972
FZUS63 KMKX 211949
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
249 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...

Low pressure near 29.3 inches will move eastward across the
James Bay though this afternoon which will bring a secondary
cold front across the lake through tonight. Breezy northwest
winds are expected and will veer to be from the north behind the
cold front. Gusts are expected with a gale force wind possible
for a brief period behind the front. Wind speeds will start to
decrease later tonight into Wednesday as high pressure near 30.1
inches begins to build into the region from the west.

LMZ261-362-364-366-563-565-567-868-220330-
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-
249 PM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...North gales to 35 kt becoming northwest to 30 kt.
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 becoming north 15 to 25 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 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 2 to 4 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
1 to 3 ft.
.SATURDAY...Southwest winds to 30 kt becoming south. Waves 2 to
4 ft.
.SUNDAY...West winds 10 to 20 kt becoming southwest 15 to 25 kt.
Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220330-
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-
249 PM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...North winds to 30 kt diminishing to 15 to 25 kt.
Slight chance of showers this evening. 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 diminishing to 5 to
10 kt after midnight, then becoming northwest 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 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 2 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt becoming southwest. Waves
1 to 3 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Waves 1 to 2 ft building to 1 to 3 ft.
.SUNDAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Waves 3 to 5 ft.

$$

LMZ761-220330-
MAFOR 2122/
MICHIGAN NORTH 12850 11840 11740 11730 13830. Waves 5 to 9 feet
building to 6 to 10 feet, then subsiding to 5 to 8 feet tonight.
Waves 3 to 6 feet subsiding to 2 to 4 feet Wednesday.

MICHIGAN SOUTH 13840 14830 11830. Waves 3 to 6 feet building to 8
to 11 feet, then subsiding to 6 to 9 feet tonight. Waves 5 to 8
feet subsiding to 3 to 6 feet Wednesday.

$$


Soergel/Kuroski

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

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