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: 1133 AM EST Wed Dec 13 2017

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Philadelphia, PA Local Forecast Office

31NM SSE New York NY

Marine Zone Forecast


...GALE WARNING IN EFFECT THROUGH THIS EVENING...
Synopsis: High pressure will slide across to the south of the region today. A clipper system will cross the region late tonight into Thursday. High pressure will return for Thursday night and Friday. A low pressure system will move up the Mid Atlantic coast on Friday, remaining well offshore. A brief return to high pressure is expected for the weekend. Another system will affect the region early next week.

This Afternoon
W winds 25 to 30 kt with gusts up to 45 kt. seas 4 to 6 ft, building to 7 to 10 ft early, then subsiding to 5 to 8 ft late. Mainly in NW swell with a dominant period of 5 seconds.
Tonight
W winds 20 to 25 kt with gusts up to 40 kt, becoming SW 15 to 20 kt with gusts up to 30 kt in the late evening and early morning, then increasing to 20 to 25 kt with gusts up to 35 kt late. Seas 4 to 7 ft, subsiding to 3 to 5 ft in the late evening and overnight. Mainly in SW swell with a dominant period of 6 seconds.
Thu
NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Mainly in S swell with a dominant period of 8 seconds. a chance of snow early in the morning. Vsby 1 to 3 nm in the morning.
Thu Night
NW winds 10 to 15 kt with gusts up to 25 kt, diminishing to 5 to 10 kt late. Seas 3 to 4 ft. Mainly in S swell with a dominant period of 9 seconds.
Fri
W winds 5 to 10 kt. Seas 2 ft or less. A chance of snow and rain showers in the afternoon.
Fri Night
NW winds 5 to 10 kt, becoming W 15 to 20 kt with gusts up to 30 kt after midnight. Seas 2 ft or less, then 3 to 4 ft after midnight. A chance of snow showers in the evening.
Sat
NW winds 20 to 25 kt. Seas 3 to 5 ft.
Sat Night
NW winds 15 to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 3 to 4 ft in the evening, then 2 ft or less.
Sun
SW winds 10 to 15 kt. Seas 2 ft or less, then 3 to 4 ft in the afternoon. A chance of showers in the afternoon.
Sun Night
SW winds around 15 kt. Seas 3 to 5 ft. A chance of showers.
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ABOUT THIS FORECAST

Last Update: 1133 AM EST Wed Dec 13 2017
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