874
FZUS63 KMKX 240806
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
306 AM CDT Mon Aug 24 2026

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...

Low pressure around 29.6 inches in eastern Ontario will linger
through this evening, resulting in breezy northwest winds across
the northern third of Lake Michigan. High pressure around 30.1
inches drift across Wisconsin and Lake Michigan through Tuesday
afternoon and winds will diminish and become light and variable.
Look for south to southwest winds to develop over the lake Tuesday
afternoon as the high shifts into Ontario and 29.7 inch low
pressure approaches from the northern Great Plains Tuesday night
into Wednesday.

The low will cross Lake Michigan Wednesday afternoon, bringing a
breezy northwest wind shift, but gales are not expected as this
occurs. Showers and thunderstorms will accompany the
approaching/passing surface low Tuesday night into Wednesday
afternoon, but they are not expected to be severe. The next area
of 30.1 inch high pressure will gradually build toward Lake
Michigan from the northern Great Plains Wednesday night through
Friday.

LMZ261-362-364-366-563-565-567-868-241530-
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-
306 AM CDT Mon Aug 24 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northwest winds to 30 kt becoming north 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.TONIGHT...North winds 10 to 20 kt diminishing to 5 to 10 kt.
Waves 1 to 3 ft subsiding to 1 to 2 ft.
.TUESDAY...South winds 5 to 10 kt increasing to 15 to 25 kt.
Waves 1 to 3 ft building to 3 to 5 ft.
.TUESDAY NIGHT...South winds 15 to 25 kt. Chance of showers
overnight. Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...South winds to 30 kt becoming southwest. Chance of
showers. Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY NIGHT...West winds 15 to 25 kt becoming northwest
10 to 20 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.THURSDAY...Northwest winds 15 to 25 kt increasing to 30 kt.
Waves 1 to 3 ft.
.FRIDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-241530-
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-
306 AM CDT Mon Aug 24 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northwest winds 10 to 20 kt becoming north. Waves 3 to
5 ft.
.TONIGHT...North winds 10 to 20 kt diminishing to 5 to 10 kt late
in the evening, then becoming west after midnight becoming west
5 to 10 kt late. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.TUESDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt
late in the morning, then becoming south 10 to 20 kt in the
afternoon. Waves 1 to 3 ft building to 3 to 5 ft.
.TUESDAY NIGHT...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...Southwest winds to 30 kt. Chance of showers in the
afternoon. Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 kt becoming west
10 to 20 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.THURSDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY...North winds 10 to 15 kt. Waves 1 to 2 ft.

$$

LMZ761-241530-
MAFOR 2410/
MICHIGAN NORTH 11740 12730 12830 11810 12800. Waves 3 to 5 feet
subsiding to 1 to 3 feet today. Waves 2 feet or less tonight.

MICHIGAN SOUTH 13720 12820 11810 12600. Waves 2 to 4 feet today.
Waves 1 to 3 feet subsiding to 1 foot or less tonight.

$$


Cronce

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

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