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Marine Forecast for the Open Waters of Lake Michigan - August 23, 2026

National Weather Service marine forecast for the open waters of Lake Michigan, including synopsis, wave heights, and wind conditions for August 23-28, 2026.

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Marine Forecasts for the Open Waters of Lake Michigan

Summary: The National Weather Service Milwaukee/Sullivan issued an open lake forecast for Lake Michigan on August 23, 2026, predicting breezy northwest winds and potential waterspouts, with conditions expected to stabilize by Monday evening before a new low-pressure system arrives mid-week.

This marine forecast for the open waters of Lake Michigan (beyond five nautical miles from shore) covers the period from August 23 to August 28, 2026. Current conditions are influenced by low pressure near the Ontario-Quebec border, causing breezy northwest winds of 25-30 knots and wave heights of 4-8 feet. High pressure is expected to build into the region by Monday, leading to calmer conditions. A subsequent low-pressure system is forecast to cross the lake on Wednesday, bringing a shift to south-southwesterly winds, potential showers, and thunderstorms. The forecast provides detailed wind and wave projections for two major sectors: Sheboygan, WI to Pentwater, MI (North and South).

Document outline

1. Synopsis and Meteorological Overview 2. Forecast for Sheboygan, WI to Pentwater, MI (North) 3. Forecast for Sheboygan, WI to Pentwater, MI (South) 4. MAFOR (Marine Forecast) Codes 5. Additional Resources and Experimental Forecasts

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Marine Forecasts for the Open Waters of Lake Michigan

Summary: The National Weather Service Milwaukee/Sullivan issued an open lake forecast for Lake Michigan on August 23, 2026, predicting breezy northwest winds and potential waterspouts, with conditions expected to stabilize by Monday evening before a new low-pressure system arrives mid-week.

This marine forecast for the open waters of Lake Michigan (beyond five nautical miles from shore) covers the period from August 23 to August 28, 2026. Current conditions are influenced by low pressure near the Ontario-Quebec border, causing breezy northwest winds of 25-30 knots and wave heights of 4-8 feet. High pressure is expected to build into the region by Monday, leading to calmer conditions. A subsequent low-pressure system is forecast to cross the lake on Wednesday, bringing a shift to south-southwesterly winds, potential showers, and thunderstorms. The forecast provides detailed wind and wave projections for two major sectors: Sheboygan, WI to Pentwater, MI (North and South).

Document outline

1. Synopsis and Meteorological Overview 2. Forecast for Sheboygan, WI to Pentwater, MI (North) 3. Forecast for Sheboygan, WI to Pentwater, MI (South) 4. MAFOR (Marine Forecast) Codes 5. Additional Resources and Experimental Forecasts

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