455
FZUS63 KMKX 300159
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
859 PM CDT Mon Sep 29 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...

Light and variable winds expected overnight as high pressure
around 30.2 inches lingers over the Great Lakes Region. Patchy
fog is possible over far northern and western portions of the lake
later in the overnight hours. A second area of 30.4 inch high
pressure will drift through Ontario overnight through Tuesday,
allowing east- northeast winds to become established over Lake
Michigan. The high will strengthen to near 30.5 inches as it
settles along the Ontario- Quebec border Tuesday night through
Wednesday, maintaining generally easterly winds. The high will
advance into the northeastern United States through the end of the
week, allowing winds to turn out of the south Thursday through
Friday. Broad low pressure will form over the northern Great
Plains Saturday, and will gradually attempt to work toward the
upper Mississippi River Valley by the end of next weekend. Chances
for isolated showers and thunderstorms return to the forecast
Saturday evening through Monday.

LMZ261-362-364-366-563-565-567-868-300915-
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-
859 PM CDT Mon Sep 29 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds 5 to 10 kt backing to east. Waves
1 ft or less.
.TUESDAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt.
Patchy dense fog in the morning. Waves 1 to 3 ft building to 2 to
4 ft.
.TUESDAY NIGHT...Northeast winds 15 to 25 kt becoming east 10 to
20 kt. Waves 2 to 4 ft.
.WEDNESDAY...Southeast winds 10 to 20 kt becoming east. Waves
2 to 4 ft.
.WEDNESDAY NIGHT...East winds 10 to 20 kt becoming southeast.
Waves 1 to 3 ft building to 3 to 5 ft.
.THURSDAY...South winds 10 to 20 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south. Waves
3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-300915-
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-
859 PM CDT Mon Sep 29 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Northeast winds less than 10 kt increasing to
5 to 10 kt. Waves nearly calm.
.TUESDAY...Northeast winds 5 to 10 kt becoming north. Waves 1 to
2 ft.
.TUESDAY NIGHT...Northeast winds 10 to 20 kt becoming east. Waves
1 to 3 ft building to 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...East 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.
.WEDNESDAY NIGHT...East winds 10 to 20 kt becoming southeast.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...Southeast winds 10 to 15 kt becoming south.
Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south. Waves
3 to 5 ft.

$$

LMZ761-300915-
MAFOR 3004/
MICHIGAN NORTH 12200 11220 19224 11220 13130 11220. Waves 1 foot
or less overnight. Waves 1 to 3 feet building to 2 to 4 feet
Tuesday. Waves 2 to 4 feet subsiding to 1 to 3 feet Tuesday
evening.

MICHIGAN SOUTH 14100 11100 12810 11120. Waves 1 foot or less
overnight and Tuesday. Waves 1 to 3 feet Tuesday 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