663
FZUS63 KMKX 052109
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
309 PM CST Fri Dec 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...

A low pressure trough of 29.7 inches will cross Lake Michigan this
evening and winds will veer to the west and become breezy Saturday
morning as high pressure of 30.0 inches builds in from the west.
Breezy northerly winds are then expected Sunday as low pressure
around 30.0 inches crosses IL and the strengthening high pressure
of 30.5 inches reaches Minnesota. Gusts are expected to remain
below gales.

Monday night will feature gusty southwest winds with a few gale
force gusts possible as low pressure of 29.8 inches crosses Lake
Superior. A low around 29.2 inches crossing central WI Tuesday
night will bring another round of gusty winds and this system may
also bring a few gale force gusts.

LMZ261-362-364-366-563-565-567-868-060415-
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-
309 PM CST Fri Dec 5 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds to 30 kt becoming northwest 15 to
25 kt. Snow and slight chance of light freezing drizzle this
evening, then chance of snow overnight. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.
.SATURDAY...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.SATURDAY NIGHT...Northwest winds 10 to 15 kt becoming north.
Chance of snow overnight. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.SUNDAY...North winds 15 to 25 kt. Chance of snow in the morning.
Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
15 kt overnight. Waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft.
.MONDAY...South winds 10 to 20 kt becoming southwest to 30 kt in
the afternoon. Chance of snow in the afternoon. Waves 1 to 3 ft
building to 3 to 5 ft.
.MONDAY NIGHT...Southwest winds to 30 kt. Snow. Waves 6 to 9 ft
occasionally to 12 ft building to 8 to 11 ft occasionally to
14 ft.
.TUESDAY...West winds to 30 kt diminishing to 15 to 25 kt. Chance
of snow. Waves 8 to 11 ft occasionally to 14 ft subsiding to 5 to
8 ft occasionally to 10 ft.
.WEDNESDAY...Northwest winds to 30 kt becoming north. Snow
likely. Waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to
10 ft occasionally to 13 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-060415-
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-
309 PM CST Fri Dec 5 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southwest winds to 30 kt becoming west 15 to 25 kt.
Chance of snow. Waves 6 to 9 ft occasionally to 12 ft.
.SATURDAY...Northwest winds 15 to 25 kt diminishing to 10 to
15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.SATURDAY NIGHT...Northwest winds 5 to 10 kt veering to east
10 to 15 kt. Snow likely overnight. Waves 2 to 4 ft subsiding to
1 to 2 ft.
.SUNDAY...North winds 15 to 25 kt. Chance of snow in the morning.
Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft
occasionally to 10 ft.
.SUNDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to
20 kt. Chance of snow showers in the evening. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.
.MONDAY...Southeast winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...Southwest winds to 30 kt. Chance of snow. Waves
6 to 9 ft occasionally to 12 ft building to 8 to 12 ft
occasionally to 16 ft.
.TUESDAY...Southwest winds to 30 kt. Waves 8 to 12 ft
occasionally to 16 ft subsiding to 7 to 10 ft occasionally to
13 ft.
.WEDNESDAY...West gales to 35 kt becoming northwest. Rain and
snow likely. Waves 10 to 14 ft occasionally to 18 ft.

$$

LMZ761-060415-
MAFOR 0523/
MICHIGAN NORTH 12537 12630 13730 11720. Waves 4 to 7 feet
subsiding to 3 to 6 feet tonight. Waves 3 to 6 feet subsiding to
1 to 3 feet Saturday.

MICHIGAN SOUTH 11540 11547 11640 11630 11730 12720 11710. Waves 5
to 9 feet tonight. Waves 4 to 7 feet subsiding to 3 to 6 feet
Saturday.

$$


Cronce

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

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