544
FZUS63 KMKX 090750
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
250 AM CDT Thu Oct 9 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...

High pressure around 30.5 inches will continue to migrate eastward
across the eastern Great Lakes today. Light and variable easterly
winds over Lake Michigan this morning will gradually turn/veer
more south to southeasterly through the afternoon. Breezy
southwesterly winds are expected tonight as low pressure around
29.8 inches works its way down from Ontario and across Lake
Superior into Friday. Strong south-southwesterly winds will
persist through the day Friday with gusts approaching 30 knots as
the low pressure and associated cold front work its way down Lake
Michigan through Friday night. Will then see north to northeast
winds return Saturday through Sunday as the low pressure moves
into southern Michigan. Winds then begin to veer back to the south
for the start of next week with another low pressure system
developing and work its way across Plains and Upper Midwest.

LMZ261-362-364-366-563-565-567-868-091530-
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-
250 AM CDT Thu Oct 9 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southeast winds 5 to 10 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 15 to
25 kt. Slight chance of showers overnight. Waves 4 to 6 ft
occasionally to 8 ft.
.FRIDAY...Southwest winds to 30 kt. Showers likely in the
morning, then showers in the afternoon. Waves 5 to 8 ft
occasionally to 10 ft building to 8 to 11 ft occasionally to
14 ft.
.FRIDAY NIGHT...West winds to 30 kt becoming north 15 to 25 kt.
Showers likely in the evening, then chance of showers overnight.
Waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft
occasionally to 9 ft.
.SATURDAY...Northeast winds 10 to 20 kt. Waves 3 to 5 ft.
.SATURDAY NIGHT...East winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...East winds 10 to 20 kt becoming southeast 15 to 25 kt.
Waves 2 to 4 ft.
.MONDAY...South winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of showers. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-091530-
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-
250 AM CDT Thu Oct 9 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.TONIGHT...Southeast winds 10 to 20 kt becoming south. Waves 3 to
5 ft.
.FRIDAY...Southwest winds to 30 kt. Chance of showers. Waves 5 to
8 ft occasionally to 10 ft building to 8 to 11 ft occasionally to
14 ft.
.FRIDAY NIGHT...West winds to 30 kt becoming northwest 15 to
25 kt. Chance of showers. Waves 7 to 10 ft occasionally to 13 ft
subsiding to 5 to 8 ft occasionally to 10 ft.
.SATURDAY...North winds 10 to 20 kt. Waves 4 to 6 ft occasionally
to 8 ft.
.SATURDAY NIGHT...Northeast winds 10 to 15 kt becoming east.
Waves 2 to 4 ft.
.SUNDAY...East winds 10 to 15 kt becoming southeast 10 to 20 kt.
Waves 2 to 4 ft.
.MONDAY...Southeast winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft
occasionally to 9 ft.

$$

LMZ761-091530-
MAFOR 0910/
MICHIGAN NORTH 11300 11400 12410 12420 12430. Waves 1 to 3 feet
today. Waves 1 to 3 feet building to 3 to 5 feet tonight.

MICHIGAN SOUTH 11300 14310 11320 12420. Waves 1 to 3 feet today.
Waves 1 to 3 feet building to 2 to 4 feet tonight.

$$


Wagner

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

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