901
FZUS63 KMKX 291957
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
257 PM CDT Fri Aug 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...

High pressure of 30.2 inches centered over Lake Michigan will
drift east into Michigan through Saturday and linger across the
Great Lakes through the early part of next week. Low pressure of
29.7 inches is expected to develop across Ontario and pull a
strong cold front from north to south across Lake Michigan on
Wednesday, bringing a gusty northwest wind shift to all of lake.
Gusty northwest winds will continue through most of Thursday
with gusts near or just below gale force next Wednesday-Thursday
across the open waters.

LMZ261-362-364-366-563-565-567-868-300315-
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-
257 PM CDT Fri Aug 29 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northeast winds 5 to 10 kt backing to northwest. Waves
1 ft or less.
.SATURDAY...Southwest winds less than 10 kt increasing to 5 to
10 kt. Waves 1 ft or less.
.SATURDAY NIGHT...Southwest winds 5 to 10 kt diminishing to less
than 10 kt. Waves 1 ft or less.
.SUNDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves nearly calm.
.SUNDAY NIGHT...South winds 5 to 10 kt. Waves nearly calm.
.MONDAY...South winds 5 to 10 kt becoming southwest. Waves nearly
calm.
.MONDAY NIGHT...South winds 5 to 10 kt. Waves nearly calm.
.TUESDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.WEDNESDAY...West winds 10 to 20 kt becoming northwest 15 to
25 kt. Chance of showers. Waves 2 to 4 ft building to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-300315-
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-
257 PM CDT Fri Aug 29 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northeast winds 5 to 10 kt becoming east. Slight
chance of showers and thunderstorms this evening. Waves 1 to
2 ft.
.SATURDAY...East winds less than 10 kt becoming northeast. Waves
1 ft or less.
.SATURDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 ft or less.
.SUNDAY...East winds less than 10 kt becoming northeast. Waves
1 ft or less.
.SUNDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 ft or less.
.MONDAY...Southeast winds 5 to 10 kt becoming east. Waves 1 ft or
less.
.MONDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 ft or less.
.TUESDAY...Southeast winds 5 to 10 kt becoming south. Waves 1 ft
or less.
.WEDNESDAY...West winds 10 to 20 kt becoming northwest 15 to
25 kt. Chance of showers. Waves 2 to 4 ft building to 4 to 6 ft
occasionally to 8 ft.

$$

LMZ761-300315-
MAFOR 2922/
MICHIGAN NORTH 11100 11200 12300 12500 12600. Waves 1 foot or
less.

MICHIGAN SOUTH 11106 12100 14200 11100. Waves 2 feet or less.

$$


Halbach

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

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