FZUS63 KMKX 160207 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 907 PM CDT Thu Oct 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... 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 Friday. Expect a northerly wind shift tonight to increase to high-end gales by late Friday 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 Friday morning into Friday night. 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 Friday along the back side of departing low pressure. A few waterspouts are possible in the Friday 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. LMZ261-362-364-366-563-565-567-868-160930- 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- 907 PM CDT Thu Oct 15 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... ...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT... .REST OF TONIGHT...Southeast winds 10 to 20 kt becoming east late this evening, then becoming north 15 to 25 kt after midnight and increasing to 30 kt late. Showers. Slight chance of waterspouts overnight. Waves 2 to 4 ft building to 5 to 8 ft occasionally to 10 ft. .FRIDAY...North winds to 30 kt increasing to gales to 45 kt. Slight chance of waterspouts. Showers in the morning, then chance of showers in the afternoon. Waves 7 to 10 ft occasionally to 13 ft building to 14 to 18 ft occasionally to 23 ft. .FRIDAY NIGHT...North gales to 40 kt becoming northwest winds 10 to 20 kt. Waves 14 to 18 ft occasionally to 23 ft subsiding to 6 to 9 ft occasionally to 12 ft. .SATURDAY...West winds 15 to 25 kt becoming southwest to 30 kt. Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to 10 ft. .SATURDAY NIGHT...Southwest gales to 35 kt increasing to gales to 40 kt. Waves 6 to 9 ft occasionally to 12 ft building to 8 to 12 ft occasionally to 16 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 2 to 4 ft. .TUESDAY...Northeast winds 5 to 10 kt becoming east. Waves 1 to 2 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-160930- 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- 907 PM CDT Thu Oct 15 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... ...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY NIGHT... .REST OF TONIGHT...South winds 15 to 25 kt becoming southwest late this evening, then becoming west to 30 kt after midnight. Chance of showers. Slight chance of waterspouts overnight. Waves 2 to 4 ft building to 8 to 12 ft occasionally to 16 ft. .FRIDAY...Northwest gales to 35 kt becoming north gales to 40 kt early in the afternoon, then increasing to gales to 45 kt late. Slight chance of waterspouts. Chance of showers in the morning, then showers in the afternoon. Waves 10 to 14 ft occasionally to 18 ft building to 18 to 23 ft occasionally to 30 ft. .FRIDAY NIGHT...North gales to 45 kt diminishing to 30 kt. Chance of rain showers in the evening. Waves 18 to 23 ft occasionally to 30 ft subsiding to 10 to 14 ft occasionally to 18 ft. .SATURDAY...North winds 10 to 20 kt backing to southwest 15 to 25 kt. Waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 6 ft occasionally to 8 ft. .SATURDAY NIGHT...Southwest winds to 30 kt. Waves 7 to 10 ft occasionally to 13 ft. .SUNDAY...Southwest winds to 30 kt with a few gale force gusts up to 35 kt. Waves 10 to 14 ft occasionally to 18 ft. .SUNDAY NIGHT...Southwest winds to 30 kt diminishing to 15 to 25 kt. Waves 8 to 12 ft occasionally to 16 ft subsiding to 6 to 9 ft occasionally to 12 ft. .MONDAY...Southwest winds 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. .TUESDAY...Southwest winds 5 to 10 kt backing to southeast. Waves 1 to 2 ft. $$ LMZ761-160930- MAFOR 1604/ MICHIGAN NORTH...GALE WARNING IN EFFECT...11126 12846 11856 11850 12860 11850. Waves 1 to 3 feet building to 4 to 7 feet overnight. Waves 6 to 9 feet building to 13 to 17 feet Friday. Waves 13 to 17 feet subsiding to 11 to 15 feet Friday evening. MICHIGAN SOUTH...GALE WARNING IN EFFECT...11640 11740 12750 11756 12866 11850. Waves 2 to 4 feet building to 8 to 11 feet overnight. Waves 9 to 12 feet building to 16 to 21 feet Friday. Waves 16 to 21 feet subsiding to 15 to 20 feet Friday evening. $$ Cronce Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes