National Weather Service United States Department of Commerce

Heavy rain and mountain snow across the northwestern 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

8NM ESE Nantucket MA

Marine Point Forecast [NOTICE]

This
Afternoon

Chance Showers

N 12kt
2ft

High: 43 °F

Tonight

Showers Likely

ENE 9kt
2-3ft

Low: 39 °F

Sunday

Showers Likely

NNE 10kt
3ft

High: 43 °F

Sunday
Night

Mostly Cloudy

NNE 14kt
2-3ft

Low: 38 °F

Monday

Mostly Cloudy

ENE 12kt
2-3ft

High: 45 °F

Monday
Night

Slight Chc Showers

Winds IncreasingE 15kt
4ft

Low: 42 °F

Tuesday

Chance Showers

E 17ktWinds Decreasing
4ft

High: 49 °F

Tuesday
Night

Chance Showers

ESE 18kt
5ft

Low: 46 °F

Wednesday

Rain

Winds IncreasingESE 26kt
Waves Building8ft

High: 54 °F

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 9:52 am EST Dec 20, 2014
Forecast Valid: 12pm EST Dec 20, 2014-6pm EST Dec 26, 2014

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Detailed 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.
  • This Afternoon NNE wind 9 to 12 kt becoming N. A chance of showers, mainly after 2pm. Seas around 2 ft.
  • Tonight ENE wind 6 to 9 kt. Showers likely, mainly before 1am. Seas 2 to 3 ft.
  • Sunday NNE wind 8 to 10 kt. Showers likely, mainly before 8am. Seas around 3 ft.
  • Sunday Night NNE wind 9 to 14 kt. Mostly cloudy. Seas 2 to 3 ft.
  • Monday ENE wind 10 to 12 kt becoming N in the afternoon. Mostly cloudy. Seas 2 to 3 ft.
  • Monday Night NNE wind 8 to 11 kt becoming E 12 to 15 kt after midnight. Winds could gust as high as 22 kt. A slight chance of showers after midnight. Seas around 4 ft.
  • Tuesday E wind 14 to 17 kt decreasing to 11 to 14 kt in the afternoon. Winds could gust as high as 25 kt. A chance of showers after 11am. Seas around 4 ft.
  • Tuesday Night ESE wind 15 to 18 kt, with gusts as high as 29 kt. A chance of showers. Seas around 5 ft.
  • Wednesday ESE wind 20 to 23 kt increasing to 23 to 26 kt in the afternoon. Winds could gust as high as 34 kt. Rain. Seas 6 ft building to 8 ft.

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.

*Notices:
  1. This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
  2. The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.