036
FZUS63 KMKX 272001
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
301 PM CDT Wed Aug 27 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...

A trough of low pressure and associated cold front will drop
southward through the area tonight into early Thursday. Modest
southwesterly winds will continue ahead of the cold front, veering
due north to northeast behind it. The passing front will likely
produce scattered showers and isolated thunderstorms, with some
potential for waterspouts tonight over the northern half of the
lake, then over the southern half of the lake Thursday (along and
behind the frontal boundary). North winds behind the front become
breezy (up to 25 kt at times) Thursday afternoon and evening, then
gradually subside into Friday as high pressure builds into the
region from the north. An extended period of light and variable
winds with quiet weather will then occur this weekend through
early next week as high pressure lingers over the upper Great
Lakes.

LMZ261-362-364-366-563-565-567-868-280330-
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-
301 PM CDT Wed Aug 27 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds 15 to 25 kt veering to northwest 10 to
20 kt. Showers likely with a chance of thunderstorms this
evening, then chance of showers and thunderstorms overnight.
Waves 3 to 5 ft.
.THURSDAY...North winds 10 to 20 kt increasing to 30 kt. Slight
chance of showers and thunderstorms in the morning. Waves 2 to
4 ft building to 4 to 7 ft occasionally to 9 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northeast
10 to 15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to
2 to 4 ft.
.FRIDAY...Northeast winds 10 to 15 kt becoming north. Waves 1 to
3 ft subsiding to 1 to 2 ft.
.FRIDAY NIGHT...North winds 10 to 15 kt becoming northwest. Waves
1 to 2 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest. Waves 1 ft
or less.
.SATURDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 ft or less.
.SUNDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves nearly calm.
.MONDAY...South winds 5 to 10 kt becoming southwest. Waves nearly
calm.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-280330-
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-
301 PM CDT Wed Aug 27 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southwest winds 10 to 20 kt becoming west. Chance of
showers and thunderstorms overnight. Waves 1 to 3 ft building to
4 to 6 ft occasionally to 8 ft.
.THURSDAY...West winds 10 to 20 kt becoming northwest late in the
morning, then becoming north to 30 kt in the afternoon. Chance of
waterspouts. Chance of showers and thunderstorms in the morning,
then slight chance of showers and thunderstorms in the afternoon.
Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft
occasionally to 10 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northeast
10 to 15 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 6 ft occasionally to 8 ft.
.FRIDAY...Northeast winds 10 to 15 kt. Waves 3 to 5 ft subsiding
to 1 to 3 ft.
.FRIDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.SATURDAY...East winds 5 to 10 kt becoming northeast. Waves 1 to
2 ft.
.SATURDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 ft or less.
.SUNDAY...East winds 5 to 10 kt becoming northeast. Waves 1 ft or
less.
.MONDAY...Southeast winds 5 to 10 kt becoming east. Waves 1 ft or
less.

$$

LMZ761-280330-
MAFOR 2722/
MICHIGAN NORTH 11530 12636 11726 12820 12830. A chance of
thunderstorms tonight. Waves 2 to 4 feet tonight. Waves 2 to 4
feet building to 3 to 6 feet Thursday.

MICHIGAN SOUTH 12520 13620 11720 11730 11840. A chance of
waterspouts Thursday. A chance of showers and thunderstorms
overnight and Thursday morning. Waves 1 to 3 feet building to 3
to 5 feet tonight. Waves 3 to 6 feet building to 4 to 7 feet
Thursday.

$$


Sheppard

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

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