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

19NM NNE Lewes 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 around 5 kt. Waves 2 ft or less. A slight chance of light rain late this evening.
Mon
W winds around 5 kt. Waves 2 ft or less.
Mon Night
W winds 5 to 10 kt. Waves 2 ft or less, then around 3 ft after midnight, then 2 ft or less late.
Tue
W winds 5 to 10 kt. Waves 2 ft or less, then around 3 ft early in the morning, then 2 ft or less early in the afternoon, then around 3 ft late.
Tue Night
W winds 5 to 10 kt, increasing to 10 to 15 kt after midnight. Gusts up to 20 kt. Waves around 3 ft.
Wed
NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 3 ft.
Wed Night
N winds around 10 kt. Waves around 3 ft.
Thu
N winds 5 to 10 kt, becoming NE in the afternoon. Waves around 3 ft in the morning, then 2 ft or less.
Thu Night
E winds around 5 kt. Waves 2 ft or less.
Fri
SE winds 5 to 10 kt. Waves 2 ft or less. A chance of showers in the afternoon.
Fri Night
S winds around 10 kt. Waves around 3 ft. A chance of rain.
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Last Update: 918 PM EST Sun Dec 17 2017
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