Powerful Storm to Impact Eastern Third of U.S. this weekend.

A developing storm system will bring a myriad of significant impacts this weekend. Heavy snow up to 18 inches from the Ohio Valley to the Northeast, and ice up to a quarter of an inch is forecast in places. Heavy rain may cause flash flooding from the Mid-South to the Mid-Atlantic. Severe thunderstorms with damaging winds and isolated tornadoes will be possible in the Deep South.
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Last Update: 931 PM EST Fri Jan 18 2019

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Philadelphia, PA Local Forecast Office

27NM SSE New York NY

Marine Zone Forecast


...GALE WARNING IN EFFECT SUNDAY AFTERNOON...
Synopsis: Low pressure will continue moving away from the coast tonight and high pressure builds toward the north across southeastern Canada yielding a brief period of quiet and dry weather. An expansive area of low pressure will approach the region from the west on Saturday and pass over our area overnight Saturday night and early Sunday morning bringing the first significant winter storm to the region. Strong Arctic high pressure will build quickly into the Mid-Atlantic through the early part of next week. Another area of low pressure will move across the Great Lakes and into southeastern Canada late Tuesday into Wednesday pushing a cold front across the region Wednesday.

Overnight
N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 ft or less. Swell mainly from the S with a dominant period of 7 seconds. patchy fog.
Sat
NE winds around 10 kt, becoming E 15 to 20 kt with gusts up to 25 kt late. Seas 2 ft or less, then around 3 ft late. Swell mainly from the E with a dominant period of 7 seconds. a chance of rain and snow in the afternoon with vsby 1 to 3 nm.
Sat Night
SE winds 20 to 25 kt, becoming S 15 to 20 kt late. Gusts up to 30 kt. Seas 4 to 7 ft, building to 6 to 9 ft after midnight. Swell mainly from the S with a dominant period of 6 seconds. rain with a chance of freezing rain in the evening, then rain after midnight. Vsby 1 to 3 nm in the evening.
Sun
W winds 15 to 20 kt with gusts up to 30 kt, becoming NW with gusts up to 30 kt late in the morning, then becoming N 25 to 30 kt with gusts up to 40 kt in the afternoon. Seas 7 to 10 ft, subsiding to 5 to 8 ft in the late morning and afternoon. Swell mainly from the S with a dominant period of 8 seconds. freezing rain likely in the morning. Rain. A chance of snow, freezing rain and sleet in the afternoon. Vsby 1 to 3 nm in the late morning and afternoon.
Sun Night
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to 7 ft. A chance of snow in the evening. A chance of freezing spray after midnight. Vsby 1 to 3 nm in the evening.
Mon
NW winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to 6 ft. Freezing spray likely.
Mon Night
NW winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 35 kt. Seas 3 to 5 ft. Light freezing spray likely.
Tue
NW winds 10 to 15 kt, becoming W 5 to 10 kt in the afternoon. Seas 2 ft or less.
Tue Night
SW winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Seas 3 to 5 ft, building to 4 to 7 ft after midnight.
Wed
SW winds 20 to 25 kt. Seas 4 to 7 ft. A chance of rain.
Wed Night
SW winds 10 to 15 kt. Seas 3 to 5 ft. A chance of rain. Vsby 1 to 3 nm after midnight.
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Last Update: 931 PM EST Fri Jan 18 2019
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