National Weather Service United States Department of Commerce

Severe weather expected for Upper Midwest on Wednesday

A potent storm system will bring a chance of severe thunderstorms to parts of the Upper Midwest on Wednesday and Wednesday night. Very large hail, damaging wind gusts, tornadoes and heavy rain are possible with these storms.
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Hazardous Weather Conditions

Last Update: 117 AM EDT WED SEP 3 2014

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Cape Cod Bay

Marine Zone Forecast





  • SynopsisA COLD FRONT WILL CROSS THE WATERS DURING THE OVERNIGHT HOURS TONIGHT. THE CENTER OF HIGH PRESSURE CROSSES THE WATERS THURSDAY AND MOVES SOUTHEAST OF THE WATERS FRIDAY. A COLD FRONT MOVES TO THE SOUTHERN NEW ENGLAND COAST SATURDAY AND DRIFTS ACROSS THE WATERS SUNDAY.

    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.
  • Rest Of Tonight SW winds around 10 kt with gusts up to 20 kt. Seas around 2 ft.
  • Wed NW winds 5 to 10 kt. Gusts up to 20 kt in the morning. Seas around 2 ft.
  • Wed Night W winds around 5 kt. Seas 1 foot or less.
  • Thu NW winds around 5 kt...becoming S in the afternoon. Seas 1 foot or less.
  • Thu Night SW winds 5 to 10 kt. Seas 1 foot or less.
  • Fri SW winds 5 to 10 kt...increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft.
  • Fri Night SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
  • Sat SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers and tstms.
  • Sat Night NW winds 5 to 10 kt. Seas around 2 ft. A chance of showers and tstms. Vsby 1 to 3 nm.
  • Sun NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
  • Sun Night NE winds 5 to 10 kt. Seas around 2 ft.

    winds and seas higher in and near tstms.

    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.




WINDS AND SEAS HIGHER IN AND NEAR TSTMS. 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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