Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]
    • Tonight

      Tonight:Variable winds 5 kt or less. Partly cloudy. Waves 1 ft or less.

      Low: 54 °F

      Light Wind
      < 1ft

    • Thursday

      Thursday:Variable winds 5 kt or less. A chance of showers, with thunderstorms also possible after 4pm.   Waves 1 ft or less.

      High: 63 °F

      Light Wind
      < 1ft

    • Thursday Night

      Thursday Night:Variable winds 5 kt or less. A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm.   Waves 1 ft or less.

      Low: 52 °F

      Light Wind
      < 1ft

    • Friday

      Friday:Variable winds 5 kt or less. Partly sunny. Waves 1 ft or less.

      High: 66 °F

      Light Wind
      < 1ft

    • Friday Night

      Friday Night:Variable winds 5 kt or less. Mostly cloudy. Waves 1 ft or less.

      Low: 54 °F

      Light Wind
      < 1ft

    • Saturday

      Saturday:NW wind around 10 kt. Mostly sunny. Waves 1 ft or less.

      High: 69 °F

      NW 10kt
      < 1ft

    • Saturday Night

      Saturday Night:NNW wind 5 to 10 kt. Partly cloudy. Waves 1 ft or less.

      Low: 51 °F

      NNW 10kt
      < 1ft

    • Sunday

      Sunday:N wind 5 to 10 kt becoming S in the afternoon. Mostly sunny. Waves 1 ft or less.

      High: 64 °F

      N 10kt
      < 1ft

    • Sunday Night

      Sunday Night:Variable winds 5 kt or less. Partly cloudy. Waves 1 ft or less.

      Low: 50 °F

      Light Wind
      < 1ft


High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 5:26 pm CDT Aug 19, 2026
Forecast Valid: 6pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026

View Nearby Observations

Detailed Forecast

Tonight
Variable winds 5 kt or less. Partly cloudy. Waves 1 ft or less.
Thursday
Variable winds 5 kt or less. A chance of showers, with thunderstorms also possible after 4pm. Waves 1 ft or less.
Thursday Night
Variable winds 5 kt or less. A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm. Waves 1 ft or less.
Friday
Variable winds 5 kt or less. Partly sunny. Waves 1 ft or less.
Friday Night
Variable winds 5 kt or less. Mostly cloudy. Waves 1 ft or less.
Saturday
NW wind around 10 kt. Mostly sunny. Waves 1 ft or less.
Saturday Night
NNW wind 5 to 10 kt. Partly cloudy. Waves 1 ft or less.
Sunday
N wind 5 to 10 kt becoming S in the afternoon. Mostly sunny. Waves 1 ft or less.
Sunday Night
Variable winds 5 kt or less. Partly cloudy. Waves 1 ft or less.

*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: 47.86°N 89.86°W
Last Update: 5:26 pm CDT Aug 19, 2026
Forecast Valid: 6pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
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