532
FZUS63 KMKX 091949
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
249 PM 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 northeast US tonight. South to southeasterly
winds into tonight but as a low pressure system around 29.8 inches
develops over the northwestern Great Lakes tonight pushing
southeast the pressure gradient will increase as lower pressure
impinges on the high pressure to the east. Breezy southwesterly
winds are expected later tonight through Friday lingering into
Friday night. There will be some gale gusts possible Friday
morning, especially across the northern open waters, but overall
gales are not expected to be widespread or numerous. We will then
see north to northeast winds move in behind the front beginning
Friday afternoon, continuing 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 working its way across Plains and
Upper Midwest.

LMZ261-362-364-366-563-565-567-868-100315-
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-
249 PM CDT Thu Oct 9 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 10 to 20 kt increasing to 30 kt. Waves
3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.
.FRIDAY...Southwest winds to 30 kt becoming west. Scattered
showers. Waves 7 to 10 ft occasionally to 13 ft building to 8 to
11 ft occasionally to 14 ft.
.FRIDAY NIGHT...Northwest winds to 30 kt diminishing to 15 to
25 kt after midnight, then becoming north 10 to 20 kt late.
Chance of showers in the evening. Waves 6 to 9 ft occasionally to
12 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...Northeast winds 10 to 20 kt. Waves 3 to 5 ft.
.SATURDAY NIGHT...East winds 10 to 20 kt becoming southeast 10 to
15 kt. Waves 2 to 4 ft.
.SUNDAY...Southeast winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.SUNDAY NIGHT...Southeast winds 15 to 25 kt. Waves 4 to 6 ft
occasionally to 8 ft building to 5 to 8 ft occasionally to 10 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.
.TUESDAY...North winds 10 to 20 kt becoming northwest. Waves 2 to
4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-100315-
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-
249 PM CDT Thu Oct 9 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$

LMZ761-100315-
MAFOR 0922/
MICHIGAN NORTH 12420 11430 11440 11540 19546 11550 19556 11556
11640 19646. Waves 1 to 3 feet building to 4 to 7 feet tonight.
Waves 5 to 8 feet building to 7 to 11 feet Friday.

MICHIGAN SOUTH 12320 11420 11430 11440 13540. Waves 1 to 3 feet
building to 3 to 6 feet tonight. Waves 5 to 9 feet building to 7
to 10 feet Friday.

$$


Kuroski

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

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