769
FZUS63 KMKX 281359
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
859 AM CDT Thu Aug 28 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...

A trough of low pressure and associated cold front are moving
south across the far southern portions of the lake this morning.
Just slight chances for showers and waterspouts are forecast
through the day. Southwest winds will veer due northerly behind
the front. Breezy northerly winds and building waves are expected
across the entire lake through the evening, then will shift to
northeast and subside.

High pressure around 30.2 inches will then prevail over the Great
Lakes for Friday and the Labor Day weekend. This will bring an
extended period of light and variable winds and quiet weather.


LMZ261-362-364-366-563-565-567-868-282130-
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 AM CDT Thu Aug 28 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...North winds 10 to 20 kt increasing to 15 to 25
kt. Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
.TONIGHT...North winds 15 to 25 kt becoming northeast 10 to
15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.FRIDAY...Northeast winds 5 to 10 kt becoming north 10 to 15 kt.
Waves 2 to 4 ft subsiding to 1 to 2 ft.
.FRIDAY NIGHT...North winds 5 to 10 kt backing to southwest.
Waves 1 ft or less.
.SATURDAY...Southwest winds 10 to 15 kt. Waves 1 ft or less.
.SATURDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 ft or less.
.SUNDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves nearly calm.
.MONDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves nearly calm.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-282130-
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 AM CDT Thu Aug 28 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Winds becoming north 20 to 25 kt. Slight chance
of showers and thunderstorms, including waterspouts. Waves 3 to 5
ft building to 5 to 8 ft occasionally to 10 ft.
.TONIGHT...North winds 15 to 25 kt becoming northeast 10 to
20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to
6 ft occasionally to 8 ft.
.FRIDAY...Northeast winds 10 to 15 kt becoming north. Waves 3 to
5 ft subsiding to 1 to 3 ft.
.FRIDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.SATURDAY...East winds 5 to 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 5 to 10 kt becoming northeast. Waves 1 ft or
less.
.MONDAY...East winds 5 to 10 kt becoming northeast. Waves 1 ft or
less.

$$

LMZ761-282130-
MAFOR 2816/
MICHIGAN NORTH 11830 11830 11830 12120 11110 12100. Waves 3 to 6
feet building to 4 to 7 feet this afternoon. Waves 4 to 7 feet
subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet Friday
morning.

MICHIGAN SOUTH 11830 11830 12830 11130 11120 11110 11100. A
chance of waterspouts late this morning. Waves 2 to 4 feet
building to 4 to 7 feet this afternoon. Waves 4 to 7 feet
subsiding to 3 to 6 feet tonight. Waves 3 to 5 feet subsiding to 2
to 4 feet Friday morning.

$$


Gehring

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

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