932
FZUS63 KMKX 231359
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
859 AM CDT Sat Aug 23 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...

Winds shift to the northwest and become brisk behind the cold
front Saturday through Monday, as low pressure strengthens to
around 29.4 inches over James Bay. There will be a potential for
some waterspouts across the northern half of the lake Sunday into
Monday as well, as temperatures drop and lake effect showers
develop. Northwest winds will weaken on Tuesday.

LMZ261-362-364-366-563-565-567-868-232115-
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 Sat Aug 23 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...West winds 10 to 20 kt. Slight chance of showers
through mid morning, then slight chance of showers and
thunderstorms this afternoon. Waves 3 to 5 ft.
.TONIGHT...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest 15 to 25 kt.
Chance of waterspouts. Chance of showers. Waves 2 to 4 ft.
.SUNDAY NIGHT...Northwest winds 15 to 25 kt. Chance of
waterspouts in the evening. Chance of showers. Waves 3 to 5 ft.
.MONDAY...Northwest winds 15 to 25 kt increasing to 30 kt. Waves
3 to 5 ft.
.MONDAY NIGHT...North winds to 30 kt becoming northwest 10 to
20 kt. Waves 2 to 4 ft.
.TUESDAY...Northwest winds 10 to 20 kt. Waves 1 to 3 ft.
.WEDNESDAY...West winds 10 to 20 kt becoming southwest 15 to
25 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-232115-
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 Sat Aug 23 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...West winds 10 to 20 kt becoming northwest. Waves
3 to 5 ft.
.TONIGHT...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.SUNDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.SUNDAY NIGHT...Northwest winds 15 to 25 kt. Chance of showers in
the evening. Slight chance of waterspouts. Waves 4 to 7 ft
occasionally to 9 ft.
.MONDAY...Northwest winds 15 to 25 kt. Slight chance of
waterspouts. Waves 4 to 7 ft occasionally to 9 ft.
.MONDAY NIGHT...Northwest winds 10 to 20 kt becoming north. Waves
4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.
.TUESDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.
.WEDNESDAY...West winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.

$$

LMZ761-232115-
MAFOR 2316/
MICHIGAN NORTH 11630 11620 14720 12620. A chance of waterspouts
Sunday morning. A chance of showers and slight chance of
thunderstorms today and Sunday morning. Waves 2 to 4 feet.

MICHIGAN SOUTH 11620 15720 11720. Waves 2 to 4 feet building to 3
to 5 feet this afternoon. Waves 3 to 5 feet subsiding to 2 to 4
feet tonight. Waves 3 to 5 feet Sunday morning.

$$


Sheppard

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

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