688
FZUS63 KMKX 021403
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
903 AM CDT Thu Oct 2 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...

No major changes to the going forecast with this issuance.

Modest southeast winds will gradually weaken through the day then
shift southerly tonight through Friday night as high pressure
around 30.4 inches over New England shifts south into the Mid
Atlantic States. 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 the weekend. This
will bring breezy southerly winds to Lake Michigan for the weekend
with gales possible over the north half for Sunday afternoon and
night.

LMZ261-362-364-366-563-565-567-868-022130-
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-
903 AM CDT Thu Oct 2 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds 10 to 20 kt. Waves 3 to 5 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest. Waves 2 to
4 ft.
.FRIDAY...Southwest winds 10 to 15 kt becoming south. Waves 1 to
2 ft.
.FRIDAY NIGHT...South winds 10 to 15 kt. Waves 1 to 3 ft.
.SATURDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...South winds to 30 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.SUNDAY...South winds to 30 kt increasing to gales to 35 kt.
Waves 4 to 7 ft occasionally to 9 ft building to 7 to 10 ft
occasionally to 13 ft.
.MONDAY...Northwest winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-022130-
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-
903 AM CDT Thu Oct 2 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Southeast winds 10 to 20 kt. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.TONIGHT...Southeast winds 10 to 15 kt becoming south. Waves 1 to
3 ft.
.FRIDAY...Southwest winds 10 to 15 kt becoming south. Waves 1 to
3 ft.
.FRIDAY NIGHT...South winds 10 to 15 kt. Waves 2 to 4 ft.
.SATURDAY...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...South winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.SUNDAY...South winds 15 to 25 kt increasing to gales to 35 kt.
Waves 4 to 7 ft occasionally to 9 ft building to 7 to 10 ft
occasionally to 13 ft.
.MONDAY...West winds 15 to 25 kt veering to north 10 to 20 kt.
Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft
occasionally to 8 ft.

$$

LMZ761-022130-
MAFOR 0216/
MICHIGAN NORTH 14420 11420 11410 12510. Waves 2 to 4 feet
subsiding to 1 to 3 feet this afternoon. Waves 1 to 3 feet
tonight. Waves 2 feet or less Friday morning.

MICHIGAN SOUTH 14310 13410 11510. Waves 2 to 4 feet subsiding to
1 to 3 feet this afternoon. Waves 1 to 3 feet tonight. Waves 2
feet or less Friday morning.

$$


CMiller

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

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