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: 603 AM EST Mon Dec 18 2017

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Philadelphia, PA Local Forecast Office

35NM NNW Lewes DE

Marine Zone Forecast


Synopsis: A warm frontal boundary will continue to lift north of the region today with high pressure building into the southeast United States. A cold front will then move through the region late Tuesday into Wednesday. High pressure will then build southeastward into the region for the middle of the week. On Friday, an area of low pressure will track northeast into the Great Lakes bringing a warm front through our region. This will be followed by a cold frontal passage at the end of the week or early next week.

Today
W winds around 5 kt. Waves 2 ft or less.
Tonight
W winds 5 to 10 kt. Waves 2 ft or less.
Tue
W winds 5 to 10 kt. Waves 2 ft or less.
Tue Night
W winds 5 to 10 kt. Waves 2 ft or less.
Wed
NW winds 5 to 10 kt with gusts up to 20 kt. Waves 2 ft or less.
Wed Night
N winds 5 to 10 kt. Waves 2 ft or less.
Thu
N winds 5 to 10 kt, becoming NE in the afternoon. Waves 2 ft or less.
Thu Night
SE winds around 5 kt. Waves 2 ft or less.
Fri
S winds 5 to 10 kt. Waves 2 ft or less. A chance of rain in the afternoon.
Fri Night
S winds 10 to 15 kt. Waves 2 ft or less. A chance of rain.
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ABOUT THIS FORECAST

Last Update: 603 AM EST Mon Dec 18 2017
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