National Weather Service United States Department of Commerce

Severe weather possible for parts of northern Plains and mid/upper Mississippi River Valley

Severe thunderstorms are expected across portions of the northern Plains and upper Mississippi Valley Wednesday. Large hail and damaging winds will be the main threats with these storms, but a tornado or two could occur as well. Other strong to severe storms may occur from late afternoon into the overnight hours from the middle Mississippi Valley into the lower Ohio Valley.
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Last Update: 913 PM PDT TUE AUG 19 2014

View Nearby Observations

Coastal Waters from Point Reyes to Pigeon Point out to 10 nm

Marine Zone Forecast





  • SynopsisMODERATE NORTHWESTERLY WINDS ACROSS THE NORTHERN OUTER WATERS TONIGHT INTO WEDNESDAY AND OVER PORTIONS OF SAN FRANCISCO BAY DURING THE AFTERNOONS. OTHERWISE GENERALLY LIGHT WINDS AND SEAS WILL CONTINUE. MODERATE PERIOD SOUTH SWELL MOVES INTO THE WATERS LATER THIS WEEK DUE TO STORMS IN THE TROPICAL PACIFIC.
  • Tonight SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 8 seconds and SW 3 ft at 15 seconds. Patchy fog after midnight.
  • Wed S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 4 ft at 8 seconds and SW 3 ft at 14 seconds. Patchy fog in the morning.
  • Wed Night S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 8 seconds and SW 3 ft at 14 seconds. Patchy fog after midnight.
  • Thu S winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell NW 2 to 4 ft at 9 seconds and S 3 ft at 12 seconds. Patchy fog in the morning.
  • Thu Night W winds 10 kt. Wind waves 2 ft or less. Mixed swell NW 3 to 5 ft at 9 seconds and S 3 ft at 11 seconds. Patchy fog after midnight.
  • Fri W winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell NW 2 to 4 ft and S 3 ft. Patchy fog.
  • Sat W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft. SW swell 3 to 4 ft. Patchy fog.
  • Sun W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft. SW swell 3 to 4 ft. Patchy fog.

    .....san francisco bar/fourfathom bank forecast.....

    in the deep water channel...combined seas 3 to 4 feet with a dominant swell period of 7 seconds.

    across the bar...combined seas 3 to 5 feet with a dominant swell period of 7 seconds. Maximum ebb current of 1.6 knots at 12:21 am wednesday and 1.1 knots at 01:10 pm wednesday.




.....SAN FRANCISCO BAR/FOURFATHOM BANK FORECAST..... IN THE DEEP WATER CHANNEL...COMBINED SEAS 3 TO 4 FEET WITH A DOMINANT SWELL PERIOD OF 7 SECONDS. ACROSS THE BAR...COMBINED SEAS 3 TO 5 FEET WITH A DOMINANT SWELL PERIOD OF 7 SECONDS. MAXIMUM EBB CURRENT OF 1.6 KNOTS AT 12:21 AM WEDNESDAY AND 1.1 KNOTS AT 01:10 PM WEDNESDAY.

Additional Forecasts and Information

Zone Area Forecast for Coastal Waters from Point Reyes to Pigeon Point out to 10 nm
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