National Weather Service United States Department of Commerce

Heavy rain possible for the northern Rockies & Plains; severe storms for the Northern Plains

An unseasonably strong storm system in the northwest U.S. will bring showers and thunderstorms, with locally heavy rainfall, to the northern Rockies and northern Plains. Isolated flash floods will be possible in these areas. Some storms could become severe in parts of the Dakotas into Minnesota, with large hail and damaging winds. In addition, temperatures will be 10 to 20 degrees below average.
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38NM WNW San Francisco CA

Marine Point Forecast [NOTICE]

This
Afternoon

Mostly Cloudy

SSE 11kt
6ft

Tonight

Chance Drizzle

Winds IncreasingSW 7kt
6ft

Sunday

Chance Drizzle

S 7kt
5-6ft

Sunday
Night

Mostly Cloudy

W 9kt
5ft

Monday

Mostly Cloudy

WNW 9kt
5ft

Monday
Night

Mostly Cloudy

NW 8kt
4-5ft

Tuesday

Partly Sunny

Winds IncreasingSW 6kt
4ft

Tuesday
Night

Mostly Cloudy

W 9kt
4-5ft

Wednesday

Partly Sunny

Light Wind
4ft

Associated Zone Forecast which includes this point

Last Update: 2:09 am PDT Aug 23, 2014
Forecast Valid: 1pm PDT Aug 23, 2014-6pm PDT Aug 29, 2014

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Detailed Forecast



  • SynopsisA WEAK SURFACE PRESSURE GRADIENT WILL MAINTAIN GENERALLY LIGHT TO MODERATE WINDS ACROSS THE COASTAL WATERS THROUGH MUCH OF THE FORECAST PERIOD. THE STRONGEST WINDS ARE EXPECTED OVER THE NORTHERN WATERS. A MIXED SWELL FEATURING A MODERATE PERIOD SOUTHERLY COMPONENT WILL CONTINUE INTO EARLY NEXT WEEK.
  • This Afternoon SSE wind 8 to 11 kt. Mostly cloudy. Mixed swell...WNW 4 ft at 8 seconds and S 4 ft at 13 seconds. Wind waves around 1 ft.
  • Tonight Variable winds less than 5 kt becoming SW 5 to 7 kt in the evening. A chance of drizzle after 11pm. Patchy fog after 11pm. Mixed swell...WNW 4 ft at 8 seconds and S 4 ft at 12 seconds. Wind waves around 1 ft.
  • Sunday SW wind 5 to 7 kt becoming S in the morning. A chance of drizzle before 11am. Patchy fog before 11am. Mixed swell...WNW 4 ft at 9 seconds and S 3 to 4 ft at 11 seconds. Wind waves around 1 ft.
  • Sunday Night W wind around 9 kt. Mostly cloudy. Mixed swell...WNW 4 ft and S 2 ft becoming SSW. Wind waves around 1 ft.
  • Monday WNW wind 5 to 9 kt. Mostly cloudy. Mixed swell...WNW 4 ft and SW 2 ft. Wind waves around 1 ft.
  • Monday Night NW wind 6 to 8 kt becoming WSW in the evening. Mostly cloudy. Mixed swell...WNW 3 to 4 ft and SW 2 ft. Wind waves around 1 ft.
  • Tuesday Variable winds less than 5 kt becoming SW around 6 kt in the afternoon. Partly sunny. Mixed swell...WNW 4 ft and SW 2 ft. Wind waves around 1 ft.
  • Tuesday Night W wind 5 to 9 kt. Mostly cloudy. Mixed swell...WNW 4 ft and SW 3 ft becoming S. Wind waves around 1 ft.
  • Wednesday Variable winds 5 kt or less. Partly sunny. Mixed swell...WNW 3 ft and S 3 ft. Wind waves around 1 ft.

.....SAN FRANCISCO BAR/FOURFATHOM BANK FORECAST..... IN THE DEEP WATER CHANNEL...COMBINED SEAS 3 TO 5 FEET WITH A DOMINANT SWELL PERIOD OF 13 SECONDS. ACROSS THE BAR...COMBINED SEAS 4 TO 6 FEET WITH A DOMINANT SWELL PERIOD OF 13 SECONDS. MAXIMUM EBB CURRENT OF 1.4 KNOTS AT 03:30 PM SATURDAY AND 1.7 KNOTS AT 03:38 AM SUNDAY.

*Notices:
  1. This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
  2. The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.