National Weather Service United States Department of Commerce

Heavy rain and mountain snow across the Northwest U.S. on Saturday

Another Pacific system will impact the West Coast today. Heavy rainfall could lead to flash flooding, river and small stream flooding as well as mudslides and debris flows, especially over burn scars. Strong winds and heavy elevation snowfall, with accumulations of 1 to 3 feet, could result in hazardous travel through mountain passes.
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Hazardous Weather Conditions

Last Update: 354 AM EST SAT DEC 20 2014

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Cape Cod Bay

Marine Zone Forecast





  • SynopsisHIGH PRES WILL SETUP ACROSS QUEBEC THIS WEEKEND WILL THEN SHIFT OVER NOVA SCOTIA AND THE CANADIAN MARITIMES MON AND TUE. A RAPIDLY INTENSIFYING LOW PRES SYSTEM WILL THEN PASS WELL TO OUR WEST ACROSS THE GREAT LAKES WED INTO WED NIGHT. THIS WILL BRING A PERIOD OF STRONG WINDS AND HIGH SEAS TO THE WATERS.

    FOR INFORMATION ON POSSIBLE HAZARDOUS WEATHER BEYOND THE 24-36 HOUR FORECAST PERIOD...PLEASE VISIT WWW.WEATHER.GOV/BOSTON AND FOLLOW THE CURRENT HAZARDS LINK ABOVE THE MAP ON THE LEFT.
  • Today NE winds 5 to 10 kt. Gusts up to 20 kt this afternoon. Seas 2 to 3 ft. A chance of showers with a slight chance of snow showers this morning...then showers likely this afternoon with vsby 1 to 3 nm.
  • Tonight NE winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Showers likely. Vsby 1 to 3 nm.
  • Sun NE winds 5 to 10 kt. Seas around 2 ft. Showers likely.
  • Sun Night NE winds 5 to 10 kt. Seas 2 to 3 ft.
  • Mon N winds 5 to 10 kt. Seas 2 to 3 ft.
  • Mon Night NE winds 5 to 10 kt...becoming E 10 to 15 kt with gusts up to 20 kt after midnight. Seas around 2 ft.
  • Tue E winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft. A chance of showers.
  • Tue Night E winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. A chance of showers.
  • Wed SE winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft. Rain.
  • Wed Night S winds 25 to 30 kt. Seas 3 to 5 ft. Rain. Vsby 1 to 3 nm.

    seas are reported as significant wave height...which is the average of the highest third of the waves. individual wave heights may be more than twice the significant wave height.




SEAS ARE REPORTED AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE OF THE HIGHEST THIRD OF THE WAVES. INDIVIDUAL WAVE HEIGHTS MAY BE MORE THAN TWICE THE SIGNIFICANT WAVE HEIGHT.

Additional Forecasts and Information

Zone Area Forecast for Cape Cod Bay
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