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

11NM NW Fenwick Island Buoy DE

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
SE winds around 5 kt, becoming W. Seas 2 ft or less. Mainly in S swell with a dominant period of 7 seconds. a slight chance of light rain late this evening.
Mon
W winds 5 to 10 kt. Seas 2 ft or less. Mainly in S swell with a dominant period of 7 seconds.
Mon Night
W winds 5 to 10 kt. Seas 2 ft or less. Mainly in S swell with a dominant period of 6 seconds.
Tue
SW winds 5 to 10 kt. Gusts up to 20 kt late. Seas 2 ft or less. Mainly in S swell with a dominant period of 8 seconds.
Tue Night
W winds 5 to 10 kt with gusts up to 20 kt. Seas 2 ft or less.
Wed
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 ft or less.
Wed Night
N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 ft or less, then around 3 ft after midnight.
Thu
N winds 10 to 15 kt, becoming NE 5 to 10 kt in the afternoon. Seas around 3 ft in the morning, then 2 ft or less.
Thu Night
E winds around 5 kt, increasing to 5 to 10 kt after midnight. Seas 2 ft or less.
Fri
SE winds 5 to 10 kt. Seas 2 ft or less.
Fri Night
S winds 10 to 15 kt. Seas 3 to 5 ft. A chance of rain.
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ABOUT THIS FORECAST

Last Update: 918 PM EST Sun Dec 17 2017
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