255 FZUS63 KMKX 160911 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 411 AM CDT Fri Oct 16 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... Low pressure of 29.7 inches over northeast IL will deepen to around 29.4 inches as it shifts into the eastern Great Lakes through today. Expect a northerly wind shift tonight to increase to high-end gales by late this morning as the low departs while a strong high pressure around 30.7 inches builds into the Plains. A Gale Warning remains in effect for all of the open waters of Lake Michigan later this morning into tonight. Light rain will continue over the north half overnight, with intermittent rain over the south half. Lake effect showers and a few thunderstorms are possible today along the back side of departing low pressure. A few waterspouts are possible in the showers/thunderstorms, particularly over the south half of Lake Michigan. As the high sinks toward the Ohio River Valley on Saturday, strong low pressure around 29.0 inches will develop in northern Manitoba through the weekend. The tight pressure gradient may bring southwest gales to Lake Michigan on Sunday, primarily over the north half. LMZ261-362-364-366-563-565-567-868-161515- 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- 411 AM CDT Fri Oct 16 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... ...GALE WARNING IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH LATE TONIGHT... .TODAY...North winds to 30 kt increasing to gales to 45 kt. Rain showers likely this morning, then slight chance of rain showers this afternoon. Slight chance of waterspouts this afternoon. Waves 7 to 10 ft occasionally to 13 ft building to 12 to 16 ft occasionally to 21 ft. .TONIGHT...North gales to 40 kt becoming northwest 10 to 20 kt. Waves 12 to 16 ft occasionally to 21 ft subsiding to 5 to 8 ft occasionally to 10 ft. .SATURDAY...Northwest winds 10 to 15 kt becoming west 15 to 25 kt late in the morning, then becoming southwest to 30 kt early in the afternoon increasing to gales to 35 kt late. Waves 3 to 5 ft building to 5 to 8 ft occasionally to 10 ft. .SATURDAY NIGHT...Southwest gales to 35 kt. Waves 6 to 9 ft occasionally to 12 ft building to 8 to 11 ft occasionally to 14 ft. .SUNDAY...Southwest gales to 40 kt. Waves 10 to 14 ft occasionally to 18 ft. .SUNDAY NIGHT...Southwest gales to 40 kt. Waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to 10 ft occasionally to 13 ft. .MONDAY...Southwest winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. .TUESDAY...East winds 5 to 10 kt. Waves 1 to 2 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-161515- 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- 411 AM CDT Fri Oct 16 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... ...GALE WARNING IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH LATE TONIGHT... .TODAY...Northwest winds to 30 kt becoming north gales to 45 kt. Slight chance of waterspouts. Chance of showers this morning, then chance of showers and slight chance of thunderstorms this afternoon. Waves 8 to 12 ft occasionally to 16 ft building to 14 to 18 ft occasionally to 23 ft. .TONIGHT...North gales to 40 kt diminishing to 15 to 25 kt. Slight chance of waterspouts in the evening. Chance of rain showers in the evening, then slight chance of rain showers overnight. Waves 14 to 18 ft occasionally to 23 ft subsiding to 8 to 12 ft occasionally to 16 ft. .SATURDAY...North winds 10 to 20 kt becoming northwest 10 to 15 kt late in the morning, then becoming southwest 10 to 20 kt early in the afternoon increasing to 30 kt late. Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to 6 ft occasionally to 8 ft. .SATURDAY NIGHT...Southwest winds to 30 kt. Waves 6 to 9 ft occasionally to 12 ft. .SUNDAY...Southwest winds to 30 kt. Waves 8 to 12 ft occasionally to 16 ft. .SUNDAY NIGHT...South winds to 30 kt becoming southwest 15 to 25 kt. Waves 8 to 11 ft occasionally to 14 ft subsiding to 5 to 8 ft occasionally to 10 ft. .MONDAY...Southwest winds 10 to 20 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft. .TUESDAY...East winds 5 to 10 kt. Waves 1 ft or less. $$ LMZ761-161515- MAFOR 1610/ MICHIGAN NORTH...GALE WARNING IN EFFECT...12846 11850 11860 12850 11840 11830. Waves 3 to 6 feet building to 10 to 15 feet today. Waves 10 to 15 feet subsiding to 4 to 7 feet tonight. MICHIGAN SOUTH...GALE WARNING IN EFFECT...12740 11756 11866 11860 12850 11830. Waves 8 to 11 feet building to 13 to 17 feet today. Waves 13 to 18 feet subsiding to 9 to 12 feet tonight. $$ Kuroski Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes