304
FZUS63 KMKX 301354
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
854 AM CDT Sat Aug 30 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...

30.1 inch high pressure will remain in place across Lake Michigan
through Monday, with light and variable winds across the lake.
South-southwest winds will develop Tuesday afternoon as low
pressure of 29.8 inches progresses from Ontario toward Lake
Superior. Winds will increase through the overnight hours as low
pressure makes its closest approach. A cold front will progress
west to east across Lake Michigan Wednesday morning as low
pressure progresses toward Quebec, with thunderstorms expected
along the front.

Expect northwesterly winds behind the front, with gusty
conditions developing by the afternoon hours Wednesday. While the
current forecast continues to keep gusts just below gale
thresholds, upward trends are possible as this portion of the
period draws closer. Breezy northwest winds will continue through
the day on Thursday behind the departed cold front. Showers will
continue after the frontal passage. It remains too early to
definitively indicate if gusty thunderstorm winds or waterspouts
will be possible in any of this activity, though forecast trends
will be closely monitored through the beginning of next week.

LMZ261-362-364-366-563-565-567-868-302130-
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-
854 AM CDT Sat Aug 30 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...West winds 5 to 10 kt becoming southwest. Waves
1 ft or less.
.TONIGHT...Southwest winds 5 to 10 kt becoming west. Waves 1 ft
or less.
.SUNDAY...Southwest winds less than 10 kt increasing to 10 to
15 kt. Waves nearly calm.
.SUNDAY NIGHT...South winds 5 to 10 kt diminishing to less than
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 15 to 25 kt becoming north to 30 kt.
Showers likely with a chance of thunderstorms. Waves 2 to 4 ft
building to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-302130-
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-
854 AM CDT Sat Aug 30 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...East winds 5 to 10 kt backing to northeast.
Waves 1 ft or less.
.TONIGHT...North 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.
.SUNDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 ft or less.
.MONDAY...East winds 5 to 10 kt becoming northeast. 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. Showers likely with a chance of thunderstorms. Waves 3 to
5 ft building to 4 to 6 ft occasionally to 8 ft.

$$

LMZ761-302130-
MAFOR 3016/
MICHIGAN NORTH 11500 11510 13500 11600 11500 11400. Waves 1 foot
or less.

MICHIGAN SOUTH 11200 11100 12800 11100 13200. Waves 1 foot or
less.

$$


MH

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

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