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: 258 AM PST Mon Dec 18 2017

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Seattle, WA Local Forecast Office

46NM WSW Forks WA

Marine Zone Forecast

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY

Synopsis: PZZ100-182000- 258 AM PST Mon Dec 18 2017 .Synopsis for the northern and central Washington coastal and inland waters...A frontal system over the area will sag south this morning. A second vigorous frontal system will move through the area tonight and Tuesday. An associated deepening surface low will cross the waters Tuesday. Offshore flow will develop Wednesday and continue Thursday and Friday. $$

Today
NW wind 5 to 15 kt easing to 10 kt in the afternoon. Wind waves 2 ft or less. W swell 8 ft at 11 seconds. A slight chance of rain in the morning then a chance of rain in the afternoon.
Tonight
E wind 5 to 15 kt becoming SE 15 to 25 kt after midnight. Wind waves 2 ft or less building to 3 to 5 ft after midnight. W swell 9 ft at 15 seconds. Rain.
Tue
SW wind 25 to 35 kt becoming W 25 to 30 kt in the afternoon. Combined seas 11 to 14 ft with a dominant period of 14 seconds. Rain in the morning then rain likely in the afternoon.
Tue Night
NW wind 20 to 30 kt. Wind waves 5 to 7 ft.
Wed
N wind 15 to 25 kt easing to 5 to 15 kt in the afternoon. Wind waves 3 to 5 ft subsiding to 2 ft or less in the afternoon. W swell 14 ft at 12 seconds.
Wed Night
NE wind to 10 kt becoming E after midnight. Wind waves 1 ft or less. NW swell 11 ft at 11 seconds.
Thu
SE wind to 10 kt becoming W 5 to 15 ft. Wind waves 2 ft or less. NW swell 7 ft.
Fri
N wind 5 to 15 kt becoming NE 10 to 20 kt. Wind waves 1 to 3 ft. W swell 6 ft.
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ABOUT THIS FORECAST

Last Update: 258 AM PST Mon Dec 18 2017
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