Strong System To Move Through East; Very Unsettled Hawaii and Alaska

A strong cold front will sweep through the East on Monday with lake effect snow, high winds and strong to severe thunderstorms. Meanwhile, a powerful Kona low will produce multiple hazards across Hawaii, including heavy rain and potential catastrophic flooding. Finally, a winter storm is impacting Alaska as blizzard and winter storm warnings are in effect for much of western and southern Alaska.
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Gray/Portland, ME Local Forecast Office

4NM E Portsmouth NH

Marine Point Forecast

[NOTICE]
  • Today

    Scattered Showers

    Winds IncreasingS 20kt
    3-4ft

    High: 55 °F

  • Tonight

    Showers

    S 20kt
    4-5ft

    Low: 35 °F

  • Tuesday

    Mostly Sunny

    W 15ktWinds Decreasing
    3-4ft

    High: 40 °F

  • Tuesday
    Night

    Mostly Cloudy

    WNW 10kt
    2ft

    Low: 30 °F

  • Wednesday

    Chance Rain/Snow

    Light Wind
    2ft

    High: 35 °F

  • Wednesday
    Night

    Rain/Snow Likely

    N 10kt
    2ft

    Low: 27 °F

  • Thursday

    Mostly Sunny

    NNW 10ktWinds Decreasing
    2ft

    High: 37 °F

  • Thursday
    Night

    Mostly Cloudy

    Light Wind
    2-3ft

    Low: 30 °F

  • Friday

    Mostly Cloudy

    S 10kt
    4ft

    High: 45 °F


High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 7:16 am EST Dec 6, 2021
Forecast Valid: 10am EST Dec 6, 2021-6pm EST Dec 12, 2021

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Detailed Forecast


Synopsis: ANZ100-070215- 715 AM EST Mon Dec 6 2021 .Synopsis for Stonington ME to Merrimack River MA out to 25 NM... Low pressure will pass inland, with gusty southerly winds today. A cold front will then pass over the waters this evening with a sharp westerly wind shift. Gale force gusts are likely on all waters through tonight. High pressure will move overhead Tuesday, with winds gradually diminishing. Another storm system will approach the waters mid-week, with uncertain track but bringing a period of elevated seas. High pressure crests the waters by about Thursday, then increasing southerly flow takes us to the weekend. $$

Today
S wind 15 to 18 kt becoming S 17 to 20 kt in the afternoon. Winds could gust as high as 25 kt. Scattered showers before 1pm, then isolated showers after 5pm. Seas 3 to 4 ft.
Tonight
S wind 15 to 20 kt becoming W in the evening. Winds could gust as high as 30 kt. Showers and thunderstorms before 1am, then isolated showers between 1am and 3am. Seas 4 to 5 ft.
Tuesday
W wind 12 to 15 kt decreasing to 10 to 13 kt in the afternoon. Winds could gust as high as 25 kt. Mostly sunny. Seas 3 to 4 ft.
Tuesday Night
WNW wind 5 to 10 kt. Mostly cloudy. Seas around 2 ft.
Wednesday
Variable winds 5 kt or less. A chance of snow showers after 9am, mixing with rain after 1pm. Seas around 2 ft.
Wednesday Night
N wind around 10 kt. Rain and snow showers likely, becoming all snow after 8pm, then gradually ending. Seas around 2 ft.
Thursday
NNW wind 7 to 10 kt becoming NW 5 to 8 kt in the afternoon. Mostly sunny. Seas around 2 ft.
Thursday Night
Variable winds 5 kt or less. Mostly cloudy. Seas 2 to 3 ft.
Friday
S wind 5 to 10 kt. Mostly cloudy. Seas around 4 ft.

*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.
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ABOUT THIS FORECAST

Point Forecast: 43.06°N 70.69°W
Last Update: 7:16 am EST Dec 6, 2021
Forecast Valid: 10am EST Dec 6, 2021-6pm EST Dec 12, 2021
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