677
FZUS63 KMKX 220800
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
300 AM CDT Tue Jul 22 2025

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...

Winds will increase to around 20 knots and veer southeast today
as low pressure around 29.5 inches approaches Minnesota from the
Central Plains. Breezy southerly winds up to 30 kt are expected
Wednesday. There are chances for storms starting Wednesday
morning and continuing through Friday along a frontal boundary.
Initially, Wednesday into Thursday morning, expect the front to
remain stationary across the northern half of the lake. Thursday
afternoon through Friday, expect the front to push southward,
bringing storms southeastward through the remainder of the open
waters. A low pressure trough around 29.8 inches will drop through
the area Thursday night into Friday, shifting winds to westerly.

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 Tue Jul 22 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 20 kt. Waves 3 to 5 ft.
.TONIGHT...South winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 3 to 5 ft.
.WEDNESDAY...South winds 15 to 25 kt increasing to 30 kt. Chance
of showers and thunderstorms. Waves 4 to 7 ft occasionally to
9 ft.
.WEDNESDAY NIGHT...South winds 15 to 25 kt becoming southwest
10 to 20 kt. Chance of showers and thunderstorms in the evening,
then chance of showers overnight. Waves 4 to 7 ft occasionally to
9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Chance of showers in the
morning, then showers likely with a chance of thunderstorms in
the afternoon. Waves 3 to 5 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt veering to north 5 to
10 kt. Chance of showers. Waves 2 to 4 ft.
.FRIDAY...North winds 10 to 15 kt. Waves 1 to 2 ft.
.SATURDAY...Southeast winds 5 to 10 kt becoming southwest 10 to
15 kt. Waves 1 ft or less.

$$

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 Tue Jul 22 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southeast winds 10 to 20 kt becoming south. Waves 3 to
5 ft.
.TONIGHT...Southeast winds 10 to 20 kt becoming south. Waves 3 to
5 ft.
.WEDNESDAY...South winds 15 to 25 kt increasing to 30 kt. Waves
4 to 7 ft occasionally to 9 ft.
.WEDNESDAY NIGHT...South winds 15 to 25 kt becoming southwest
10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to
3 to 5 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt becoming west 10 to
15 kt. Showers likely with a chance of thunderstorms. Waves 2 to
4 ft.
.FRIDAY...Northwest winds 10 to 15 kt becoming north. Chance of
showers. Waves 1 to 3 ft.
.SATURDAY...Southeast winds 5 to 10 kt becoming south 10 to
15 kt. Waves 1 to 2 ft.

$$

LMZ761-221515-
MAFOR 2210/
MICHIGAN NORTH 15420 11420 11430. Waves 2 to 4 feet building to 3
to 5 feet, then subsiding to 2 to 4 feet today. Waves 2 to 4 feet
tonight.

MICHIGAN SOUTH 12320 12420 12320 12420. Waves 2 to 4 feet
building to 3 to 5 feet, then subsiding to 2 to 4 feet today.
Waves 2 to 4 feet tonight.

$$


Cronce

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

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