182
FZUS63 KMKX 121336
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
836 AM CDT Sun Jul 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...

High pressure of 30.2 inches over the Great Lakes region will
maintain an axis roughly from northern Iowa to southern Lower
Michigan through Monday and then sink into Illinois and Indiana
Tuesday and Wednesday while weakening to 30.1 inches. Low pressure
around 29.6 inches will approach from the Northern Plains Thursday
into Friday. Look for winds over Lake Michigan to become
southerly across the north half today and light and variable in
the south. Winds will become south-southwesterly Monday and
increase a bit by Tuesday. A weak cold front will bring a wind
shift to the north-northeast Wednesday into Thursday.

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-
836 AM CDT Sun Jul 12 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southwest winds 10 to 20 kt increasing to 15 to
25 kt. Waves 2 to 4 ft.
.TONIGHT...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 2 to 4 ft.
.MONDAY...Southwest winds 10 to 20 kt. Waves 1 to 3 ft.
.MONDAY NIGHT...Southwest winds 10 to 20 kt. Waves 1 to 3 ft.
.TUESDAY...West winds 15 to 25 kt becoming southwest to 30 kt.
Waves 2 to 4 ft.
.TUESDAY NIGHT...West winds 15 to 25 kt becoming northwest 10 to
15 kt. Waves 2 to 4 ft.
.WEDNESDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.THURSDAY...North winds 10 to 15 kt becoming northwest 10 to
20 kt. Waves 1 to 2 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-
836 AM CDT Sun Jul 12 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...East winds 5 to 10 kt backing to northwest.
Waves 1 to 2 ft.
.TONIGHT...Northwest winds 10 to 15 kt becoming southwest. Waves
1 to 2 ft.
.MONDAY...West winds 10 to 15 kt becoming south. Waves 1 to 2 ft.
.MONDAY NIGHT...Southwest winds 10 to 15 kt. Waves 1 to 2 ft.
.TUESDAY...West winds 10 to 15 kt becoming southwest 10 to 20 kt.
Waves 1 to 2 ft.
.TUESDAY NIGHT...Southwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 1 to 3 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt becoming north 10 to
20 kt. Waves 1 to 3 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming north 10 to
20 kt. Waves 1 to 2 ft.

$$

LMZ761-122115-
MAFOR 1216/
MICHIGAN NORTH 12520 13530 13520. Waves 1 to 3 feet this
afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight.
Waves 1 to 3 feet Monday morning.

MICHIGAN SOUTH 11100 13710 11410 11510 11610 11510. Waves 1 foot
or less.

$$


DDV

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

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