National Weather Service United States Department of Commerce

Cold Front Crossing the Central U.S.

A cold front over the Northern Rockies will move eastward to the Upper Mississippi Valley/Central Plains by Monday. Rain will develop along the boundary over the Upper Midwest and move into the Upper Great Lakes by Monday. Some of the thunderstorms could become severe in portions of Texas through Monday.
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Last Update: 254 PM PDT SUN APR 20 2014

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Northern Inland Waters Including The San Juan Islands

Marine Zone Forecast





  • SynopsisA WEAKENING COLD FRONT WILL MOVE OVER THE WATERS TONIGHT...DISSIPATING AS IT PUSHES ONSHORE. LOW PRESSURE WILL APPROACH THE PACIFIC NORTHWEST MONDAY AND MOVE THROUGH THE AREA TUESDAY. THE REMAINDER OF THE WEEK LOOKS TO REMAIN UNSETTLED.
  • Tonight SE wind 5 to 15 kt. Wind waves 2 ft or less.
  • Mon Light wind. Wind waves less than 1 ft. A chance of showers.
  • Mon Night NW wind 5 to 15 kt. Wind waves 2 ft or less. A chance of showers...then showers likely after midnight.
  • Tue W wind 10 to 20 kt...becoming SW 15 to 25 kt in the afternoon. Wind waves 1 to 3 ft...building to 2 to 4 ft in the afternoon.
  • Tue Night W wind 5 to 15 kt...becoming SW after midnight. Wind waves 2 ft or less.
  • Wed S wind 5 to 15 kt in the morning...becoming light. Wind waves 2 ft or less.
  • Wed Night Light wind...becoming SE to 10 kt after midnight. Wind waves 1 ft or less.
  • Thu S wind 10 to 20 kt. Wind waves 1 to 3 ft.
  • Fri S wind 10 kt. Wind waves 1 ft or less.



Additional Forecasts and Information

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