460
FZUS63 KMKX 040739
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
239 AM 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...

High pressure of 30.1 inches over the eastern Great Lakes will
gradually move east today, with broad troughing of 29.6 inches
over the central and northern Great Plains. South to southwest
winds are expected today, with speeds increasing on Saturday,
ahead of a cold front, which will pass through the lake late
Saturday night.  Northwest winds will become north behind this
front Sunday and Sunday night.

Thunderstorms will remain possible at times this morning, mainly
over the southern half of the lake. Better chances for storms are
expected Saturday night and early Sunday with the front.

Winds will remain from the north on Monday as weak high pressure
noses into the region, before southerly flow returns on Tuesday.

LMZ261-362-364-366-563-565-567-868-041515-
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-
239 AM CDT Fri Jul 4 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Slight chance of showers and thunderstorms this afternoon. Waves
1 to 3 ft.
.TONIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 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.
Showers likely with a chance of thunderstorms. Waves 4 to 6 ft
occasionally to 8 ft.
.SUNDAY...West winds 15 to 25 kt becoming north. Chance of
showers in the morning. 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.
.TUESDAY...Southwest winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-041515-
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-
239 AM CDT Fri Jul 4 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 10 to 15 kt. Chance of showers and
thunderstorms this morning. Waves 1 to 3 ft.
.TONIGHT...South winds 10 to 15 kt becoming southwest. Waves 1 to
3 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 3 to 5 ft building to 4 to 6 ft occasionally to
8 ft.
.SATURDAY NIGHT...South winds 15 to 25 kt becoming southwest.
Chance of showers and thunderstorms. Waves 4 to 6 ft occasionally
to 8 ft.
.SUNDAY...Southwest winds 15 to 25 kt becoming northwest 10 to
20 kt. Chance of showers in the morning, then chance of showers
and thunderstorms in the afternoon. Waves 4 to 6 ft occasionally
to 8 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 2 to 4 ft.
.TUESDAY...Southwest winds 5 to 10 kt becoming south 10 to 15 kt.
Waves 1 to 2 ft.

$$

LMZ761-041515-
MAFOR 0410/
MICHIGAN NORTH 11310 14410 13420. A chance of showers early this
morning. Waves 1 to 3 feet today. Waves 1 to 3 feet building to 2
to 4 feet tonight.

MICHIGAN SOUTH 11400 11510 14410 11410 11510. A chance of showers
and thunderstorms this morning. Waves 2 feet or less today. Waves
1 to 3 feet tonight.

$$


Boxell

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

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