National Weather Service United States Department of Commerce

Severe weather possible for parts of northern, central Plains and Upper Midwest, as well as parts of OH, TN Valleys and Southeast

The NWS Storm Prediction Center is forecasting a risk of severe thunderstorms Wednesday afternoon and evening for two areas: one covering parts of the northern & central Plains and Upper Midwest; and the other area covering parts of the Tenn. & Ohio Valleys and Southeast. Large hail & damaging winds will be the main threats, but there is a possibility of tornadoes for the Plains/Midwest area.
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Last Update: 839 AM PDT WED AUG 20 2014

View Nearby Observations

Waters from Point Reyes to Pigeon Point from 10 to 60 nm

Marine Zone Forecast





  • SynopsisMODERATE NORTHWESTERLY WINDS EXPECTED ACROSS THE NORTHERN OUTER WATERS TONIGHT AND OVER PORTIONS OF SAN FRANCISCO BAY THIS AFTERNOON. OTHERWISE GENERALLY LIGHT WINDS AND SEAS WILL CONTINUE. A MODERATE PERIOD SOUTH SWELL WILL MOVE INTO THE REGION LATER THIS WEEK DUE TO STORMS IN THE TROPICAL PACIFIC.
  • Today W winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 8 seconds. Patchy fog late in the morning.
  • Tonight NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft at 8 seconds. Patchy fog after midnight.
  • Thu NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft at 8 seconds and S 3 ft at 12 seconds. Patchy fog in the morning.
  • Thu Night NW winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell NW 4 to 6 ft at 8 seconds and S 3 to 4 ft at 11 seconds. Patchy fog after midnight.
  • Fri NW winds 10 to 20 kt. Wind waves 2 to 4 ft. Mixed swell NW 5 to 7 ft at 8 seconds and S 3 to 4 ft at 11 seconds. Patchy fog in the morning. Patchy fog after midnight.
  • Sat NW winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. NW swell 4 to 6 ft. SW swell 3 to 4 ft. Patchy fog.
  • Sun NW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft. SW swell 3 to 4 ft. Patchy fog.



Additional Forecasts and Information

Zone Area Forecast for Waters from Point Reyes to Pigeon Point from 10 to 60 nm
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