589
FZUS63 KMKX 152002
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
302 PM CDT Tue Sep 15 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...

Scattered showers and weak thunderstorms remain possible over
southern portions of the lake later today through Wednesday as a
frontal boundary remains stalled south of the lake. A separate
cold front is set to cross the lake later this afternoon,
allowing the ongoing breezy southwest winds to veer northwest
and decelerate.

High pressure around 30.4 inches will track east across southern
Ontario Canada late tonight through Wednesday, veering winds due
north then northeast. Predominantly light and variable winds
expected late Wednesday night through Thursday as additional
high pressure forms over Manitoba and weakens the pressure
gradient.

Breezy east to northeast winds may then develop late this week
into this weekend as the aforementioned high pressure shifts
east across Ontario Canada and low pressure spreads east from
the Great Plains. The gradient between these two systems could
drive gusty winds from various directions depending on system
track, though our best guess is predominantly east (northeast to
southeast) for the time being.

LMZ261-362-364-366-563-565-567-868-160315-
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-
302 PM CDT Tue Sep 15 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...West winds to 30 kt becoming northwest 10 to 20 kt
late this evening, then becoming north after midnight becoming
north 10 to 20 kt late. Waves 4 to 7 ft occasionally to 9 ft
subsiding to 2 to 4 ft.
.WEDNESDAY...North winds 10 to 20 kt becoming northeast 5 to
10 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming
southeast. Waves 1 to 2 ft.
.THURSDAY...East winds 10 to 15 kt backing to northwest. Waves
1 to 2 ft.
.THURSDAY NIGHT...North winds 10 to 15 kt becoming northeast.
Waves 1 to 3 ft.
.FRIDAY...East winds 10 to 15 kt. Waves 1 to 3 ft.
.FRIDAY NIGHT...East winds to 30 kt becoming southeast. Showers
likely. Waves 4 to 6 ft occasionally to 8 ft building to 6 to
9 ft occasionally to 12 ft.
.SATURDAY...East winds to 30 kt. Chance of showers. Waves 7 to
10 ft occasionally to 13 ft.
.SUNDAY...Northeast winds 15 to 25 kt. Waves 4 to 6 ft
occasionally to 8 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-160315-
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-
302 PM CDT Tue Sep 15 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...West winds 10 to 20 kt veering to northeast. Chance of
showers and slight chance of thunderstorms. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Slight chance of showers. Waves 3 to 5 ft subsiding to
2 to 4 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt veering to south
10 to 15 kt. Chance of showers overnight. Waves 1 to 3 ft.
.THURSDAY...North winds 10 to 15 kt. Chance of showers in the
morning. Waves 1 to 2 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt becoming northeast.
Waves 2 to 4 ft.
.FRIDAY...East winds 10 to 20 kt. Chance of showers in the
afternoon. Waves 3 to 5 ft.
.FRIDAY NIGHT...East winds to 30 kt becoming southeast. Showers
likely with a chance of thunderstorms. Waves 4 to 7 ft
occasionally to 9 ft building to 7 to 10 ft occasionally to
13 ft.
.SATURDAY...Southeast winds to 30 kt becoming south. Showers with
a chance of thunderstorms. Waves 8 to 11 ft occasionally to
14 ft.
.SUNDAY...Northeast winds 15 to 25 kt. Chance of showers. Waves
4 to 7 ft occasionally to 9 ft.

$$

LMZ761-160315-
MAFOR 1522/
MICHIGAN NORTH 11640 11720 13820 12110 11100. Waves 4 to 7 feet
subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet Wednesday.

MICHIGAN SOUTH 11630 11720 11820 13120 12110. A chance of showers
tonight. Waves 3 to 6 feet subsiding to 1 to 3 feet, then
building to 2 to 4 feet tonight. Waves 3 to 5 feet subsiding to 1
to 3 feet Wednesday.

$$


Sheppard

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

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