287
FZUS63 KMKX 231957
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
257 PM CDT Thu Jul 23 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...

Light and variable winds are expected through tonight as high
pressure around 30.1 inches builds across the Lake. Southerly
winds develop into Friday as high pressure moves into the
northeastern United States. A 29.5 inch low pressure system will
move quickly from the Canadian Great Plains toward Quebec Friday
through Saturday, maintaining south to southwest winds. Southerly
gusts up to 30 kt are expected over the north half.

The low will pull a cold front into the western Great Lakes on
Saturday, with the boundary slowly advancing south across the
waters Saturday night. This will result in thunderstorm chances
across the northern two-thirds. The front then becomes stationary
through the middle of next week, with switches between northerly
and southern winds at times. Additional rounds of storms are
possible, and some may become severe.

LMZ261-362-364-366-563-565-567-868-240330-
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-
257 PM CDT Thu Jul 23 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Waves 1 to 3 ft building to 3 to 5 ft.
.FRIDAY NIGHT...South winds to 30 kt becoming southwest. Waves
3 to 5 ft.
.SATURDAY...Southwest winds to 30 kt. Chance of showers in the
afternoon. Waves 3 to 5 ft.
.SATURDAY NIGHT...South winds 15 to 25 kt becoming west 10 to
15 kt overnight. Chance of showers. Waves 3 to 5 ft subsiding to
2 to 4 ft.
.SUNDAY...Northwest winds 10 to 15 kt backing to south 10 to
20 kt. Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Showers likely with a chance of thunderstorms. Waves 2 to 4 ft.
.MONDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Chance
of showers and thunderstorms. Waves 3 to 5 ft.
.TUESDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-240330-
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-
257 PM CDT Thu Jul 23 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Waves 1 to 3 ft.
.FRIDAY...Southwest winds 5 to 10 kt becoming south 10 to 15 kt
late in the morning, then increasing to 10 to 20 kt early in the
afternoon increasing to 15 to 25 kt late. Waves 1 to 2 ft
building to 2 to 4 ft.
.FRIDAY NIGHT...South winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.SATURDAY...Southwest winds 15 to 25 kt becoming south. Waves
3 to 5 ft.
.SATURDAY NIGHT...South winds 15 to 25 kt becoming southwest
10 to 15 kt overnight. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SUNDAY...West winds 10 to 15 kt becoming southwest 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Chance of showers and thunderstorms. Waves 2 to 4 ft.
.MONDAY...Southwest winds 15 to 25 kt. Chance of showers. Waves
3 to 5 ft.
.TUESDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
4 to 6 ft occasionally to 8 ft.

$$

LMZ761-240330-
MAFOR 2322/
MICHIGAN NORTH 13530 14520 11430. Waves 1 to 3 feet building to 2
to 4 feet, then subsiding to 1 to 3 feet tonight. Waves 2 feet or
less building to 2 to 4 feet Friday.

MICHIGAN SOUTH 11420 12410 11510 11500 11410 11420 11430. Waves 2
feet or less tonight. Waves 1 to 3 feet Friday.

$$


MH

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

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