Enhanced Risk for Severe Thunderstorms Across the Upper Midwest; Flash Flooding Possible from the Upper Midwest to Southern Plains and Desert Southwest Through Friday

Portions of the Upper Midwest will see an increased threat for severe thunderstorms through this evening, with a few strong tornadoes possible. The same region remains on alert for additional flash flood concerns. Heavy rainfall may lead to flash flooding across the Desert Southwest today, and Southern Plains by Friday. Finally, Major-to-record river flooding continues across the Carolinas.

For More Weather Information:

Gray/Portland, ME Local Forecast Office

20NM ENE Portsmouth NH

Marine Point Forecast

  • This

    Mostly Cloudy

    ENE 10kt

    High: 61 °F

  • Tonight

    Mostly Cloudy

    Light Wind

    Low: 59 °F

  • Friday

    Partly Sunny

    Winds IncreasingS 20kt
    Waves Building6ft

    High: 68 °F

  • Friday

    Showers Likely

    SW 20kt

    Low: 63 °F

  • Saturday

    Chance Showers

    WNW 15kt

    High: 66 °F

  • Saturday

    Mostly Clear

    Light Wind

    Low: 56 °F

  • Sunday


    Light Wind

    High: 63 °F

  • Sunday

    Mostly Clear

    Winds IncreasingNNE 10kt

    Low: 52 °F

  • Monday

    Mostly Sunny

    NE 15kt

    High: 58 °F

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 12:32 pm EDT Sep 20, 2018
Forecast Valid: 1pm EDT Sep 20, 2018-6pm EDT Sep 26, 2018

View Nearby Observations

Detailed Forecast

Synopsis: ANZ100-210530- 1126 AM EDT Thu Sep 20 2018 .Synopsis for Stonington ME to Merrimack River MA out to 25 NM... High pressure over the region will slowly retreat into the maritimes through tonight allowing a light east wind to continue. An increasing return south to southwest flow will develop Friday into Friday night in advance of an approaching strong cold front. The front will pass across the waters late Friday night with north to northwest winds behind the front. High pressure builds across the waters over the weekend allowing winds to diminish and become light. && $$

This Afternoon
ENE wind around 10 kt. Mostly cloudy. Seas around 4 ft.
Variable winds 5 kt or less. Mostly cloudy. Seas 3 to 4 ft.
S wind 10 to 15 kt increasing to 15 to 20 kt in the afternoon. Winds could gust as high as 30 kt. Partly sunny. Seas 4 ft building to 6 ft.
Friday Night
SW wind around 20 kt, with gusts as high as 35 kt. Showers likely and possibly a thunderstorm, mainly after 3am. Seas around 5 ft.
WNW wind 10 to 15 kt becoming N in the afternoon. Winds could gust as high as 25 kt. A chance of showers before 8am. Seas 3 to 4 ft.
Saturday Night
Variable winds 5 kt or less. Mostly clear. Seas around 2 ft.
Variable winds 5 kt or less. Sunny. Seas 1 to 2 ft.
Sunday Night
S wind 5 to 8 kt becoming NNE 7 to 10 kt after midnight. Winds could gust as high as 20 kt. Mostly clear. Seas 1 to 2 ft.
NE wind 10 to 15 kt, with gusts as high as 25 kt. Mostly sunny. 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: 43.17°N 70.36°W
Last Update: 12:32 pm EDT Sep 20, 2018
Forecast Valid: 1pm EDT Sep 20, 2018-6pm EDT Sep 26, 2018
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