372
FZUS63 KMKX 030203
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
903 PM CDT Wed Sep 2 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.

LMZ261-362-364-366-563-565-567-868-030915-
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-
903 PM CDT Wed Sep 2 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...East winds 5 to 10 kt. Slight chance of
showers and thunderstorms overnight. Waves 1 ft or less.
.THURSDAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt.
Chance of showers and slight chance of thunderstorms. Waves 1 to
2 ft.
.THURSDAY NIGHT...Northeast winds 5 to 10 kt becoming east.
Chance of showers. Waves 1 to 2 ft.
.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 overnight. Waves 1 ft or less.
.SATURDAY...East winds 10 to 15 kt. 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 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-030915-
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-
903 PM CDT Wed Sep 2 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$

LMZ761-030915-
MAFOR 0304/
MICHIGAN NORTH 14200 11100 11110 12100. A chance of showers
Thursday. Waves 1 foot or less.

MICHIGAN SOUTH 14410 11510 12110 11210. A chance of showers and
thunderstorms overnight. A chance of showers Thursday morning. A
chance of showers and thunderstorms Thursday evening. Waves 1
foot or less.

$$


Wagner

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

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