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: 316 PM PDT WED AUG 20 2014

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Northern Inland Waters Including The San Juan Islands

Marine Zone Forecast





  • SynopsisHIGH PRESSURE WILL REMAIN OFFSHORE WITH LOWER PRESSURE INLAND THROUGH SUN FOR VARYING DEGREES OF ONSHORE FLOW.
  • Tonight SW wind 5 to 15 kt...becoming S 10 to 20 kt after midnight. Wind waves 1 to 3 ft.
  • Thu S wind 5 to 15 kt. Wind waves 2 ft or less. Patchy drizzle in the morning...then a chance of showers in the afternoon.
  • Thu Night SW wind 10 to 20 kt...becoming S after midnight. Wind waves 1 to 3 ft.
  • Fri Light wind...becoming SW 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
  • Fri Night W wind 5 to 15 kt...becoming SW after midnight. Wind waves 2 ft or less.
  • Sat NW wind 10 kt...becoming SW to 10 kt in the afternoon. Wind waves 1 ft or less.
  • Sat Night SW wind 5 to 15 kt. Wind waves 2 ft or less.
  • Sun NW wind 5 to 15 kt. Wind waves 2 ft or less.
  • Mon SW wind 5 to 15 kt. Wind waves 2 ft or less.



Additional Forecasts and Information

Zone Area Forecast for Northern Inland Waters Including The San Juan Islands
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