974
FZUS63 KMKX 220803
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
303 AM CDT Sat Aug 22 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...

Steady northwest winds are expected today as a low pressure trough
of 29.8 inches over Lower Michigan continues to exit. Then look
for gusty northerly winds to develop along a cold front that will
track from north to south down Lake Michigan this evening. A few
thunderstorms are possible along this front. Another cold front
will reinforce the northerly winds over Lake Michigan on Sunday
as low pressure around 29.6 inches tracks from Lower Michigan to
Ontario and high pressure of 30.2 inches pushes in from the Upper
Midwest. Variable winds are expected for Monday and Tuesday as
the high crosses the Upper Great Lakes.

LMZ261-362-364-366-563-565-567-868-221530-
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-
303 AM CDT Sat Aug 22 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...North winds 10 to 20 kt becoming northwest 15 to 25 kt.
Slight chance of showers and thunderstorms this afternoon. Waves
2 to 4 ft.
.TONIGHT...North winds to 30 kt diminishing to 15 to 25 kt.
Slight chance of showers and thunderstorms in the evening. Waves
4 to 6 ft occasionally to 8 ft.
.SUNDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY NIGHT...North winds to 30 kt becoming northwest 15 to
25 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.MONDAY...Northwest winds 15 to 25 kt becoming north. Waves 2 to
4 ft.
.MONDAY NIGHT...West winds 10 to 20 kt becoming southwest 5 to
10 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.TUESDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 2 ft building to 2 to 4 ft.
.WEDNESDAY...Southwest winds 15 to 25 kt increasing to 30 kt.
Chance of showers. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-221530-
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-
303 AM CDT Sat Aug 22 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northwest winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.TONIGHT...North winds 15 to 25 kt diminishing to 10 to 20 kt.
Slight chance of showers and thunderstorms in the evening. Waves
4 to 6 ft occasionally to 8 ft.
.SUNDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.MONDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to
4 ft.
.MONDAY NIGHT...East winds 10 to 15 kt veering to south. Waves
1 to 3 ft.
.TUESDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 2 ft building to 1 to 3 ft.
.WEDNESDAY...Southwest winds 15 to 25 kt increasing to 30 kt.
Chance of showers. Waves 3 to 5 ft.

$$

LMZ761-221530-
MAFOR 2210/
MICHIGAN NORTH 11820 12720 11730 11830 11840 12830. Waves 1 to 3
feet building to 2 to 4 feet today. Waves 3 to 6 feet tonight.

MICHIGAN SOUTH 14720 13830 11820. A chance of showers early this
morning. Waves 1 to 3 feet building to 3 to 5 feet today. Waves 2
to 4 feet building to 3 to 5 feet 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