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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Hazardous Weather Conditions

Last Update: 327 AM AKST Mon Dec 18 2017

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Anchorage, AK Local Forecast Office

42NM SW Shumagin Islands AK

Marine Zone Forecast

...GALE WARNING THROUGH TUESDAY...

Synopsis: A 946 mb low 380 nm northwest of Shemya will move to the northern Bering Tue morning. An associated strong front in the central Aleutians will move over the eastern Aleutians and dissipate by Tue afternoon. A 992 mb low will move to 80 nm west of Shemya Tue morning, then move to 160 nm northeast of Shemya at 976 mb Wed morning.

Today
SW wind 30 kt becoming S 40 kt in the afternoon. Seas 12 ft building to 17 ft in the afternoon. From the shumagin islands E, SW wind 30 kt, seas 10 ft.
Tonight
S wind 40 kt. Seas 23 ft. From the shumagin islands E, seas 13 ft building to 18 ft after midnight. Rain showers.
Tue
SW wind 25 kt. From the shumagin islands E, SW wind 35 kt diminishing to 25 kt in the afternoon. Seas 21 ft.
Tue Night
SW wind 25 kt. Seas 15 ft.
Wed
S wind 25 kt. Seas 13 ft.
Thu
E wind 40 kt. Seas 26 ft.
Fri
SE wind 30 kt. Seas 26 ft.
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ABOUT THIS FORECAST

Last Update: 327 AM AKST Mon Dec 18 2017
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