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: 913 AM EDT Thu Sep 20 2018

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Philadelphia, PA Local Forecast Office

31NM SSE New York NY

Marine Zone Forecast


...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON...
Synopsis: High pressure will continue building in from the north through Thursday before pushing off the New England coast through early Friday. A cold front will approach from the north and west on Friday before passing through the area Friday night and Saturday morning. The front will then stall just south of our area through the end of the weekend as high pressure builds to our north. The high begins pushing offshore through the beginning of next week.

Today
E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft, subsiding to 3 to 4 ft late. Swell mainly from the SE with a dominant period of 7 seconds.
Tonight
SE winds 5 to 10 kt. 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 25 kt in the afternoon. Seas 3 to 5 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, subsiding to 3 to 4 ft after midnight. Swell mainly from the E with a dominant period of 10 seconds.
Sat
W winds 10 to 15 kt with gusts up to 20 kt, becoming N in the afternoon. Seas 3 to 4 ft.
Sat Night
NE winds 5 to 10 kt. Seas around 3 ft. A chance of showers.
Sun
NE winds around 10 kt. Seas around 3 ft. A chance of showers.
Sun Night
E winds 10 to 15 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 in the morning.
Mon Night
E winds 15 to 20 kt. Seas 6 to 9 ft. A chance of showers.
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ABOUT THIS FORECAST

Last Update: 913 AM EDT Thu Sep 20 2018
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