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National Weather Service Marine Forecast FZUS63 KMKX

FZUS63 KMKX 121503
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
903 AM CST Mon Jan 12 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

29.4 inch low pressure is centered over the eastern Hudson Bay this afternoon, resulting in generally west-southwest winds across the open waters of Lake Michigan. High pressure of 29.9 inches will cross the waters this evening, bringing a decrease in winds through the first half of the overnight hours. Low pressure of 29.3 inches will develop near the Ontario-Manitoba border late tonight, deepening to near 29.2 inches as it approaches the Ontario-Quebec border Tuesday evening. Development and progression of the low will result in increasing west-southwest winds across Lake Michigan early Tuesday morning through Tuesday afternoon. Gusts between 25-30 knots are possible, though gales are not expected at this time.

An Arctic cold front will quickly move south across Lake Michigan late Tuesday night through early Wednesday morning, bringing a gusty north wind shift over the waters. Gale force gusts appear possible during this time frame, with the need for headlines being assessed in coming forecasts. Areas of light to moderate freezing spray will accompany the passing front Wednesday morning through Wednesday evening.

LMZ261-362-364-366-563-565-567-868-122215
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
903 AM CST Mon Jan 12 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

REST OF TODAY
West 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.

TONIGHT
Southwest winds 10 to 20 kt increasing to 15 to 25 kt. Chance of rain overnight. Waves 2 to 4 ft building to 3 to 5 ft.

TUESDAY
Southwest winds 15 to 25 kt becoming west. Rain likely with snow in the morning, then chance of rain in the afternoon. Waves 4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally to 12 ft.

TUESDAY NIGHT
West winds 10 to 20 kt becoming northwest to 30 kt overnight. Chance of snow in the evening, then chance of snow and rain overnight. Waves 4 to 7 ft occasionally to 9 ft building to 7 to 10 ft occasionally to 13 ft.

WEDNESDAY
North gales to 35 kt increasing to gales to 40 kt. Freezing spray. Chance of snow. Waves 12 to 16 ft occasionally to 21 ft.

WEDNESDAY NIGHT
North gales to 35 kt diminishing to 30 kt. Freezing spray. Waves 10 to 14 ft occasionally to 18 ft subsiding to 8 to 11 ft occasionally to 14 ft.

THURSDAY
North winds 10 to 20 kt becoming west 10 to 15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.

FRIDAY
South winds 10 to 20 kt. Chance of snow. Waves 4 to 6 ft occasionally to 8 ft.

LMZ080-669-671-673-675-777-779-870-872-874-876-878-122215
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
903 AM CST Mon Jan 12 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

REST OF TODAY
West winds 15 to 25 kt becoming southwest 10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft.

TONIGHT
Southwest winds 10 to 20 kt increasing to 15 to 25 kt. Chance of rain overnight. Waves 4 to 6 ft occasionally to 8 ft.

TUESDAY
Southwest winds to 30 kt becoming west 15 to 25 kt. Chance of rain. Waves 7 to 10 ft occasionally to 13 ft.

TUESDAY NIGHT
West winds 10 to 20 kt becoming northwest to 30 kt overnight. Chance of rain and snow overnight. Waves 6 to 9 ft occasionally to 12 ft.

WEDNESDAY
North gales to 35 kt increasing to gales to 40 kt. Snow and rain in the morning, then snow in the afternoon. Waves 12 to 16 ft occasionally to 21 ft.

WEDNESDAY NIGHT
North gales to 35 kt diminishing to 30 kt. Freezing spray. Chance of snow. Waves 12 to 16 ft occasionally to 21 ft.

THURSDAY
North winds 15 to 25 kt becoming northwest 10 to 20 kt. Waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft occasionally to 9 ft.

FRIDAY
Southwest winds 10 to 20 kt. Snow likely. Waves 4 to 7 ft occasionally to 9 ft.

LMZ761-122215
MAFOR 1217/ MICHIGAN NORTH 11630 12620 12520 11530 11536 11537. Waves 3 to 5 feet subsiding to 2 to 4 feet this afternoon. Waves 2 to 4 feet building to 3 to 5 feet tonight. Waves 5 to 8 feet Tuesday morning.

MICHIGAN SOUTH 11530 14520 13530. A chance of rain overnight and Tuesday morning. Waves 4 to 7 feet subsiding to 3 to 6 feet this afternoon. Waves 2 to 4 feet building to 3 to 5 feet tonight. Waves 5 to 9 feet Tuesday morning.

Quigley

Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable

Graphical marine forecasts are available online at: weather.gov/greatlakes