869
FZUS63 KMKX 220123
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
823 PM CDT Tue Jul 21 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...

Gusty north winds continue late this evening across the open waters
behind a departing cold front. Gusts are expected to remain at or
below 30 kts across the majority of the lake, though a few gusts
approaching gale force remain possible through the predawn hours
over the northeast half of the waters. Winds will steadily subside
through the day Wednesday as 30.1 inch high pressure builds into
the northern Mississippi River Valley from the Great Plains. The
high will cross southern Lake Michigan Thursday morning,
progressing into the northeastern United States Thursday night
into Friday. Progression of the high will result in a south to
southwest wind shift across the waters.

29.5 inch low pressure will move quickly from the Canadian Great
Plains toward Quebec Friday through Saturday, maintaining south to
southwest winds over Lake Michigan. The low will attempt to pull
a cold front into the western Great Lakes by Sunday, with the
boundary slowly advancing south across the waters through Monday.
The approaching/passing front will result in returning
thunderstorm chances Saturday night through Monday, in addition to
a northerly wind shift by Monday afternoon.

LMZ261-362-364-366-563-565-567-868-220915-
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-
823 PM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...North winds to 30 kt becoming northwest. Waves
8 to 11 ft occasionally to 14 ft subsiding to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...Northwest winds to 30 kt. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 kt becoming west
10 to 15 kt. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.THURSDAY...West winds 10 to 20 kt becoming southwest 15 to
25 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...Southwest winds 15 to 25 kt. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Waves 2 to 4 ft.
.FRIDAY NIGHT...South winds 15 to 25 kt becoming southwest. Waves
2 to 4 ft.
.SATURDAY...Southwest winds to 30 kt becoming south. Waves 3 to
5 ft building to 4 to 6 ft occasionally to 8 ft.
.SUNDAY...West winds 10 to 20 kt becoming southwest 15 to 25 kt.
Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220915-
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-
823 PM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...North winds to 30 kt diminishing to 15 to
25 kt. Waves 7 to 10 ft occasionally to 13 ft building to 8 to
11 ft occasionally to 14 ft, then subsiding to 7 to 10 ft
occasionally to 13 ft.
.WEDNESDAY...North winds 15 to 25 kt. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt becoming northwest
10 to 15 kt late in the evening, then diminishing to 5 to 10 kt
after midnight increasing to 10 to 15 kt late. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft.
.THURSDAY...West winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt becoming southwest
10 to 15 kt. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt becoming southwest. Waves
2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Waves 1 to 3 ft building to 3 to 5 ft.
.SUNDAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Waves 2 to 4 ft.

$$

LMZ761-220915-
MAFOR 2204/
MICHIGAN NORTH 11840 14740 11740 11730 11620. Waves 6 to 10 feet
subsiding to 5 to 8 feet overnight. Waves 3 to 6 feet subsiding
to 2 to 4 feet Wednesday. Waves 1 to 3 feet Wednesday evening.

MICHIGAN SOUTH 11840 15830 11810. Waves 8 to 11 feet subsiding to
6 to 9 feet overnight. Waves 5 to 8 feet subsiding to 3 to 6 feet
Wednesday. Waves 3 to 6 feet subsiding to 2 to 4 feet Wednesday
evening.

$$


Quigley

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

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