Unsettled Across the West; Increasingly Rainy with a Few Storms in the South

A frontal system will bring heavy precipitation, including mountain snowfall to much of the Pacific Northwest, northern California, and portions of the Rockies through Tuesday. Elsewhere, wet weather will return to much of the South with locally heavy rainfall; a few strong to severe thunderstorms will also be possible in this region by Tuesday.
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Last Update: 851 AM PST Mon Dec 18 2017

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Portland, OR Local Forecast Office

6NM W Cannon Beach OR

Marine Zone Forecast


...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY AFTERNOON...
Synopsis: A weak cold front will stall over the northern waters this morning. A surface low will form along the stalled frontal boundary and track to the Washington coast. This will bring a strong cold front with gale force winds Tue. A secondary low will move through Wed. Then conditions generally ease and improve for late in the week.

Today
W wind 10 to 15 kt, becoming S 5 to 10 kt in the afternoon. Wind waves W 3 ft at 4 seconds, shifting to the S 2 ft at 4 seconds in the afternoon. W swell 7 ft at 11 seconds. Rain likely.
Tonight
S wind 15 to 20 kt, rising to 25 to 30 kt after midnight. Combined seas 9 ft with a dominant period of 15 seconds. Rain.
Tue
S wind 30 to 35 kt, becoming SW 25 kt in the afternoon. Gusts to 45 kt in the late morning and early afternoon35 kt. Combined seas 18 ft with a dominant period of 13 seconds. Rain in the morning, then showers in the afternoon.
Tue Night
W wind 20 to 25 kt. Wind waves W 6 ft at 6 seconds. W swell 12 ft at 13 seconds. Showers.
Wed
NW wind 20 to 25 kt, becoming N 10 to 15 kt in the afternoon. Wind waves NW 4 ft at 5 seconds. W swell 12 ft at 12 seconds. Chance of showers.
Wed Night
NE wind 5 to 10 kt. Wind waves NE 2 ft at 4 seconds. NW swell 14 ft at 13 seconds.
Thu
E wind to 5 kt. Wind waves 1 ft. NW swell 9 ft.
Fri
N wind 10 to 15 kt. Wind waves 3 ft. W swell 7 ft.
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Last Update: 851 AM PST Mon Dec 18 2017
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