975
FZUS63 KMKX 031504
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
1004 AM CDT Thu Sep 3 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...

A frontal boundary will remain across the Great Lakes region
through Friday. As this frontal boundary waffles north to south
across the lake from day to day, generally east to northeast winds
are expected north of the front, with east to southeast winds
south of the front. On and off thunderstorms will be possible
along and north of this frontal boundary through at least Friday
night. Then high pressure around 30.1 inches builds over Hudson
Bay on Saturday, while low pressure around 29.6 inches moves into
the northern Great Plains. Similar to earlier week storms,
widespread severe weather is not anticipated, though isolated
stronger storms with hail and gusty winds are possible.

LMZ261-362-364-366-563-565-567-868-032115-
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-
1004 AM CDT Thu Sep 3 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...East winds 5 to 10 kt increasing to 10 to 15 kt.
Scattered showers and thunderstorms late this morning, then
chance of showers and thunderstorms this afternoon. Waves 1 ft or
less.
.TONIGHT...Northeast winds 5 to 10 kt becoming east. Chance of
showers and slight chance of thunderstorms in the evening, then
chance of showers and thunderstorms overnight. Waves 1 ft or
less.
.FRIDAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt.
Waves 1 to 2 ft.
.FRIDAY NIGHT...Northeast winds 10 to 15 kt becoming east 5 to
10 kt. Chance of showers. Waves 1 to 2 ft.
.SATURDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to
2 ft.
.SATURDAY NIGHT...East winds 10 to 15 kt becoming southeast.
Waves 1 to 3 ft.
.SUNDAY...Southeast winds 10 to 15 kt becoming south. Waves 1 to
3 ft.
.MONDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-032115-
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-
1004 AM CDT Thu Sep 3 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 10 to 20 kt backing to east 10 to
15 kt. Isolated showers and thunderstorms late this morning, then
chance of showers and thunderstorms this afternoon. Waves 1 ft or
less.
.TONIGHT...Southeast winds 10 to 15 kt. Chance of thunderstorms
and slight chance of showers in the evening, then showers likely
with a chance of thunderstorms overnight. Waves 1 to 2 ft.
.FRIDAY...Southeast winds 10 to 15 kt backing to northeast 5 to
10 kt. Chance of showers and thunderstorms in the morning. Waves
1 to 2 ft.
.FRIDAY NIGHT...Northeast winds 5 to 10 kt becoming east 10 to
15 kt. Chance of showers and thunderstorms. Waves 1 to 2 ft.
.SATURDAY...East winds 10 to 15 kt. Waves 1 to 3 ft.
.SATURDAY NIGHT...East winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...Southeast winds 10 to 15 kt becoming east. Waves 2 to
4 ft.
.MONDAY...Southeast winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ761-032115-
MAFOR 0316/
MICHIGAN NORTH 11109 11110 11200 11100 12200 12210. Waves 1 foot
or less.

MICHIGAN SOUTH 11510 12210 11310 11216 11316 11310 11410. A
chance of thunderstorms. Waves 2 feet or less.

$$


Cronce

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

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