260
FZUS63 KMKX 050148
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
848 PM CDT Fri Jul 4 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...

Southeasterly winds expected through tonight as high pressure of
30.1 inches lingers over the Northeast U.S. Southeasterly winds
increase and become southerly into Saturday as low pressure of
29.7 inches progresses eastward across Lake Superior, bringing a
cold front southward and shifting winds to northwesterly late Saturday
night into Sunday morning. Scattered thunderstorms are expected
ahead of and along this front. Winds will turn northerly Sunday
night as high pressure of 30.1 inches builds into southern
Ontario. Northerly winds will linger through Monday before
southerly flow returns on Tuesday.

LMZ261-362-364-366-563-565-567-868-050930-
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-
848 PM CDT Fri Jul 4 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds 10 to 20 kt becoming southwest.
Waves 2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...South winds to 30 kt becoming southwest 15 to
25 kt late in the evening, then diminishing to 10 to 20 kt after
midnight becoming west late. Showers likely with a chance of
thunderstorms. Waves 4 to 6 ft occasionally to 8 ft subsiding to
3 to 5 ft.
.SUNDAY...Northwest winds 15 to 25 kt becoming north. Chance of
showers. Waves 3 to 5 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 2 to 4 ft.
.MONDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming southeast
5 to 10 kt. Waves 1 to 2 ft.
.TUESDAY...South winds 5 to 10 kt becoming southwest 10 to 15 kt.
Waves 1 ft or less.
.WEDNESDAY...Northeast winds 10 to 15 kt. Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-050930-
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-
848 PM CDT Fri Jul 4 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 10 to 20 kt becoming southwest.
Waves 1 to 3 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 2 to 4 ft building to 3 to 5 ft.
.SATURDAY NIGHT...South winds 15 to 25 kt becoming southwest
10 to 20 kt. Chance of showers and thunderstorms. Waves 3 to
5 ft.
.SUNDAY...West winds 10 to 20 kt becoming north 15 to 25 kt.
Chance of showers in the morning, then chance of showers and
thunderstorms in the afternoon. Waves 3 to 5 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 3 to 5 ft.
.MONDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 2 to 4 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 5 to 10 kt becoming south 10 to 15 kt.
Waves 1 ft or less.
.WEDNESDAY...East winds 5 to 10 kt becoming northeast 10 to
15 kt. Waves 1 to 2 ft.

$$

LMZ761-050930-
MAFOR 0504/
MICHIGAN NORTH 11420 12520 12430 11440 11446 11536. A chance of
thunderstorms Saturday evening. Waves 1 to 3 feet overnight.
Waves 1 to 3 feet building to 3 to 5 feet Saturday. Waves 3 to 6
feet Saturday evening.

MICHIGAN SOUTH 12410 11510 11420 13430 11530. A chance of showers
and thunderstorms Saturday evening. Waves 2 feet or less
overnight. Waves 1 to 3 feet building to 2 to 4 feet Saturday.
Waves 2 to 4 feet building to 3 to 5 feet Saturday evening.

$$


MH

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

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