FZUS63 KMKX 071947 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 247 PM CDT Tue Jul 7 2026 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... High pressure around 30.1 inches over Lake MI and lower MI will shift southeast into the lower Great Lakes and the Ohio Valley for Wednesday. Expect light south winds over the northern portions of the lake this afternoon, with light and variable winds to the south. Modest south southwest winds will then develop tonight and continue on Wednesday, as weak low pressure around 29.8 inches and an accompanying cold front approaches from the Northern Great Plains. Modest southwest winds Wednesday night will become northwest to north behind the frontal passage Thursday into Friday, with high pressure around 30.0 inches building into the the Upper Great Lakes region. LMZ261-362-364-366-563-565-567-868-080430- Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and north of a line from Charlevoix MI to South Fox Island 5 NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to Mid Lake- Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI- Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to Mid Lake- Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid Lake- 247 PM CDT Tue Jul 7 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .TONIGHT...Southwest winds 10 to 15 kt becoming south. Slight chance of showers and thunderstorms overnight. Waves 1 to 2 ft. .WEDNESDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt. Chance of showers and slight chance of thunderstorms. Waves 1 to 3 ft. .WEDNESDAY NIGHT...Southeast winds 10 to 20 kt backing to north 10 to 15 kt. Showers likely with a chance of thunderstorms in the evening, then chance of showers overnight. Waves 1 to 3 ft. .THURSDAY...North winds 10 to 15 kt increasing to 10 to 20 kt. Chance of showers in the morning. Waves 1 to 3 ft. .THURSDAY NIGHT...North winds 10 to 15 kt diminishing to 5 to 10 kt. Waves 1 to 3 ft. .FRIDAY...Northeast winds 10 to 15 kt becoming north 15 to 25 kt in the afternoon. Waves 1 to 3 ft. .FRIDAY NIGHT...Northeast winds 10 to 20 kt becoming east 5 to 10 kt. Waves 1 to 3 ft. .SATURDAY...Southeast winds 5 to 10 kt veering to west 10 to 20 kt. Waves 1 ft or less. .SUNDAY...Southwest winds 10 to 20 kt. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-080430- Lake Michigan from Michigan City IN to St. Joseph MI 5 NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5 NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake- Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to Mid Lake- 247 PM CDT Tue Jul 7 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .TONIGHT...Southwest winds 5 to 10 kt. Waves 1 ft or less. .WEDNESDAY...Southwest winds 5 to 10 kt becoming south 10 to 20 kt. Waves 1 to 3 ft. .WEDNESDAY NIGHT...South winds 10 to 20 kt becoming southwest. Chance of showers. Waves 1 to 3 ft. .THURSDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt. Chance of showers in the morning, then chance of showers and thunderstorms in the afternoon. Waves 1 to 3 ft. .THURSDAY NIGHT...North winds 10 to 15 kt. Chance of showers and thunderstorms in the evening, then chance of showers overnight. Waves 1 to 2 ft. .FRIDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt. Waves 1 to 3 ft. .FRIDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to 15 kt. Waves 1 to 3 ft. .SATURDAY...East winds 5 to 10 kt becoming north 10 to 20 kt. Waves 1 to 2 ft. .SUNDAY...Northeast winds 5 to 10 kt backing to southwest 10 to 20 kt. Waves 1 to 2 ft. $$ LMZ761-080430- MAFOR 0722/ MICHIGAN NORTH 12510 12410 12510 11420 11520. A chance of showers Wednesday. Waves 2 feet or less. MICHIGAN SOUTH 12500 12400 11500 11510 12420. Waves 2 feet or less. $$ Gehring Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes