262
FZUS63 KMKX 060810
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
310 AM CDT Sat Sep 6 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...

Low pressure around 29.3 inches near James Bay will shift further
to the northeast today. Brisk west northwest winds are expected
today into tonight, becoming more northwest on Sunday. High
pressure around 30.3 inches will move from the northern Plains to
south of Lake Michigan Sunday into Sunday night. This will allow
winds to weaken Sunday night. The high pressure system will move
east of the region Monday, with south winds increasing over the
lake Monday into Tuesday.

Some showers may occur at times over the northern and eastern
portions of Lake Michigan today into Sunday morning, with a few
embedded thunderstorms later today into tonight. A few waterspouts
may occur in this area.

LMZ261-362-364-366-563-565-567-868-061530-
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-
310 AM CDT Sat Sep 6 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Slight chance of waterspouts this morning, then chance of
waterspouts this afternoon. Slight chance of showers this
morning, then chance of showers this afternoon. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.TONIGHT...Northwest winds 10 to 20 kt. Chance of waterspouts.
Chance of showers and slight chance of thunderstorms in the
evening, then chance of showers overnight. Waves 2 to 4 ft.
.SUNDAY...Northwest winds 10 to 20 kt. Chance of waterspouts in
the morning. Waves 2 to 4 ft.
.SUNDAY NIGHT...West winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt. Waves 1 to 2 ft building
to 3 to 5 ft.
.MONDAY NIGHT...South winds 15 to 25 kt. Chance of showers. Waves
4 to 7 ft occasionally to 9 ft.
.TUESDAY...South winds to 30 kt. Chance of showers. Waves 4 to
7 ft occasionally to 9 ft.
.WEDNESDAY...West winds 10 to 15 kt veering to north 10 to 20 kt.
Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-061530-
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-
310 AM CDT Sat Sep 6 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of showers this afternoon. Waves 4 to 6 ft occasionally to
8 ft subsiding to 3 to 5 ft.
.TONIGHT...West winds 10 to 20 kt becoming northwest. Slight
chance of showers and thunderstorms in the evening, then chance
of showers overnight. Waves 3 to 5 ft.
.SUNDAY...Northwest winds 10 to 20 kt diminishing to 10 to 15 kt.
Waves 3 to 5 ft.
.SUNDAY NIGHT...Northwest winds 5 to 10 kt becoming west. Waves
2 to 4 ft subsiding to 1 to 2 ft.
.MONDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 2 ft building to 3 to 5 ft.
.MONDAY NIGHT...South winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.TUESDAY...South winds 15 to 25 kt. Waves 4 to 7 ft occasionally
to 9 ft.
.WEDNESDAY...Southwest winds 10 to 15 kt becoming south. Waves
1 to 3 ft.

$$

LMZ761-061530-
MAFOR 0610/
MICHIGAN NORTH 11630 19636 13620 11610 13720. A chance of
waterspouts this afternoon and tonight. Waves 3 to 6 feet
subsiding to 1 to 3 feet today. Waves 1 to 3 feet tonight.

MICHIGAN SOUTH 11630 19636 12620 11630 11620 13720. Waves 3 to 5
feet subsiding to 2 to 4 feet today. Waves 2 to 4 feet tonight.

$$
Wood

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

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