011
FZUS63 KMKX 221400
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
900 AM CDT Fri Aug 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...

High pressure around 30.1 inches will linger today and begin
weakening. South to southwest winds are expected across the lake
today, becoming breezy across the northern two thirds of the open
waters this afternoon. A strong cold front will then move
northwest to southeast tonight into Saturday morning. Expect
scattered showers and isolated thunderstorms along this front.

Winds shift to become west northwest and brisk Saturday through
Monday, as low pressure strengthens to around 29.5 inches in
northeastern Ontario. There will be a potential for waterspouts
across the northern half of the lake Sunday and Monday, as temps
drop and cloud cover increases. Then winds weaken and become
northwest into Tuesday.

LMZ261-362-364-366-563-565-567-868-222115-
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-
900 AM CDT Fri Aug 22 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southwest winds 10 to 15 kt increasing to 15 to
25 kt. Waves 2 to 4 ft.
.TONIGHT...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of showers and thunderstorms. Waves 2 to 4 ft.
.SATURDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY NIGHT...Northwest winds 10 to 20 kt becoming west.
Waves 2 to 4 ft.
.SUNDAY...West winds 15 to 25 kt. Slight chance of waterspouts.
Chance of showers in the morning. Waves 3 to 5 ft.
.SUNDAY NIGHT...Northwest winds 15 to 25 kt. Slight chance of
waterspouts. Chance of showers. Waves 3 to 5 ft.
.MONDAY...Northwest winds 15 to 25 kt increasing to 30 kt. Slight
chance of waterspouts. Chance of showers. Waves 3 to 5 ft.
.TUESDAY...Northwest winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-222115-
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-
900 AM CDT Fri Aug 22 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...West winds 5 to 10 kt backing to south. Waves
1 to 2 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest. Slight
chance of showers and thunderstorms overnight. Waves 1 to 3 ft.
.SATURDAY...West winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY NIGHT...Northwest winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.SUNDAY...Northwest winds 15 to 25 kt becoming west. Waves 4 to
6 ft occasionally to 8 ft.
.SUNDAY NIGHT...Northwest winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.MONDAY...Northwest winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.TUESDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to
4 ft.

$$

LMZ761-222115-
MAFOR 2216/
MICHIGAN NORTH 12520 12530 12520 12620. A chance of showers and
thunderstorms tonight. Waves 1 to 3 feet this afternoon. Waves 2
to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet
Saturday morning.

MICHIGAN SOUTH 11500 11510 12410 11510 11520 12620. Waves 2 feet
or less this afternoon. Waves 1 to 3 feet tonight. Waves 1 to 3
feet building to 2 to 4 feet Saturday morning.

$$
Wood

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

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