Significant Snowfall for Washington Cascades and Northern Rocky Mountains

A cold front will linger for several days from the Pacific Northwest to portions of the northern Plains early this week. Cold temperatures and copious moisture will combine to produce several feet of snow into the mountain passes, with up to 4 feet of snow down to 4000 feet in the northern Rockies. Travel through mountain passes will be very difficult.
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Last Update: 918 PM EST Sun Dec 17 2017

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Philadelphia, PA Local Forecast Office

26NM S New York NY

Marine Zone Forecast


Synopsis: A warm front will lift northeast of our area early Monday, then a cold front moves through the Mid-Atlantic states Tuesday night. High pressure will follow by Thursday morning while an area of low pressure scoots out to sea to the east of the Carolinas. Thereafter, strengthening low pressure will track northeast from the Great Lakes region Friday, sending a warm front through our region, followed by a cold front on Saturday.

Rest Of Tonight
E winds 5 to 10 kt, becoming SW late. Seas 2 ft or less. Mainly in S swell with a dominant period of 5 seconds. a slight chance of light rain.
Mon
W winds 5 to 10 kt. Seas 2 ft or less. Mainly in S swell with a dominant period of 5 seconds.
Mon Night
W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 ft or less, then around 3 ft after midnight, then 2 ft or less after midnight. Mainly in S swell with a dominant period of 8 seconds.
Tue
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 ft or less, then around 3 ft in the late morning and afternoon. Mainly in S swell with a dominant period of 9 seconds.
Tue Night
W winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 4 ft.
Wed
NW winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft.
Wed Night
NW winds around 15 kt with gusts up to 20 kt. Seas around 3 ft.
Thu
N winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas around 3 ft in the morning, then 2 ft or less.
Thu Night
NE winds around 5 kt, becoming SE after midnight. Seas 2 ft or less.
Fri
SE winds 10 to 15 kt. Seas 2 ft or less. A chance of showers in the afternoon.
Fri Night
S winds around 15 kt. Seas around 3 ft, building to 4 to 6 ft after midnight. A chance of rain.
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ABOUT THIS FORECAST

Last Update: 918 PM EST Sun Dec 17 2017
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