251
FZUS63 KMKX 220800
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
300 AM CDT Wed Jul 22 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 early this morning will remain through much of
the predawn hours before steadily subsiding after sunrise. High
pressure around 30.1 inches will build into the northern
Mississippi River Valley from the Great Plain today. 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.

LMZ261-362-364-366-563-565-567-868-221515-
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-
300 AM CDT Wed Jul 22 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northwest winds to 30 kt. Waves 4 to 7 ft occasionally
to 9 ft subsiding to 3 to 5 ft.
.TONIGHT...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 15 kt increasing to 10 to 20 kt late
in the morning, then becoming southwest 15 to 25 kt early in the
afternoon becoming south late. 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 increasing to 15 to 25 kt.
Waves 3 to 5 ft.
.FRIDAY NIGHT...South winds 15 to 25 kt becoming southwest. Waves
4 to 6 ft occasionally to 8 ft.
.SATURDAY...Southwest winds to 30 kt becoming south. Chance of
showers. Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY...West winds 10 to 20 kt becoming southwest 15 to 25 kt.
Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-221515-
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-
300 AM CDT Wed Jul 22 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...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.
.TONIGHT...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 3 to 5 ft
subsiding to 1 to 3 ft.
.THURSDAY...West winds 5 to 10 kt becoming southwest late in the
morning, then becoming southwest 10 to 15 kt early in the
afternoon becoming south 10 to 20 kt late. Waves 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 15 kt becoming south 15 to 25 kt
in the afternoon. Waves 1 to 3 ft building to 2 to 4 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt becoming southwest. Waves
3 to 5 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Waves 3 to 5 ft.
.SUNDAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Waves 2 to 4 ft.

$$

LMZ761-221515-
MAFOR 2210/
MICHIGAN NORTH 14740 11730 11620 12610. Waves 4 to 7 feet
subsiding to 2 to 4 feet today. Waves 1 to 3 feet subsiding to 1
foot or less tonight.

MICHIGAN SOUTH 14830 11830 11810 12700. Waves 5 to 8 feet
subsiding to 3 to 6 feet today. Waves 2 to 4 feet subsiding to 1
to 3 feet tonight.

$$


Patterson

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

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