103
FZUS63 KMKX 261402
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
902 AM CDT Wed Aug 26 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...

No major changes to the going forecast with this issuance.

Breezy south winds will continue through the morning as the
pressure gradient sharpens ahead of a slow-moving cold front and
low pressure of 29.7 inches just north of Lake Superior. Winds
will become more southwesterly later this morning, then westerly
with the frontal passage in the afternoon. Look for lighter
northwesterly winds behind the front tonight.

The northwest winds will grow breezier for a bit on Thursday
ahead of another cold front dropping south over the lake, but
winds will then become lighter and northeasterly Thursday night
into Friday as high pressure of 30.2 inches moves into the upper
Great Lakes region.

LMZ261-362-364-366-563-565-567-868-262115-
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-
902 AM CDT Wed Aug 26 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of showers and thunderstorms. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.TONIGHT...Northwest winds 10 to 20 kt. Slight chance of showers
and thunderstorms in the evening. Waves 2 to 4 ft subsiding to
1 to 3 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming north 15 to
25 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
15 kt overnight. Waves 1 to 3 ft.
.FRIDAY...North winds 10 to 15 kt becoming northeast 10 to 20 kt.
Waves 1 to 2 ft.
.FRIDAY NIGHT...Southeast winds 10 to 20 kt becoming south 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.
.SUNDAY...South gales to 35 kt. Chance of showers. Waves 6 to
9 ft occasionally to 12 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-262115-
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-
902 AM CDT Wed Aug 26 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Slight chance of showers and thunderstorms. Waves 4 to
6 ft occasionally to 8 ft subsiding to 3 to 5 ft.
.TONIGHT...West winds 10 to 20 kt becoming northwest 10 to 15 kt.
Waves 2 to 4 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming north 15 to
25 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...Northeast winds 10 to 20 kt diminishing to
10 to 15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.FRIDAY...Northeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.FRIDAY NIGHT...East winds 10 to 20 kt veering to southeast 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.
.SUNDAY...South gales to 35 kt. Chance of showers. Waves 6 to
9 ft occasionally to 12 ft.

$$

LMZ761-262115-
MAFOR 2616/
MICHIGAN NORTH 12530 11620 11720 11710 13720. A chance of showers
and thunderstorms this afternoon. Waves 3 to 5 feet subsiding to
2 to 4 feet this afternoon. Waves 1 to 3 feet tonight and
Thursday morning.

MICHIGAN SOUTH 11530 11520 11620 12720 12710 11820. Waves 3 to 5
feet subsiding to 2 to 4 feet this afternoon. Waves 1 to 3 feet
tonight and Thursday 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