Heavy rain, mountain snow and strong winds in the western U.S. this week

The western U.S. will experience active weather yet again this week as significant Pacific moisture brings rain and mountain snow to the region. This heavy rain will bring flood concerns to parts of WA, OR and CA. Very heavy snow is possible in the Sierra, Cascades, Great Basin and parts of the northern Rockies.
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Last Update: 353 AM PST WED JAN 18 2017

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23NM SSW San Francisco CA

Marine Zone Forecast

...SMALL CRAFT ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 1 PM

Synopsis: GREATER FARALLONES...AND CORDELL BANK NATIONAL MARINE SANCTUARIES...

SOUTHERLY WINDS WILL INCREASE BY WEDNESDAY AHEAD OF A FRONTAL SYSTEM. WINDS WILL DECREASE LATE WEDNESDAY NIGHT AS THE LOW LIFTS NORTHEAST BUT WILL INCREASE AGAIN BY FRIDAY AS ANOTHER STORM APPROACHES. VERY LARGE WEST SWELLS WILL ARRIVE LATER THIS WEEK WITH SWELLS BUILDING AS HIGH AS 26 FEET FRIDAY AND SATURDAY.

Today
S winds 10 to 20 kt...increasing to 25 to 35 kt in the afternoon. Combined seas 8 to 12 ft dominant period 15 seconds. Chance of rain in the morning...then rain and slight chance of thunderstorms in the afternoon.
Tonight
S winds 30 to 40 kt...becoming W 10 to 20 kt after midnight. Combined seas 10 to 14 ft dominant period 14 seconds. Rain and slight chance of thunderstorms in the evening...then chance of rain after midnight.
Thu
W winds 5 to 15 kt...becoming S 5 kt in the afternoon. Wind waves 3 to 4 ft. W swell 11 to 13 ft at 17 seconds. Chance of showers.
Thu Night
SW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 13 to 15 ft at 17 seconds. Chance of showers in the evening... Then rain after midnight.
Fri
SW winds 20 to 30 kt. Gusts up to 50 kt. Wind waves 5 to 7 ft. W swell 14 to 17 ft at 17 seconds...increasing to 19 to 22 ft at 17 seconds. Rain.
Sat
SW winds 20 to 30 kt. Wind waves 4 to 6 ft. W swell 21 to 24 ft...decreasing to 15 to 18 ft. Chance of showers.
Sun
W winds 25 to 35 kt. Combined seas 11 to 14 ft... Decreasing to 2 to 15 ft. Rain. .....san francisco bar/fourfathom bank forecast..... in the deep water channel...combined seas building to 8 to 10 feet with a dominant period 15 seconds. across the bar...combined seas 8 to 11 ft dominant period 15 seconds. Maximum ebb current of -1.1 knots at 08:42 am wednesday and -1 knots at 07:48 pm wednesday.
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ABOUT THIS FORECAST

Last Update: 353 AM PST WED JAN 18 2017
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