169
FZUS63 KMKX 210802
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
302 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 is dragging a cold
front across the lake early this morning. Gusty south to
southwest winds ahead of the front are expected. Winds will veer
northwest behind the cold front and remain gusty. Winds then veer
north tonight, with a few gusts to gale force possible. Winds are
expected to gradually weaken by Thursday, as high pressure around
30.2 inches builds into the Great Lakes region.

LMZ261-362-364-366-563-565-567-868-211530-
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-
302 AM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...West winds 15 to 25 kt becoming northwest to 30 kt from
late morning on. Slight chance of showers this morning, then
slight chance of showers and thunderstorms this afternoon. Waves
4 to 7 ft occasionally to 9 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 6 to 9 ft occasionally to
12 ft.
.WEDNESDAY...North winds to 30 kt. Waves 5 to 8 ft occasionally
to 10 ft subsiding to 3 to 5 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.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-211530-
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-
302 AM CDT Tue Jul 21 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...West winds 15 to 25 kt becoming northwest to 30 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.TONIGHT...North winds to 30 kt. Slight chance of showers in the
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 to 30 kt. Waves 7 to 10 ft occasionally
to 13 ft subsiding to 5 to 8 ft occasionally to 10 ft.
.WEDNESDAY NIGHT...North winds 15 to 25 kt becoming northwest
5 to 10 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.

$$

LMZ761-211530-
MAFOR 2110/
MICHIGAN NORTH 11630 11730 13740 12840 11740. Waves 3 to 6 feet
building to 5 to 8 feet today. Waves 5 to 9 feet tonight.

MICHIGAN SOUTH 12630 11730 11740 14840. Waves 4 to 7 feet
subsiding to 3 to 6 feet, then building to 4 to 7 feet today.
Waves 6 to 9 feet building to 7 to 11 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