689
FZUS63 KMKX 110211
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
911 PM CDT Thu Sep 10 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...

High pressure around 30.0 inches along with light and variable
winds will linger over the Great Lakes into Friday morning. Then
expect the high pressure to shift into the eastern Great Lakes
with south to southwesterly winds picking up over Lake Michigan
through the day as low pressure around 29.2 inches works its way
into the Hudson Bay. The strongest gusts are expected to occur
across the northern third of Lake Michigan Friday afternoon into
Saturday and may briefly approach gale force at times. The low
pressure will gradually slide eastward through the weekend and
drag a weak cold front across the Upper Great Lakes region on
Saturday shifting winds to the west-northwest by Saturday night.
Will then see winds gradually lessen through the day Sunday as
high pressure around 30.2 inches builds across the northern
Plains and into the Upper Great Lakes through Sunday evening.
Another low pressure then develops across the Canadian Plains and
tracks across Ontario for the start of the week. This will bring
a return of increasing south-southwesterly wind over Lake Michigan
ahead of this systems cold front, but timing and gusts will depend
on the strength of the low pressure and cold front.

LMZ261-362-364-366-563-565-567-868-110930-
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-
911 PM CDT Thu Sep 10 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds 5 to 10 kt becoming southwest
10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.FRIDAY NIGHT...South winds to 30 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.SATURDAY...Southwest winds to 30 kt. Chance of showers. Waves
4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt becoming northeast. Waves
2 to 4 ft.
.MONDAY...East winds to 30 kt becoming southeast. Chance of
showers. Waves 4 to 6 ft occasionally to 8 ft building to 6 to
9 ft occasionally to 12 ft.
.TUESDAY...Southwest gales to 40 kt becoming west gales to 35 kt.
Chance of showers. Waves 10 to 14 ft occasionally to 18 ft
subsiding to 6 to 9 ft occasionally to 12 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-110930-
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-
911 PM CDT Thu Sep 10 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Northeast winds 10 to 15 kt becoming
southeast. Waves 1 to 2 ft.
.FRIDAY...Southeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft.
.FRIDAY NIGHT...Southeast winds 10 to 20 kt becoming south. Waves
2 to 4 ft.
.SATURDAY...South winds 15 to 25 kt becoming southwest. Waves
4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Waves 2 to 4 ft.
.SUNDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt becoming northeast. Waves
2 to 4 ft building to 3 to 5 ft.
.MONDAY...East winds to 30 kt becoming southeast gales to 35 kt.
Chance of showers. Waves 4 to 7 ft occasionally to 9 ft building
to 6 to 9 ft occasionally to 12 ft.
.TUESDAY...Southwest gales to 35 kt becoming west to 30 kt.
Chance of showers. Waves 10 to 14 ft occasionally to 18 ft
subsiding to 6 to 9 ft occasionally to 12 ft.

$$

LMZ761-110930-
MAFOR 1104/
MICHIGAN NORTH 11410 11420 12520 12430 11440 11430. Waves 2 feet
or less overnight. Waves 1 to 3 feet building to 3 to 6 feet
Friday. Waves 3 to 6 feet Friday evening.

MICHIGAN SOUTH 11200 13310 14320. Waves 1 foot or less overnight.
Waves 1 to 3 feet Friday. Waves 2 to 4 feet subsiding to 1 to 3
feet Friday evening.

$$


Wagner

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

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