572
FZUS63 KMKX 290727
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
227 AM CDT Fri Aug 29 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...

30.2 inch high pressure is centered over Lake Superior early this
morning, resulting in east-northeast winds across the open waters
of Lake Michigan. The high will settle over the Lake Michigan
vicinity late this morning, resulting in decreasing northeasterly
wind speeds. Winds will become light and variable tonight through
Saturday as the area of high pressure drifts into Lower Michigan.
The high will gradually break down Sunday into early next week,
though light and variable winds will persist in the absence of any
organized areas of low pressure over the western Great Lakes and
northern Great Plains. Prevailing south to southwest winds will
become established Tuesday and Tuesday night as 29.9 inch low
pressure approaches Lake Michigan from Ontario. Said low is
forecast to drag a strong cold front across the waters at some
point Wednesday through Wednesday night, bringing a gusty
northwest wind shift to all of Lake Michigan. Gusty northwest
winds will continue through most of Thursday. While the current
forecast keeps gusts below gale force next Wednesday-Thursday
across the open waters, the potential for increasing trends will
be monitored as this portion of the period draws closer. Showers
and thunderstorms will accompany the passing cold front Wednesday
into Thursday, with details regarding possible strong thunderstorm
wind gusts or waterspouts unclear at this time. Will continue to
monitor trends over the coming forecasts.

LMZ261-362-364-366-563-565-567-868-291515-
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-
227 AM CDT Fri Aug 29 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northeast winds 5 to 10 kt becoming north 10 to 15 kt.
Waves 1 to 3 ft subsiding to 1 to 2 ft.
.TONIGHT...North winds 10 to 15 kt backing to southwest. Waves
1 ft or less.
.SATURDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
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.
.SUNDAY NIGHT...Southwest winds 5 to 10 kt becoming south. Waves
nearly calm.
.MONDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves nearly calm.
.TUESDAY...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-291515-
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-
227 AM CDT Fri Aug 29 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northeast winds 10 to 15 kt becoming north. Waves 3 to
5 ft subsiding to 1 to 3 ft.
.TONIGHT...North winds 10 to 15 kt becoming east. Waves 1 to
2 ft.
.SATURDAY...East winds 5 to 10 kt becoming northeast. Waves 1 ft
or less.
.SATURDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
nearly calm.
.SUNDAY...East winds 5 to 10 kt becoming northeast. Waves nearly
calm.
.SUNDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 ft or less.
.MONDAY...East winds 5 to 10 kt becoming northeast. Waves nearly
calm.
.TUESDAY...Southeast winds 5 to 10 kt becoming south 10 to 15 kt.
Waves 1 to 2 ft.

$$

LMZ761-291515-
MAFOR 2910/
MICHIGAN NORTH 13100 12810 11100 11300 11500. Waves 1 to 3 feet
subsiding to 1 foot or less today. Waves 1 foot or less tonight.

MICHIGAN SOUTH 11110 11100 11110 12810 12100 11200. Waves 3 to 5
feet subsiding to 1 to 3 feet today. Waves 2 feet or less
tonight.

$$


Quigley

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

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