256
FZUS63 KMKX 081359
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
859 AM CDT Tue Sep 8 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...

29.4 inch low pressure is centered over the Canadian Great Plains
this morning, with 30.4 inch high pressure positioned along the
eastern shores of the Hudson Bay. Generally light southerly winds
thus prevail across the open waters. Southerly winds will increase
today into tonight as the aforementioned low shifts northeast
toward the Hudson Bay. A cold front will move across Lake Michigan
on Wednesday, bringing a generally westerly wind shift across the
lake. Periods of showers and occasional thunderstorms will
accompany the approaching/passing surface front this afternoon
through Wednesday morning. Severe weather isn`t expected.

A new area of 30.1 inch high pressure will move from the northern
Great Plains across Lake Michigan Wednesday night through Thursday
night, bringing a period of light and variable winds to the
waters. The next area of 29.3 inch low pressure will shift from
the Canadian Great Plains across the Hudson Bay Friday afternoon
through Saturday night, bringing increasing southwest winds. A few
gale force gusts are possible during this time frame, particularly
over the northern third of Lake Michigan. Will be monitoring
trends through late week for possible headlines. A cold front will
move over Lake Michigan Sunday morning, bringing a northwest wind
shift to the waters.

LMZ261-362-364-366-563-565-567-868-082130-
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-
859 AM CDT Tue Sep 8 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds 10 to 20 kt increasing to 30 kt.
Chance of showers through mid morning, then slight chance of
showers this afternoon. Waves 4 to 6 ft occasionally to 8 ft.
.TONIGHT...South winds to 30 kt becoming southwest. Chance of
showers and thunderstorms. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...Southwest winds to 30 kt. Chance of showers in the
morning. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...West winds to 30 kt becoming northwest 15 to
25 kt. Waves 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 10 to 15 kt becoming south.
Waves 1 to 2 ft.
.FRIDAY...South winds 15 to 25 kt increasing to 30 kt. Waves 2 to
4 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...Southwest gales to 35 kt diminishing to 30 kt. Chance
of showers. Waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-082130-
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-
859 AM CDT Tue Sep 8 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 10 to 20 kt increasing to 15 to
25 kt. Chance of showers through mid morning. Waves 3 to 5 ft.
.TONIGHT...South winds 15 to 25 kt becoming southwest. Slight
chance of showers and thunderstorms in the evening, then chance
of showers and slight chance of thunderstorms overnight. Waves
3 to 5 ft.
.WEDNESDAY...Southwest winds 15 to 25 kt becoming west 10 to
20 kt. Showers likely in the morning. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.WEDNESDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Waves 2 to 4 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming north. Waves
2 to 4 ft.
.THURSDAY NIGHT...North winds 5 to 10 kt veering to southeast
10 to 15 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt increasing to 30 kt. Waves 2 to
4 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...Southwest winds to 30 kt becoming west. Waves 5 to
8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.

$$

LMZ761-082130-
MAFOR 0816/
MICHIGAN NORTH 14430 11540 11546 11540 11530. A chance of
thunderstorms tonight. Waves 2 to 4 feet building to 3 to 5 feet
this afternoon. Waves 3 to 5 feet tonight and Wednesday morning.

MICHIGAN SOUTH 11420 12430 12420 11530 12536. Waves 2 to 4 feet
building to 3 to 5 feet this afternoon. Waves 3 to 5 feet tonight
and Wednesday morning.

$$


Quigley

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

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