618
FZUS63 KMKX 111322
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
822 AM CDT Mon Aug 11 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 synopsis at this time. Light to
modest southerly to southwesterly winds will continue early this
week. The chance for showers and thunderstorms continues through
Tuesday, with the best chances tonight into Tuesday morning. Low
pressure of 29.8 inches and an associated cold front then sweep
across the Upper Great Lakes Tuesday night bringing northwesterly
winds and drier weather for the middle of the week. Patchy dense
fog may occur at times due to the abundant moist conditions.

LMZ261-362-364-366-563-565-567-868-112115-
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-
822 AM CDT Mon Aug 11 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southwest winds 10 to 20 kt. Chance of showers
and slight chance of thunderstorms through mid morning. Waves
2 to 4 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Chance of showers overnight. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 15 kt increasing to 15 to 25 kt.
Chance of showers in the morning, then chance of showers and
thunderstorms in the afternoon. Waves 1 to 3 ft.
.TUESDAY NIGHT...West winds 10 to 20 kt becoming northwest 10 to
15 kt. Chance of showers and thunderstorms in the evening, then
chance of showers overnight. Waves 1 to 3 ft.
.WEDNESDAY...Northwest winds 10 to 20 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt diminishing to
5 to 10 kt. Waves 1 to 2 ft.
.THURSDAY...East winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-112115-
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-
822 AM CDT Mon Aug 11 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Southwest winds 10 to 20 kt becoming south 10 to
15 kt. Slight chance of showers and thunderstorms. Waves 2 to
4 ft.
.TONIGHT...South winds 10 to 15 kt becoming southwest. Chance of
showers and thunderstorms. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Chance of showers and thunderstorms. Waves 1 to 3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 20 kt becoming northwest
10 to 15 kt. Chance of showers. Waves 1 to 3 ft.
.WEDNESDAY...North winds 10 to 15 kt. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 kt. Waves 1 to 2 ft.
.THURSDAY...East winds 5 to 10 kt. Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ761-112115-
MAFOR 1116/
MICHIGAN NORTH 12520 12420 13510 11520. A chance of showers late
this morning, overnight, and Tuesday morning. Waves 1 to 3 feet
this afternoon. Waves 2 feet or less tonight and Tuesday morning.

MICHIGAN SOUTH 11520 14410 13510. A chance of showers late this
morning. A chance of showers and thunderstorms tonight and
Tuesday morning. Waves 1 to 3 feet this afternoon. Waves 2 feet
or less tonight and Tuesday morning.

$$


Quigley

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

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