909
FZUS63 KMKX 060152
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
852 PM CDT Fri Sep 5 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...

Low pressure around 29.2 inches will persist near James Bay
tonight and then exit to the northeast on Saturday. Brisk
westerly winds will linger tonight over Lake Michigan, then
gradually weaken Saturday into Saturday night as they shift to the
northwest. High pressure around 30.3 will push across the Upper
Great Lakes Sunday into Monday.

Some showers may occur at times over the northern portions of
Lake Michigan through Saturday night, with a few embedded
thunderstorms. A few waterspouts may occur in this area during
this period.

LMZ261-362-364-366-563-565-567-868-060915-
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-
852 PM CDT Fri Sep 5 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...West winds to 30 kt diminishing to 15 to
25 kt. Slight chance of waterspouts. Slight chance of showers.
Waves 7 to 10 ft occasionally to 13 ft subsiding to 5 to 8 ft
occasionally to 10 ft.
.SATURDAY...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Slight chance of waterspouts in the morning, then chance of
waterspouts in the afternoon. Slight chance of showers. Waves
4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.SATURDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Chance of showers in the evening. Waves 2 to 4 ft.
.SUNDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.SUNDAY NIGHT...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 1 to 3 ft.
.MONDAY...West winds 10 to 20 kt becoming southwest. Waves 1 to
2 ft building to 2 to 4 ft.
.MONDAY NIGHT...South winds 15 to 25 kt. Waves 3 to 5 ft building
to 4 to 6 ft occasionally to 8 ft.
.TUESDAY...South winds 15 to 25 kt. Chance of showers. Waves 4 to
7 ft occasionally to 9 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt becoming north. Waves
1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-060915-
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-
852 PM CDT Fri Sep 5 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...West winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to
6 ft occasionally to 8 ft.
.SATURDAY...West winds 10 to 20 kt. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 3 to 5 ft.
.SATURDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Waves 3 to 5 ft.
.SUNDAY...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.SUNDAY NIGHT...Northwest winds 10 to 15 kt becoming west 5 to
10 kt. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.MONDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 2 ft building to 2 to 4 ft.
.MONDAY NIGHT...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 3 to 5 ft building to 4 to 6 ft occasionally to
8 ft.
.TUESDAY...South winds 15 to 25 kt. Waves 4 to 7 ft occasionally
to 9 ft.
.WEDNESDAY...Southwest winds 10 to 15 kt veering to north 10 to
20 kt. Waves 1 to 3 ft.

$$

LMZ761-060915-
MAFOR 0604/
MICHIGAN NORTH 11640 13630 14620. A chance of waterspouts
Saturday afternoon. A chance of showers Saturday evening. Waves 6
to 9 feet subsiding to 4 to 7 feet overnight. Waves 3 to 5 feet
subsiding to 1 to 3 feet Saturday. Waves 1 to 3 feet Saturday
evening.

MICHIGAN SOUTH 11630 15620 11620. Waves 4 to 7 feet subsiding to
3 to 6 feet overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet
Saturday. Waves 2 to 4 feet Saturday evening.

$$


Gehring

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

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