Enhanced Risk for Severe Thunderstorms Across the Upper Midwest; Flash Flooding Possible from the Upper Midwest to Southern Plains and Desert Southwest Through Friday

Portions of the Upper Midwest will see an increased threat for severe thunderstorms through this evening, with a few strong tornadoes possible. The same region remains on alert for additional flash flood concerns. Heavy rainfall may lead to flash flooding across the Desert Southwest today, and Southern Plains by Friday. Finally, Major-to-record river flooding continues across the Carolinas.
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Last Update: 628 PM EDT Thu Sep 20 2018

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Philadelphia, PA Local Forecast Office

8NM ESE Atlantic City NJ

Marine Zone Forecast


...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH LATE FRIDAY NIGHT...
Synopsis: High pressure across New England and the Canadian Maritimes will build offshore tonight, while nosing its way into the Mid Atlantic region. This high will build offshore Friday, before a cold front moves across the east coast late Friday night into Saturday morning. This front will stall to our south as high pressure builds across eastern Canada. This high will build across New England and the Canadian Maritimes Monday, then offshore into Tuesday. The front to our south is forecast to lift across the area as a warm front Tuesday into Tuesday night, followed by a cold front later Wednesday.

Tonight
E winds 10 to 15 kt with gusts up to 20 kt, becoming SE around 10 kt after midnight. Seas 3 to 4 ft. Swell mainly from the E with a dominant period of 8 seconds.
Fri
SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 4 ft. Swell mainly from the E with a dominant period of 9 seconds.
Fri Night
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Swell mainly from the E with a dominant period of 10 seconds.
Sat
SW winds 10 to 15 kt, becoming NE in the afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Swell mainly from the E with a dominant period of 10 seconds.
Sat Night
NE winds 5 to 10 kt. Seas around 3 ft. A chance of showers after midnight.
Sun
NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 3 ft. A chance of showers.
Sun Night
NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers.
Mon
E winds 15 to 20 kt. Seas 4 to 7 ft. A chance of showers.
Mon Night
E winds 15 to 20 kt. Seas 6 to 8 ft. A chance of showers.
Tue
SE winds 15 to 20 kt. Seas 6 to 8 ft. A chance of showers.
Tue Night
S winds 10 to 15 kt. Seas 4 to 7 ft. A chance of showers.
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Last Update: 628 PM EDT Thu Sep 20 2018
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