FZUS63 KMKX 150749 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 249 AM CDT Wed Apr 15 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... A stationary front will remain parked over the middle third of the lake into this afternoon, slowly sinking south to the southern end of the lake by Thursday morning. Winds will remain southerly south of the front and modestly breezy, while winds north of the front will remain light and variable to northerly during this time. The front will clear the lake as a cold front Friday, before low pressure of 29.6 inches approaches from the west. Marine dense fog will continue through daybreak. Will be monitoring for potential extensions to the dense fog advisory if conditions warrant this morning. Additional thunderstorms are forecast over the southern third of Lake Michigan today. A few storms could be severe with large hail being the primary concern. Additional storms are possible Friday into Saturday, with a few stronger storms possible. LMZ261-362-364-366-563-565-567-868-151530- 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- 249 AM CDT Wed Apr 15 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT THIS MORNING... .TODAY...North winds 5 to 10 kt increasing to 10 to 15 kt. Areas of dense fog this morning, then patchy dense fog this afternoon. Slight chance of rain showers. Waves 1 to 3 ft. .TONIGHT...Northeast winds 5 to 10 kt increasing to 10 to 15 kt. Patchy dense fog in the evening. Chance of rain showers and thunderstorms in the evening, then chance of rain showers and slight chance of thunderstorms overnight. Waves 1 to 2 ft. .THURSDAY...Northeast winds 10 to 20 kt becoming north 10 to 15 kt. Chance of rain showers. Waves 1 to 2 ft. .THURSDAY NIGHT...North winds 5 to 10 kt becoming northeast. Waves 1 to 2 ft. .FRIDAY...Southeast winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 2 ft building to 3 to 5 ft. .FRIDAY NIGHT...Southeast winds 15 to 25 kt becoming south to 30 kt. Rain showers. Waves 4 to 7 ft occasionally to 9 ft. .SATURDAY...South winds to 30 kt becoming southwest. Chance of rain showers. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY...Northwest winds to 30 kt. Waves 7 to 10 ft occasionally to 13 ft. $$ LMZ669-671-870-872-151530- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- 249 AM CDT Wed Apr 15 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH TO NORTH POINT LIGHT WI TO GRAND HAVEN MI... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT THIS MORNING... .TODAY...Southwest winds 15 to 25 kt diminishing to 10 to 20 kt late this morning, then becoming west early this afternoon veering to northeast 10 to 15 kt late. Areas of dense fog. Chance of rain showers and slight chance of thunderstorms. Waves 2 to 4 ft. .TONIGHT...East winds 10 to 15 kt. Patchy dense fog in the evening. Rain showers likely with a chance of thunderstorms in the evening, then rain showers with a chance of thunderstorms overnight. Waves 1 to 3 ft. .THURSDAY...East winds 10 to 15 kt backing to northwest. Rain showers likely with a chance of thunderstorms in the morning, then chance of rain showers in the afternoon. Waves 1 to 2 ft. .THURSDAY NIGHT...North winds 5 to 10 kt. Waves 1 to 2 ft. .FRIDAY...Southeast winds 5 to 10 kt becoming south 10 to 20 kt in the afternoon. Waves 1 to 2 ft building to 3 to 5 ft. .FRIDAY NIGHT...Southeast winds 15 to 25 kt becoming south to 30 kt. Rain showers with a chance of thunderstorms. Waves 4 to 7 ft occasionally to 9 ft. .SATURDAY...South winds to 30 kt becoming southwest. Chance of rain showers. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY...West winds to 30 kt becoming northwest. Waves 8 to 11 ft occasionally to 14 ft. $$ LMZ080-673-675-777-779-874-876-878-151530- Lake Michigan from Michigan City IN to St. Joseph MI 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 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- 249 AM CDT Wed Apr 15 2026 NORTH POINT LIGHT WI TO GRAND HAVEN MI SOUTH... .TODAY...Southwest winds 15 to 25 kt becoming south 10 to 20 kt. Areas of dense fog this morning, then patchy dense fog this afternoon. Rain showers likely with slight chance of thunderstorms this morning, then chance of rain showers and thunderstorms this afternoon. Waves 2 to 4 ft. .TONIGHT...South winds 10 to 15 kt. Patchy dense fog in the evening. Rain showers likely with a chance of thunderstorms in the evening, then rain showers with a chance of thunderstorms overnight. Waves 1 to 3 ft. .THURSDAY...Southwest winds 10 to 20 kt veering to northwest 10 to 15 kt. Rain showers likely with a chance of thunderstorms. Waves 1 to 3 ft. .THURSDAY NIGHT...Northwest winds 5 to 10 kt becoming north. Waves 1 to 2 ft. .FRIDAY...Southeast winds 5 to 10 kt increasing to 10 to 20 kt in the afternoon. Waves 1 to 2 ft building to 2 to 4 ft. .FRIDAY NIGHT...Southeast winds 15 to 25 kt becoming south. Showers with a chance of thunderstorms. Waves 4 to 6 ft occasionally to 8 ft. .SATURDAY...South winds 15 to 25 kt becoming west. Chance of rain showers. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY...West winds to 30 kt becoming northwest. Waves 8 to 11 ft occasionally to 14 ft. $$ LMZ761-151530- MAFOR 1510/ MICHIGAN NORTH 11814 11804 12810 19814 11110 19114 12100 11110. A chance of rain showers and thunderstorms this evening, then a chance of rain showers overnight. Waves 2 feet or less. MICHIGAN SOUTH 11534 11536 19534 11510 19514 11420 19424 11416 19414 12316 11310. A chance of thunderstorms early this morning. A chance of thunderstorms this afternoon. A chance of thunderstorms tonight. Waves 1 to 3 feet. $$ Quigley Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes