412
FZUS63 KMKX 041408
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
908 AM CDT Sat Oct 4 2025

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...

Broad high pressure around 30.4 inches lingers along the Mid-
Atlantic coast, with developing low pressure across the Central
Plains this weekend. Southerly winds will therefore increase
across the open waters through this afternoon. Low pressure
deepens to around 29.4 inches as it lifts across the Northern
Plains into Ontario on Sunday, bringing widespread southerly
gusts of 20-30 knots. A brief potential for gale force gusts
across the northern third of the Lake Michigan later Sunday
evening still exists. Given the brevity of the window for gales
right around 35 knots, will continue to hold off on any gale
headlines at this time, but will continue to monitor. The cold
front extending off of the northern low pressure system will trek
across the lake on Monday, bringing lighter winds shifting from
west to northwesterly. High pressure then settles in for the
middle of the week.

LMZ261-362-364-366-563-565-567-868-042115-
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-
908 AM CDT Sat Oct 4 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 2 to 4 ft building to 3 to 5 ft.
.TONIGHT...South winds to 30 kt diminishing to 15 to 25 kt. Waves
4 to 6 ft occasionally to 8 ft.
.SUNDAY...South winds 15 to 25 kt increasing to gales to 35 kt.
Waves 4 to 7 ft occasionally to 9 ft building to 8 to 11 ft
occasionally to 14 ft.
.SUNDAY NIGHT...South gales to 35 kt becoming southwest. Waves
8 to 11 ft occasionally to 14 ft subsiding to 7 to 10 ft
occasionally to 13 ft.
.MONDAY...West winds 15 to 25 kt becoming north 10 to 20 kt.
Showers likely. Waves 5 to 8 ft occasionally to 10 ft subsiding
to 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...North winds 10 to 15 kt. Chance of showers. Waves
1 to 3 ft.
.TUESDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt becoming north. Waves
1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-042115-
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-
908 AM CDT Sat Oct 4 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 2 to 4 ft building to 3 to 5 ft.
.TONIGHT...South winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 3 to 5 ft.
.SUNDAY...South winds 10 to 20 kt increasing to 30 kt. Waves 3 to
5 ft building to 7 to 10 ft occasionally to 13 ft.
.SUNDAY NIGHT...South winds to 30 kt. Waves 7 to 10 ft
occasionally to 13 ft subsiding to 6 to 9 ft occasionally to
12 ft.
.MONDAY...Southwest winds 15 to 25 kt becoming west 10 to 20 kt.
Chance of showers. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...North winds 10 to 15 kt becoming northwest 10 to
20 kt. Showers. Waves 2 to 4 ft.
.TUESDAY...North winds 10 to 20 kt. Chance of showers. Waves 4 to
6 ft occasionally to 8 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.

$$

LMZ761-042115-
MAFOR 0416/
MICHIGAN NORTH 11420 15430 11430. Waves 1 to 3 feet building to 2
to 4 feet this afternoon. Waves 3 to 5 feet tonight and Sunday
morning.

MICHIGAN SOUTH 11420 14430 12420 11430. Waves 1 to 3 feet
building to 2 to 4 feet this afternoon. Waves 3 to 6 feet tonight
and Sunday morning.

$$


MH

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

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