390
FZUS63 KMKX 040155
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
855 PM CDT Sun Aug 3 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...

No major changes to the going forecast as high pressure around
30.2 inches will remain over the Great Lakes Region through
Tuesday. Light and variable winds are expected across the Lake
until the high shifts eastward into the New England states by mid
week. Wednesday light to moderate southerly winds returns. A low
pressure system around 29.8 inches moves from the Northern Plains
toward the Hudson Bay and drags a warm front across Lake Michigan
Wednesday into Thursday. Isolated showers and storms will be
possible across the northern third of the lake. Winds remain
southerly through the end of the week.

LMZ261-362-364-366-563-565-567-868-040915-
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-
855 PM CDT Sun Aug 3 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...West winds 5 to 10 kt backing to east. Areas
of smoke overnight. Waves 1 ft or less.
.MONDAY...East winds 5 to 10 kt becoming northeast. Areas of
smoke. Waves 1 ft or less.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming southeast
5 to 10 kt. Areas of smoke. Waves 1 ft or less.
.TUESDAY...Southeast winds 10 to 15 kt becoming northeast 10 to
20 kt. Areas of smoke in the morning. Waves 1 to 2 ft.
.TUESDAY NIGHT...Northeast winds 10 to 20 kt becoming southeast
10 to 15 kt. Waves 1 to 2 ft.
.WEDNESDAY...Southeast winds 10 to 15 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...East winds 10 to 15 kt becoming south. Waves
1 to 2 ft.
.THURSDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-040915-
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-
855 PM CDT Sun Aug 3 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...North winds 10 to 15 kt becoming east. Areas
of smoke. Waves 1 to 2 ft.
.MONDAY...East winds 5 to 10 kt backing to north 10 to 15 kt.
Areas of smoke in the morning. Waves 1 to 2 ft.
.MONDAY NIGHT...Northeast winds 10 to 15 kt becoming east 5 to
10 kt. Areas of smoke overnight. Waves 1 to 2 ft.
.TUESDAY...East winds 10 to 15 kt becoming northeast 5 to 10 kt.
Waves 1 to 2 ft.
.TUESDAY NIGHT...Northeast winds 5 to 10 kt becoming east 10 to
15 kt. Waves 1 to 2 ft.
.WEDNESDAY...Southeast winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...East winds 5 to 10 kt becoming southeast.
Waves 1 to 2 ft.
.THURSDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ761-040915-
MAFOR 0404/
MICHIGAN NORTH 14200 11100 12110 11100. Waves 1 foot or less.

MICHIGAN SOUTH 11110 14200 12810 11100. Waves 1 foot or less.

$$


CMiller

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

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