FZUS63 KMKX 090143 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 843 PM CDT Wed Jul 8 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 30.0 inches will remain over the Ohio River Valley through tonight. Light south winds will continue tonight, as weak low pressure around 29.8 inches and an accompanying cold front approaches from Upper Michigan and northwest Wisconsin. Light winds will become north behind the frontal passage Thursday into Thursday night. Winds will become north to northeast on Friday, as high pressure around 30.0 inches builds into the the region from the northwest. The high should continue to bring light to modest winds for the weekend. LMZ261-362-364-366-868-090915- 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 Pentwater to Manistee MI 5 NM offshore to Mid Lake- 843 PM CDT Wed Jul 8 2026 ROCK ISLAND PASSAGE TO CHARLEVOIX MI NORTH... .REST OF TONIGHT...Southwest winds 10 to 15 kt diminishing to 5 to 10 kt. Patchy fog. Showers likely with a chance of thunderstorms. Waves 1 to 2 ft. .THURSDAY...North winds 10 to 15 kt becoming northwest. Patchy fog in the morning. Chance of showers and slight chance of thunderstorms in the morning. Waves 1 to 2 ft. .THURSDAY NIGHT...Northwest winds 10 to 15 kt becoming north 5 to 10 kt. Waves 1 to 2 ft. .FRIDAY...North winds 10 to 15 kt increasing to 15 to 25 kt in the afternoon. Waves 1 to 2 ft building to 1 to 3 ft. .FRIDAY NIGHT...Northeast winds 10 to 20 kt becoming east 5 to 10 kt overnight. Waves 1 to 3 ft subsiding to 1 to 2 ft. .SATURDAY...East winds 5 to 10 kt backing to north 10 to 20 kt in the afternoon. Waves 1 to 2 ft. .SATURDAY NIGHT...East winds 10 to 20 kt veering to south 10 to 15 kt. Waves 1 to 2 ft. .SUNDAY...Southwest winds 10 to 20 kt. Waves 1 to 3 ft. .MONDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt. Waves 1 to 3 ft. $$ LMZ563-565-567-090915- Lake Michigan from Rock Island Passage to Sturgeon Bay WI- Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to Mid Lake- 843 PM CDT Wed Jul 8 2026 ROCK ISLAND PASSAGE TO CHARLEVOIX MI SOUTH TO SHEBOYGAN WI TO PENTWATER MI... ...SEVERE THUNDERSTORM WATCH 471 IN EFFECT UNTIL 10 PM CDT THIS EVENING... .REST OF TONIGHT...South winds 10 to 15 kt becoming southwest 5 to 10 kt. Patchy fog. Showers likely with a chance of thunderstorms. with damaging winds and large hail through early evening. Waves 1 to 2 ft. .THURSDAY...Southwest winds 5 to 10 kt veering to north 10 to 15 kt. Patchy fog in the morning. Chance of showers and slight chance of thunderstorms in the morning, then slight chance of showers in the afternoon. Waves 1 to 2 ft. .THURSDAY NIGHT...North winds 5 to 10 kt. Waves 1 to 2 ft. .FRIDAY...Northeast winds 10 to 15 kt. Waves 1 to 2 ft. .FRIDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to 10 kt. Waves 1 to 2 ft. .SATURDAY...East winds 5 to 10 kt becoming northeast. Waves 1 ft or less. .SATURDAY NIGHT...East winds 5 to 10 kt veering to south. Waves nearly calm. .SUNDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft. .MONDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 2 ft. $$ LMZ080-671-673-675-777-779-870-872-874-876-878-090915- Lake Michigan from Michigan City IN to St. Joseph MI 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- 843 PM CDT Wed Jul 8 2026 PORT WASHINGTON WI TO WHITEHALL MI SOUTH... .REST OF TONIGHT...South winds 10 to 15 kt diminishing to 5 to 10 kt. Chance of showers and thunderstorms through early evening, then chance of showers and slight chance of thunderstorms overnight. Waves 1 to 2 ft. .THURSDAY...South winds 10 to 15 kt. Chance of showers and slight chance of thunderstorms in the morning, then chance of showers and thunderstorms in the afternoon. Waves 1 ft or less. .THURSDAY NIGHT...North winds 10 to 15 kt diminishing to 5 to 10 kt. Chance of thunderstorms in the evening. Waves 1 to 2 ft. .FRIDAY...North winds 10 to 15 kt increasing to 15 to 25 kt in the afternoon. Waves 1 to 3 ft building to 2 to 4 ft. .FRIDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to 15 kt overnight. Waves 2 to 4 ft. .SATURDAY...East winds 10 to 15 kt becoming north 10 to 20 kt. Waves 1 to 3 ft. .SATURDAY NIGHT...Northeast winds 10 to 20 kt becoming east 5 to 10 kt. Waves 1 to 2 ft. .SUNDAY...Southeast winds 5 to 10 kt becoming east. Waves 1 ft or less. .MONDAY...West winds 10 to 15 kt becoming southwest 10 to 20 kt. Waves 1 to 2 ft. $$ LMZ669-090915- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- 843 PM CDT Wed Jul 8 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH TO PORT WASHINGTON WI TO WHITEHALL MI... ...SEVERE THUNDERSTORM WATCH 471 IN EFFECT UNTIL 10 PM CDT THIS EVENING... .REST OF TONIGHT...South winds 10 to 15 kt diminishing to 5 to 10 kt. Showers with a chance of thunderstorms through early evening, then showers likely with a chance of thunderstorms overnight. Patchy fog overnight. with damaging winds and large hail through early evening. Waves 1 to 2 ft. .THURSDAY...South winds 5 to 10 kt backing to northeast 10 to 15 kt. Patchy fog in the morning. Chance of showers and slight chance of thunderstorms in the morning, then slight chance of showers and thunderstorms in the afternoon. Waves 1 ft or less. .THURSDAY NIGHT...Northeast winds 5 to 10 kt becoming north 10 to 15 kt. Waves 1 to 2 ft. .FRIDAY...North winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 3 ft. .FRIDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to 15 kt. Waves 1 to 3 ft. .SATURDAY...Northeast winds 5 to 10 kt. Waves 1 to 2 ft. .SATURDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves 1 ft or less. .SUNDAY...South winds 5 to 10 kt increasing to 10 to 15 kt. Waves 1 ft or less. .MONDAY...West winds 5 to 10 kt becoming south 10 to 15 kt. Waves 1 ft or less. $$ LMZ761-090915- MAFOR 0904/ MICHIGAN NORTH 11516 11506 11510 14810 11810. A chance of thunderstorms overnight. Waves 2 feet or less. MICHIGAN SOUTH 12400 11410 12510 11410 12810. A chance of showers and thunderstorms late this evening, then a chance of showers overnight. A chance of showers Thursday. A chance of thunderstorms Thursday evening. Waves 2 feet or less. $$ DDV Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes