Expires:202507111515;;248874 FZUS63 KMKX 110813 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 313 AM CDT Fri Jul 11 2025 FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan. Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered. .SYNOPSIS... Active pattern today into Saturday with periods of thunderstorms as a broad low pressure around 29.8 inches slowly lifts across northern IL/southern WI today before merging into a stronger low pressure of 29.7 inches tracking across Ontario into Saturday. This will result in increasing southerly winds ahead of the system but as the low moves overhead Saturday expect light winds before it pushes out of the area. Expect a brief window of more westerly winds overnight Saturday into Sunday as high pressure around 30.0 inches skirts to the south of Lake Michigan. Southerly winds then return later Sunday into the start of next week as the high pressure slides further east. LMZ080-669-671-673-675-777-779-870-872-874-876-878-111515- Lake Michigan from Michigan City IN to St. Joseph MI 5 NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5 NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake- Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to Mid Lake- 313 AM CDT Fri Jul 11 2025 SHEBOYGAN WI TO PENTWATER MI SOUTH... .TODAY...South winds 10 to 20 kt becoming southwest 10 to 15 kt. Chance of showers and slight chance of thunderstorms this morning, then slight chance of showers and thunderstorms this afternoon. Waves 1 to 3 ft. .TONIGHT...South winds 10 to 15 kt. Chance of showers and thunderstorms. Waves 1 to 3 ft. .SATURDAY...Southwest winds 10 to 20 kt. Chance of showers in the morning, then chance of showers and thunderstorms in the afternoon. Waves 2 to 4 ft. .SATURDAY NIGHT...Southwest winds 10 to 15 kt becoming west. Chance of thunderstorms in the evening. Waves 1 to 3 ft. .SUNDAY...Northwest winds 10 to 15 kt becoming west. Waves 1 to 3 ft. .SUNDAY NIGHT...Southwest winds 5 to 10 kt increasing to 10 to 15 kt. Waves 1 to 2 ft. .MONDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft. .TUESDAY...South winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 3 ft. $$