685
FZUS63 KMKX 121248
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
748 AM CDT Sat Sep 12 2026

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...

Southerly winds will continue to increase this morning as a cold
front approaches the region, with winds shifting to westerly as
the cold front moves across the lake this afternoon. Expecting
wind gusts to remain primarily in the 25 to 30 knot range over the
open waters, though a few gusts approaching gale force may occur
in far northern portions of the lake. Isolated showers and
thunderstorms are possible ahead of the approaching cold front.

High pressure around 30.2 inches will build in from the
northern Great Plains Sunday night into Monday. Expect decreasing
winds Saturday night through Sunday, and winds gradually shifting
to the southeast and increasing Sunday night into Monday. Winds
will increase and veer south-southwest Monday night into Tuesday
as low pressure around 29.4 inches develops over Manitoba. Gales
appear likely during this time frame. Periods of showers and
thunderstorms will accompany the developing low from as early as
Monday evening into Tuesday. Winds will trend northerly and weaken
behind a cold front Tuesday night into Wednesday.

LMZ261-362-364-366-563-565-567-868-122115-
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-
748 AM CDT Sat Sep 12 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds to 30 kt becoming west. Slight
chance of showers this morning, then chance of showers this
afternoon. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.TONIGHT...Northwest winds 10 to 20 kt becoming north 15 to
25 kt, then becoming northwest 10 to 20 kt late. Waves 3 to 5 ft.
.SUNDAY...Northwest winds 10 to 20 kt increasing to 30 kt. Waves
3 to 5 ft.
.SUNDAY NIGHT...Northwest winds to 30 kt becoming north 10 to
15 kt overnight. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.MONDAY...Northeast winds 10 to 15 kt veering to south to 30 kt
in the afternoon. Waves 1 to 2 ft building to 4 to 6 ft
occasionally to 8 ft.
.MONDAY NIGHT...South gales to 35 kt. Showers. Waves 8 to 11 ft
occasionally to 14 ft building to 12 to 16 ft occasionally to 21
ft.
.TUESDAY...Southwest gales to 35 kt becoming west gales to 35 kt.
Chance of showers. Waves 12 to 16 ft occasionally to 21 ft
subsiding to 7 to 10 ft occasionally to 13 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt. Chance of showers.
Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-122115-
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-
748 AM CDT Sat Sep 12 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.TONIGHT...Northwest winds 10 to 20 kt becoming north. Waves 4 to
6 ft occasionally to 8 ft.
.SUNDAY...North winds 10 to 20 kt becoming northwest 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.SUNDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to
15 kt overnight. Waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft.
.MONDAY...East winds 10 to 20 kt becoming southeast to 30 kt in
the afternoon. Waves 2 to 4 ft building to 4 to 6 ft occasionally
to 8 ft.
.MONDAY NIGHT...Southeast gales to 35 kt becoming south. Chance
of showers and thunderstorms. Waves 8 to 11 ft occasionally to 14
ft building to 12 to 16 ft occasionally to 21 ft.
.TUESDAY...Southwest gales to 35 kt becoming west to 30 kt.
Showers likely. Waves 12 to 16 ft occasionally to 21 ft subsiding
to 7 to 10 ft occasionally to 13 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt. Showers likely with a
chance of thunderstorms. Waves 1 to 3 ft.

$$

LMZ761-122115-
MAFOR 1216/
MICHIGAN NORTH 11540 11640 11720 11730 11830 13720. A chance of
showers this afternoon. Waves 3 to 6 feet this afternoon. Waves 2
to 4 feet tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet
Sunday morning.

MICHIGAN SOUTH 11540 11530 11620 12730 11830 12820. Waves 3 to 5
feet this afternoon. Waves 1 to 3 feet building to 3 to 5 feet
tonight. Waves 3 to 5 feet Sunday morning.

$$


Quigley

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

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