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.

Coastal Waters Forecast for Northerly Island to Calumet Harbor IL (LMZ742) (Text-Only)
NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742)
Issued by: National Weather Service Chicago, IL
Last Update: 350 AM CST Mon Dec 18 2017

Today: Southwest winds 10 to 20 kt. Patchy fog in the morning. Patchy drizzle in the morning. Waves 1 ft or less building to 1 to 3 ft.

Tonight: Southwest winds 20 to 25 kt. Mostly cloudy. Waves 2 to 4 ft.

Tuesday: West winds 20 to 25 kt diminishing to 15 to 20 kt in the afternoon. Mostly sunny. Waves 1 to 3 ft.

Tuesday Night: West winds 15 to 20 kt becoming northwest in the evening with occasional gusts to 25 kt. Mostly clear. Waves 1 to 3 ft building to 2 to 4 ft after midnight.

Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742)

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