Southwest Monsoon Continues; Western Heat Wave Builds

Monsoonal thunderstorms will continue to bring a potential for flash flooding across the Desert Southwest and Four Corners region through at least Monday. Winds from these storms may produce blowing dust that could reduce visibility creating hazardous driving conditions. Meanwhile, scorching heat and critical fire weather conditions persist across parts of the West.

Hazardous Weather Conditions

For More Weather Information:

Gray/Portland, ME Local Forecast Office

25NM ENE Portsmouth NH

Marine Point Forecast

  • Late

    Heavy Rain

    SSE 10kt

    High: 68 °F

  • Tonight

    Patchy Fog

    S 10kt

    Low: 65 °F

  • Monday

    Areas Fog

    Winds IncreasingSSE 10kt

    High: 72 °F

  • Monday

    Chance Showers

    S 15kt

    Low: 67 °F

  • Tuesday

    Heavy Rain

    Winds IncreasingS 20kt

    High: 72 °F

  • Tuesday

    Heavy Rain

    SSW 20ktWinds Decreasing

    Low: 66 °F

  • Wednesday

    Showers Likely

    N 10kt

    High: 71 °F

  • Wednesday

    Mostly Clear

    NNW 10kt

    Low: 62 °F

  • Thursday


    NNW 10kt

    High: 70 °F

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 1:42 pm EDT Jul 15, 2018
Forecast Valid: 4pm EDT Jul 15, 2018-6pm EDT Jul 22, 2018

View Nearby Observations

Detailed Forecast

Synopsis: ANZ100-160930- 318 PM EDT Sun Jul 15 2018 .Synopsis for Stonington ME to Merrimack River MA out to 25 NM... A weak high pressure ridge will be over the waters through Monday before a strong cold front arrives on Tuesday and Tuesday night. High pressure builds into the region behind this front on Wednesday and remains over the waters through Friday. $$

Late Afternoon
SSE wind 5 to 10 kt. A slight chance of showers and thunderstorms. Some of the storms could produce small hail, gusty winds, and heavy rain. Seas around 3 ft.
S wind 5 to 10 kt. Patchy fog after 1am. Seas 3 to 4 ft.
SSE wind 5 to 8 kt increasing to 7 to 10 kt in the afternoon. Areas of fog before 10am. Seas around 3 ft.
Monday Night
S wind 10 to 15 kt. A chance of showers after midnight. Areas of fog. Seas around 3 ft.
S wind 15 to 18 kt increasing to 17 to 20 kt in the afternoon. Winds could gust as high as 25 kt. A chance of showers, then showers likely and possibly a thunderstorm after noon. Some of the storms could produce heavy rain. Areas of fog. Seas around 3 ft.
Tuesday Night
SSW wind 15 to 20 kt becoming WSW 10 to 15 kt after midnight. Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. Areas of fog. Seas around 4 ft.
N wind 5 to 10 kt. Showers likely before 8am. Seas around 3 ft.
Wednesday Night
NNW wind around 10 kt. Mostly clear. Seas around 3 ft.
NNW wind 5 to 10 kt becoming S in the afternoon. Sunny. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.


  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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Point Forecast: 43.18°N 70.24°W
Last Update: 1:42 pm EDT Jul 15, 2018
Forecast Valid: 4pm EDT Jul 15, 2018-6pm EDT Jul 22, 2018
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