Arctic Air Plunges into the Great Lakes, Northeast and Mid-Atlantic

Arctic air dropping through the northern and eastern U.S. and a storm off the east coast will bring periods of snow, very cold wind chills and hazardous traveling conditions from the Upper Great Lakes to the Northeast. Meanwhile in southern California, Santa Ana winds will decrease but hot, dry air will remain over the area with elevated fire weather conditions.
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Last Update: 642 PM EST Wed Dec 13 2017

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Philadelphia, PA Local Forecast Office

10NM SE Lewes DE

Marine Zone Forecast


...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON...
Synopsis: A fast moving low pressure system will move across the area tonight and then offshore Thursday. High pressure will build over the area later Thursday through Friday. A low pressure system will move up along the coast Friday night, then high pressure arrives for much of this weekend. A few disturbances will be across the area later Sunday and lasting into early next week.

Tonight
SW winds 15 to 20 kt, increasing to 20 to 25 kt late. Gusts up to 30 kt. Seas 4 to 6 ft. Mainly in E swell with a dominant period of 10 seconds. snow with rain likely this evening, then a chance of snow, rain with a slight chance of sleet after midnight. Vsby 1 to 3 nm late this evening and overnight.
Thu
W winds 20 to 25 kt, becoming NW 15 to 20 kt late. Gusts up to 30 kt. Seas 4 to 6 ft. Mainly in S swell with a dominant period of 10 seconds.
Thu Night
NW winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt late. Seas 3 to 4 ft until early morning, then 2 ft or less. Mainly in SE swell with a dominant period of 7 seconds.
Fri
N winds around 5 kt early in the morning, becoming variable less than 5 kt, then becoming N around 5 kt late. Seas 2 ft or less. Mainly in SE swell with a dominant period of 7 seconds.
Fri Night
W winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 2 ft or less, then 3 to 4 ft after midnight.
Sat
NW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 4 ft.
Sat Night
NW winds 15 to 20 kt with gusts up to 25 kt, becoming N 5 to 10 kt after midnight. Seas 3 to 4 ft in the evening, then 2 ft or less.
Sun
NE winds around 5 kt, becoming SW in the afternoon. Seas 2 ft or less.
Sun Night
SW winds 10 to 15 kt. Seas around 3 ft in the evening, then 2 ft or less. A chance of showers.
Mon
W winds around 10 kt. Seas 2 ft or less. A chance of showers.
Mon Night
W winds around 10 kt. Seas 2 ft or less. A chance of showers in the evening.
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Last Update: 642 PM EST Wed Dec 13 2017
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