Expires:202507200930;;743059 FZUS63 KMKX 200146 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 846 PM CDT Sat Jul 19 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... Scattered showers and weak thunderstorms will impact the southern half of Lake Michigan into the evening. Winds will become northerly overnight as a cold front moves across the lake. High pressure of 30 inches will move across Lake Superior on Sunday. Winds will shift to the east on Monday as the high moves into Ontario. Winds will increase to around 20 knots and become southeast on Tuesday as low pressure of 29.5 inches approaches from the central plains. There are chances for storms Wednesday through Friday along a frontal boundary that sets up across the lake. South to southwest winds will remain elevated Wednesday and Thursday ahead of the front. LMZ080-669-671-673-675-777-779-870-872-874-876-878-200930- 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- 846 PM CDT Sat Jul 19 2025 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TONIGHT...Southwest winds 10 to 15 kt veering to north 10 to 20 kt. Slight chance of showers and thunderstorms through early evening. Waves 2 to 4 ft. .SUNDAY...North winds 10 to 20 kt. Chance of showers in the morning, then slight chance of showers in the afternoon. Waves 2 to 4 ft. .SUNDAY NIGHT...North winds 10 to 20 kt becoming east. Waves 2 to 4 ft. .MONDAY...East winds 10 to 20 kt becoming northeast 10 to 15 kt. Waves 2 to 4 ft. .MONDAY NIGHT...Northeast winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 1 to 2 ft building to 2 to 4 ft. .TUESDAY...Southeast winds 10 to 20 kt becoming south. Waves 3 to 5 ft. .TUESDAY NIGHT...South winds 10 to 20 kt. Waves 3 to 5 ft. .WEDNESDAY...South winds 15 to 25 kt. Waves 3 to 5 ft. .THURSDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft. $$