957
FZUS63 KMKX 241936
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
236 PM CDT Sun Aug 24 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...

Low pressure of 29.4 inches will remain over James Bay through
Monday and thus brisk northwest winds will persist through Monday.

There is a potential for waterspouts across the lake today and
tomorrow. Through Monday the best potential will be across the
northern and eastern portions of the lake.

High pressure of 30.2 inches will build into the region on
Tuesday, ending the risk for waterspouts and bringing lighter
winds to the lake. Winds will briefly turn westerly and
southwesterly on Wednesday as the high moves east of the region,
before another cold front pushes through the lake on Thursday.

LMZ261-362-364-366-563-565-567-868-250315-
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-
236 PM CDT Sun Aug 24 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of waterspouts. Chance of showers and slight chance
of thunderstorms this evening, then slight chance of showers
overnight. Waves 4 to 6 ft occasionally to 8 ft.
.MONDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Slight chance of waterspouts. Waves 3 to 5 ft subsiding to 2 to
4 ft.
.MONDAY NIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TUESDAY...Northwest winds 10 to 20 kt. Waves 1 to 3 ft.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt becoming west 10 to
15 kt. Waves 1 to 3 ft.
.WEDNESDAY...West winds 10 to 20 kt becoming southwest 15 to
25 kt. Waves 2 to 4 ft.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 kt becoming west
10 to 20 kt. Chance of showers. Waves 2 to 4 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming north. Chance of
showers. Waves 2 to 4 ft.
.FRIDAY...Northeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-250315-
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-
236 PM CDT Sun Aug 24 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of waterspouts. Chance of showers and slight chance
of thunderstorms this evening, then chance of showers overnight.
Waves 5 to 8 ft occasionally to 10 ft.
.MONDAY...Northwest winds 10 to 20 kt. Slight chance of showers
in the morning. Slight chance of waterspouts. Waves 4 to 7 ft
occasionally to 9 ft.
.MONDAY NIGHT...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.TUESDAY...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY...West winds 10 to 20 kt. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 kt becoming west.
Waves 2 to 4 ft.
.THURSDAY...West winds 10 to 20 kt becoming northwest. Waves 2 to
4 ft.
.FRIDAY...Northeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft.

$$

LMZ761-250315-
MAFOR 2422/
MICHIGAN NORTH 13730 12720 13730. A chance of waterspouts
tonight. A chance of showers this evening. Waves 3 to 5 feet
tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Monday.

MICHIGAN SOUTH 13730 14720 11720. A chance of waterspouts
tonight. A chance of showers tonight. Waves 3 to 6 feet building
to 4 to 7 feet, then subsiding to 3 to 6 feet tonight. Waves 3 to
6 feet Monday.

$$


Boxell

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

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