Dangerous Heat Building in the South; Severe Storms From Plains To MS Valley

Intensifying high pressure is producing dangerous heat and humidity in the south-central U.S. with heat indexes possibly exceeding 110. Triple digit heat will also continue for some western areas. Elsewhere, a front moving through the central U.S. may produce severe thunderstorms and heavy rainfall in parts of the Plains and MS Valley through Friday.

For More Weather Information:

Gray/Portland, ME Local Forecast Office

25NM ENE Portsmouth NH

Marine Point Forecast

  • Today


    Winds IncreasingSSE 10kt

    High: 69 °F

  • Tonight

    Mostly Clear

    SSE 10kt

    Low: 60 °F

  • Saturday

    Mostly Sunny

    Light Wind

    High: 69 °F

  • Saturday

    Chance Showers

    E 10kt

    Low: 64 °F

  • Sunday

    Rain Likely

    ESE 15kt
    Waves Building6ft

    High: 71 °F

  • Sunday

    Showers Likely

    S 15kt

    Low: 66 °F

  • Monday

    Chance Showers

    S 15kt

    High: 72 °F

  • Monday

    Chance Showers

    S 15kt

    Low: 68 °F

  • Tuesday

    Chance Showers

    S 15kt

    High: 73 °F

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 9:35 am EDT Jul 20, 2018
Forecast Valid: 11am EDT Jul 20, 2018-6pm EDT Jul 26, 2018

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Detailed Forecast

Synopsis: ANZ100-210345- 931 AM EDT Fri Jul 20 2018 .Synopsis for Stonington ME to Merrimack River MA out to 25 NM... High pressure over the waters today will drift east tonight and Saturday. An area of low pressure with an associated warm front will approach from the south Saturday night and will lift north into the region on Sunday. A southerly warm and humid air mass will prevail behind the front early next week. $$

Variable winds less than 5 kt becoming SSE 5 to 10 kt in the afternoon. Sunny. Seas around 2 ft.
SSE wind 5 to 10 kt. Mostly clear. Seas around 2 ft.
Variable winds 5 kt or less. Mostly sunny. Seas around 2 ft.
Saturday Night
E wind 5 to 10 kt. A chance of showers after 2am. Areas of fog after 11pm. Seas 2 to 3 ft.
E wind around 15 kt becoming SSE in the afternoon. Winds could gust as high as 25 kt. A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 7am. Areas of fog before 9am. Seas 4 ft building to 6 ft.
Sunday Night
S wind 10 to 15 kt. Showers likely, mainly before 7pm. Seas 5 to 6 ft.
S wind 10 to 15 kt. A chance of showers. Seas around 5 ft.
Monday Night
S wind around 15 kt. A chance of showers. Seas around 5 ft.
S wind around 15 kt, with gusts as high as 20 kt. A chance of showers. Seas around 4 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: 9:35 am EDT Jul 20, 2018
Forecast Valid: 11am EDT Jul 20, 2018-6pm EDT Jul 26, 2018
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