946
FZUS63 KMKX 211343
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
843 AM 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...

Low pressure tracking east through Ontario and into Quebec is
dragging a secondary backdoor cold front down the lake this
morning through the afternoon. Breezy northwest winds will veer
north behind the secondary cold front through early evening, with
a few gusts to gale force possible behind the front. Winds are
expected to gradually weaken through the day Wednesday, as high
pressure around 30.2 inches builds into the Great Lakes region
from the west.

LMZ261-362-364-366-563-565-567-868-212115-
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-
843 AM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...West winds 15 to 25 kt becoming northwest to
30 kt. Chance of showers this afternoon. Waves 4 to 6 ft
occasionally to 8 ft building to 6 to 9 ft occasionally to 12 ft.
.TONIGHT...Northwest winds to 30 kt. Waves 7 to 10 ft
occasionally to 13 ft subsiding to 5 to 8 ft occasionally to
10 ft.
.WEDNESDAY...Northwest winds to 30 kt becoming north 15 to 25 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 kt becoming west
10 to 15 kt overnight. 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 2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 15 to 25 kt. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.SATURDAY...Southwest winds to 30 kt becoming south. Waves 2 to
4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-212115-
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-
843 AM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...West winds 15 to 25 kt becoming northwest to
30 kt. Slight chance of showers and thunderstorms this afternoon.
Waves 4 to 7 ft occasionally to 9 ft.
.TONIGHT...North winds to 30 kt diminishing to 15 to 25 kt. Waves
6 to 9 ft occasionally to 12 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 6 ft occasionally to
8 ft.
.WEDNESDAY NIGHT...North winds 15 to 25 kt becoming northwest
10 to 15 kt overnight. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.THURSDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 2 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 1 to 2 ft building to 1 to 3 ft.

$$

LMZ761-212115-
MAFOR 2116/
MICHIGAN NORTH 13740 12840 12740 11730. A chance of showers this
afternoon. Waves 2 to 4 feet building to 5 to 8 feet this
afternoon. Waves 6 to 9 feet subsiding to 4 to 7 feet tonight.
Waves 3 to 6 feet Wednesday morning.

MICHIGAN SOUTH 11730 11740 13840 13830. Waves 3 to 6 feet this
afternoon. Waves 6 to 10 feet tonight. Waves 5 to 8 feet
Wednesday morning.

$$


Kuroski

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

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