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: 250 AM PDT WED AUG 20 2014

View Nearby Observations

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

Marine Zone Forecast





  • SynopsisMODERATE NORTHWESTERLY WINDS EXPECTED ACROSS THE NORTHERN OUTER WATERS THIS EVENING AND TONIGHT AND OVER PORTIONS OF SAN FRANCISCO BAY DURING THE AFTERNOON HOURS. 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 SW winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft at 8 seconds. Patchy fog in the morning.
  • Tonight S winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 8 seconds. Patchy fog after midnight.
  • Thu SW winds 10 kt. Wind waves 2 ft or less. mixed swell NW 3 to 5 ft at 8 seconds and S 3 ft at 12 seconds. Patchy fog in the morning.
  • Thu Night W winds 5 kt. Wind waves 2 ft or less. mixed swell NW 2 to 4 ft at 8 seconds and S 3 ft at 11 seconds. Patchy fog after midnight.
  • Fri W winds 10 kt...becoming NW 10 to 20 kt. wind waves 2 ft or less...becoming 3 to 4 ft. mixed swell NW 2 to 4 ft at 8 seconds and S 3 to 4 ft at 11 seconds. Patchy night and morning fog.
  • Sat W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft. SW swell 3 to 4 ft. Patchy fog.
  • Sun W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 3 ft. SW swell 3 to 4 ft. Patchy fog.



Additional Forecasts and Information

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