296
FZUS63 KMKX 300731
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
231 AM CDT Tue Sep 30 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...

Light and variable winds early this morning will become light
northeast winds later this morning. A high pressure area of 30.4
inches will move from northern Ontario to Quebec today into
Wednesday. This will allow east-northeast winds to become
established over Lake Michigan becoming east-southeast winds on
Wednesday. The high will advance into the northeastern United
States through the end of the week, allowing winds to turn out of
the south Thursday through Friday. Broad low pressure will form
over the northern Great Plains Saturday, and will gradually
attempt to work toward the upper Mississippi River Valley by the
end of next weekend. Chances for isolated showers and
thunderstorms return to the forecast Saturday evening through
Monday.


LMZ261-362-364-366-563-565-567-868-301515-
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-
231 AM CDT Tue Sep 30 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt.
Waves 2 to 4 ft.
.TONIGHT...Northeast winds 15 to 25 kt becoming east 10 to 20 kt.
Waves 3 to 5 ft.
.WEDNESDAY...Southeast winds 10 to 20 kt becoming east. Waves
2 to 4 ft.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 kt. Waves 2 to 4 ft
building to 4 to 6 ft occasionally to 8 ft.
.THURSDAY...South winds 10 to 20 kt. Waves 4 to 6 ft occasionally
to 8 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-301515-
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-
231 AM CDT Tue Sep 30 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northeast winds 5 to 10 kt becoming north 10 to 15 kt
late. Waves 1 to 2 ft.
.TONIGHT...Northeast winds 10 to 20 kt becoming east. Waves 1 to
2 ft building to 3 to 5 ft.
.WEDNESDAY...East winds 10 to 20 kt diminishing to 10 to 15 kt.
Waves 3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY NIGHT...East winds 10 to 20 kt becoming southeast.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.THURSDAY NIGHT...Southeast winds 10 to 15 kt becoming south.
Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 3 to 5 ft.

$$

LMZ761-301515-
MAFOR 3010/
MICHIGAN NORTH 11220 11230 13130 12230 11220. Waves 1 to 3 feet
building to 2 to 4 feet today. Waves 2 to 4 feet tonight.

MICHIGAN SOUTH 13100 12810 11130 12230. Waves 1 foot or less
today. Waves 1 to 3 feet building to 3 to 5 feet tonight.

$$


Gehring

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

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