531
FZUS63 KMKX 200848
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
248 AM CST Thu Nov 20 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 of 30.3 inches will remain over the eastern Great
Lakes through today, while low pressure of 29.5 inches progresses
eastward through northern Ontario and deepens to 29.4 inches
in the Hudson Bay overnight tonight. Expect light southwesterly
winds to develop this morning, becoming breezy this afternoon and
evening. Winds shift to become northwesterly and diminish
overnight as a cold front from this low progresses eastward across
the open waters. Light northwest winds continue through Friday,
becoming light and variable Saturday as weak high pressure around
30.0 inches passes over the lake. Winds will become southwesterly
again Saturday night into Sunday, and westerly by Sunday night as
an additional low pressure system deepens across the Hudson Bay
and brings another weak cold front through the Lake.

LMZ261-362-364-366-563-565-567-868-201630-
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-
248 AM CST Thu Nov 20 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Slight chance of drizzle. Waves 3 to 5 ft.
.TONIGHT...Southwest winds 15 to 25 kt becoming west 10 to 20 kt.
Slight chance of drizzle in the evening. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.FRIDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 ft or less building to 1 to 3 ft.
.SATURDAY NIGHT...Southwest winds 15 to 25 kt becoming west.
Waves 3 to 5 ft.
.SUNDAY...West winds 15 to 25 kt. Waves 3 to 5 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming south. Waves 1 to
3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-201630-
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-
248 AM CST Thu Nov 20 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Slight chance of drizzle. Waves 2 to 4 ft.
.TONIGHT...Southwest winds 10 to 20 kt becoming northwest 10 to
15 kt. Slight chance of drizzle. Waves 2 to 4 ft.
.FRIDAY...Northwest winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 2 to 4 ft.
.FRIDAY NIGHT...North winds 10 to 15 kt becoming northeast. Waves
2 to 4 ft.
.SATURDAY...East winds 5 to 10 kt veering to south 10 to 15 kt.
Waves 1 to 3 ft.
.SATURDAY NIGHT...Southwest winds 10 to 20 kt. Waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft.
.SUNDAY...West winds 10 to 20 kt. Waves 4 to 6 ft occasionally to
8 ft.
.MONDAY...South winds 10 to 15 kt becoming southeast. Waves 1 to
3 ft.

$$

LMZ761-201630-
MAFOR 2011/
MICHIGAN NORTH 12520 13530 11630 12620. Waves 1 to 3 feet
building to 3 to 5 feet today. Waves 2 to 4 feet subsiding to 1
to 3 feet tonight.

MICHIGAN SOUTH 12510 14520 11610 11710. Waves 1 to 3 feet.

$$


MH

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

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