604
FZUS63 KMKX 050158
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
858 PM 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 as low pressure around 29.6 inches over eastern
North Dakota strengthens to 29.4 inches and lifts northeastward
into Ontario tonight into Sunday. Expect southwesterly winds to
continue throughout tonight, becoming southerly into Sunday
afternoon and strengthening to 25 to 30 kt. Gales are possible in
the northern third of the open waters, with a Gale Watch in effect
from 5 PM CDT Sunday through 2 AM CDT Monday. Winds will diminish
and change to northwesterly as a cold front pushes north to south
across the lake late Sunday night into Monday. A few thunderstorms
are possible with this front. High pressure around 30.4 inches
then settles in Tuesday and Wednesday.

LMZ261-362-364-563-050915-
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 Rock Island Passage to Sturgeon Bay WI-
858 PM CDT Sat Oct 4 2025

STURGEON BAY WI TO POINT BETSIE MI NORTH...

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TONIGHT...South winds 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 6 ft occasionally to 8 ft building to 6 to 9 ft
occasionally to 12 ft.
.SUNDAY NIGHT...South gales to 35 kt becoming southwest to 30 kt.
Chance of showers overnight. Waves 7 to 10 ft occasionally to
13 ft subsiding to 6 to 9 ft occasionally to 12 ft.
.MONDAY...West winds 15 to 25 kt becoming north 10 to 20 kt.
Chance of showers. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 3 to 5 ft.
.MONDAY NIGHT...North winds 10 to 15 kt. Chance of showers in the
evening. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.TUESDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 3 ft building to 2 to 4 ft.
.TUESDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.WEDNESDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Waves 1 ft or less.
.THURSDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 3 to 5 ft.

$$

LMZ366-565-567-868-050915-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
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-
858 PM CDT Sat Oct 4 2025

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO SHEBOYGAN WI TO
PENTWATER MI...

.REST OF TONIGHT...South winds 15 to 25 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.SUNDAY...South winds 10 to 20 kt increasing to 30 kt. Waves 4 to
6 ft occasionally to 8 ft building to 6 to 9 ft occasionally to
12 ft.
.SUNDAY NIGHT...South winds to 30 kt becoming southwest. Waves
7 to 10 ft occasionally to 13 ft.
.MONDAY...West winds 10 to 20 kt veering to north. Showers
likely. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to
5 ft.
.MONDAY NIGHT...North winds 5 to 10 kt increasing to 10 to 15 kt.
Showers likely in the evening, then chance of showers overnight.
Waves 1 to 3 ft.
.TUESDAY...North winds 10 to 20 kt becoming northwest. Waves 2 to
4 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 1 to 3 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt. Waves 1 to 3 ft.
.THURSDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-050915-
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-
858 PM CDT Sat Oct 4 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.SUNDAY...South winds 10 to 20 kt increasing to 30 kt. Waves 3 to
5 ft building to 5 to 8 ft occasionally to 10 ft.
.SUNDAY NIGHT...South winds to 30 kt becoming southwest. Waves
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 increasing to 10 to
20 kt. Showers. Waves 1 to 3 ft building to 2 to 4 ft.
.TUESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of showers in the morning. Waves 4 to 7 ft occasionally to
9 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt becoming northeast.
Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.THURSDAY...Southeast winds 10 to 20 kt becoming south 15 to
25 kt. Waves 4 to 6 ft occasionally to 8 ft.

$$

LMZ761-050915-
MAFOR 0504/
MICHIGAN NORTH 14430 12440 12450. Waves 3 to 5 feet overnight.
Waves 3 to 5 feet building to 5 to 8 feet Sunday. Waves 6 to 9
feet Sunday evening.

MICHIGAN SOUTH 11430 12420 12430 13440. Waves 3 to 5 feet
overnight. Waves 3 to 6 feet building to 5 to 8 feet Sunday.
Waves 5 to 9 feet Sunday evening.

$$


Sheppard

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

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