486
FZUS63 KMKX 091923
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
223 PM CDT Sat Aug 9 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...

29.6 inch low pressure will linger across Manitoba into this
evening, with 30.2 inch high pressure remaining centered over the
Mid-Atlantic states. Placed between the two surface features,
breezy southerly winds will continue across the open waters
through the first half of tonight. Prevailing southerlies will
gradually decrease after midnight as the aforementioned surface
high migrates east into the Atlantic Ocean. Generally southerly
winds will continue into the day on Sunday as a weak surface front
moves into western Wisconsin, ultimately stopping short of the
open waters. Periods of showers and storms are forecast this
evening through Sunday night. Widespread severe weather is not
expected, though a few storms could produce brief gusty winds.
Winds will trend south to southwesterly during the day Monday as
29.6 inch low pressure moves into the Hudson Bay.

LMZ261-362-364-366-563-565-567-868-100315-
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-
223 PM CDT Sat Aug 9 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds 15 to 25 kt becoming south 10 to
20 kt. Chance of showers and thunderstorms this evening, then
chance of showers and slight chance of thunderstorms overnight.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
.SUNDAY...South winds 10 to 20 kt. Chance of showers and slight
chance of thunderstorms. Waves 2 to 4 ft.
.SUNDAY NIGHT...Southwest winds 10 to 20 kt diminishing to 10 to
15 kt. Chance of showers. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt. Chance of showers. Waves
1 to 3 ft.
.MONDAY NIGHT...Southwest winds 10 to 15 kt. Chance of showers.
Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 20 kt. Chance of showers. Waves
1 to 2 ft.
.TUESDAY NIGHT...West winds 10 to 20 kt becoming northwest 5 to
10 kt. Waves 1 to 2 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt becoming north. Waves
1 to 2 ft.
.THURSDAY...Southeast winds 10 to 15 kt. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-100315-
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-
223 PM CDT Sat Aug 9 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 15 to 25 kt diminishing to 10 to 20 kt.
Chance of showers and thunderstorms this evening, then chance of
showers and slight chance of thunderstorms overnight. Waves 4 to
7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
.SUNDAY...South winds 10 to 20 kt. Slight chance of showers in
the morning, then chance of showers and thunderstorms in the
afternoon. Waves 2 to 4 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt. Chance of showers and
thunderstorms. Waves 2 to 4 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming south. Chance of
showers and thunderstorms. Waves 1 to 3 ft.
.MONDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Chance of showers and thunderstorms. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 15 kt. Chance of showers. Waves
1 to 2 ft.
.TUESDAY NIGHT...Southwest winds 10 to 15 kt becoming west 5 to
10 kt. Waves 1 to 2 ft.
.WEDNESDAY...Northwest winds 5 to 10 kt becoming north 10 to
15 kt. Waves 1 to 2 ft.
.THURSDAY...East winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.

$$

LMZ761-100315-
MAFOR 0922/
MICHIGAN NORTH 12530 15420. A chance of showers and thunderstorms
this evening, then a chance of showers overnight. A chance of
showers Sunday. Waves 4 to 7 feet subsiding to 2 to 4 feet
tonight. Waves 1 to 3 feet Sunday.

MICHIGAN SOUTH 12430 15420. A chance of showers early this
evening, then a chance of showers and thunderstorms this evening.
A chance of showers overnight. A chance of showers and
thunderstorms Sunday afternoon. Waves 3 to 6 feet subsiding to 1
to 3 feet tonight. Waves 1 to 3 feet Sunday.

$$


Quigley

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

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