office

10NM SE Lewes DE

Marine Zone Forecast


Synopsis: A COLD FRONT WILL WASH OUT AS IT MOVES ACROSS THE WATERS TODAY. A BACKDOOR COLD FRONT WILL MOVE ACROSS THE AREA SATURDAY INTO SATURDAY NIGHT. THIS FRONT WILL REMAIN NEAR THE DELMARVA AND SOUTHERN NEW JERSEY ON SUNDAY, THEN RETURN AS A WARM FRONT ON SUNDAY NIGHT. ANOTHER COLD FRONT IS EXPECTED ON MONDAY NIGHT AS AN AREA OF LOW PRESSURE MOVES INTO THE GREAT LAKES REGION. THIS LOW WILL DRIFT NORTHEAST THROUGH SOUTHEAST CANADA THROUGH THURSDAY, WITH A COUPLE OF WEAK SURFACE TROUGHS MOVING ACROSS THE AREA TUESDAY AND WEDNESDAY. AN AREA OF LOW PRESSURE MAY AFFECT THE MID ATLANTIC REGION LATE NEXT WEEK.

This Afternoon
SW winds 5 to 10 kt...becoming S late. Seas 3 to 4 ft. Mainly in SE swell with a dominant period of 8 seconds.
Tonight
S winds around 10 kt. Seas 3 to 4 ft. Mainly in SE swell with a dominant period of 7 seconds.
Sat
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Mainly in S swell with a dominant period of 7 seconds.
Sat Night
SW winds 10 to 15 kt with gusts up to 20 kt... Diminishing to 5 to 10 kt after midnight. Seas 3 to 4 ft. Mainly in S swell with a dominant period of 7 seconds. a chance of showers until early morning.
Sun
SE winds 5 to 10 kt...increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 4 ft.
Sun Night
S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Mon
S winds 15 to 20 kt...increasing to 20 to 25 kt in the afternoon. Seas 4 to 5 ft...building to 4 to 7 ft in the afternoon.
Mon Night
S winds 20 to 25 kt. Seas 5 to 8 ft. Showers likely with a chance of tstms.
Tue
SW winds 15 to 20 kt. Seas 4 to 7 ft. Showers likely with a chance of tstms in the morning.
Tue Night
SW winds 15 to 20 kt...becoming W 10 to 15 kt after midnight. Seas 4 to 6 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: 1223 PM EDT FRI APR 28 2017
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