Severe Thunderstorms Possible for the Central Gulf Coast; More Storms Move into the West

Strong to severe thunderstorms will be possible over the next several days along the central Gulf Coast and portions of the southeast. Storms may contain damaging winds, large hail and isolated tornadoes. Meanwhile, more storms will bring heavy rain, with heavy snow in the mountains to California and the southern Rockies through the weekend.
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Last Update: 922 AM PST FRI JAN 20 2017

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13NM WNW San Francisco CA

Marine Zone Forecast

...SMALL CRAFT ADVISORY FOR ROUGH BAR IN EFFECT THROUGH LATE

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

STRONG SOUTHERLY GALE FORCE WINDS WILL CONTINUE ACROSS THE COASTAL WATERS THROUGH THIS MORNING AHEAD OF AN APPROACHING COLD FRONT. AS A RESULT ROUGH AND HAZARDOUS SEAS WILL CONTINUE THROUGH TODAY. AFTER THE FRONT PASSES THIS MORNING WINDS WILL SHIFT TO THE WEST BUT REMAIN MODERATE AND GUSTY. WINDS WILL INCREASE AGAIN SATURDAY NIGHT AS ANOTHER FRONTAL SYSTEM APPROACHES. VERY LARGE SWELLS ARRIVE FRIDAY AFTERNOON WITH SWELL HEIGHTS BUILDING TO 25 TO 30 FEET FRIDAY NIGHT AND SATURDAY. ROGUE WAVES OF 30 FEET OR GREATER ARE POSSIBLE DURING THIS TIMEFRAME.

Today
W winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 14 to 17 ft at 17 seconds. Showers late in the morning. Slight chance of thunderstorms through the day. Showers likely in the afternoon.
Tonight
W winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 18 to 21 ft at 17 seconds. Showers likely in the evening. Slight chance of thunderstorms through the night. Chance of showers after midnight.
Sat
W winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 22 to 25 ft at 18 seconds. Chance of showers in the morning...then slight chance of showers in the afternoon.
Sat Night
S winds 20 to 30 kt. Wind waves 5 to 7 ft. W swell 16 to 19 ft at 18 seconds. Rain likely in the evening...then rain after midnight.
Sun
S winds 25 to 35 kt...becoming SW 5 to 15 kt. Combined seas 6 to 18 ft...decreasing to 2 to 16 ft. Rain...then showers likely in the evening. Chance of showers after midnight.
Mon
W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 13 to 16 ft...increasing to 16 to 19 ft. Chance of showers...then showers likely.
Tue
NE winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. W swell 14 to 17 ft...decreasing to 9 to 12 ft. Slight chance of showers. .....san francisco bar/fourfathom bank forecast..... in the deep water channel...combined seas building to 13 to 17 feet with a dominant period 15 seconds. across the bar...combined seas 13 to 17 ft dominant period 15 seconds. Breakers to 20 ft possible during maximum ebb current of -1.2 knots at 10:48 am friday and -0.6 knots at 09:48 pm friday.
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ABOUT THIS FORECAST

Last Update: 922 AM PST FRI JAN 20 2017
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