219
FZUS63 KMKX 311937
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
237 PM CDT Thu Jul 31 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...

Breezy north to northeast winds will persist across Lake Michigan
through Friday as high pressure around 30.3 inches moves into the
western Great Lakes from the Northern Plains. This area of high
pressure will slowly move eastward and be overhead Saturday. Winds
will light and variable across the lake much of the day Saturday
before becoming light south to southeasterly Sunday afternoon as the
high pushes into the New England States. Low pressure around
29.9 inches will gradually approach from the Northern Plains on
Monday and Tuesday, so look for increasing southerly winds and
a chance for thunderstorms.

LMZ261-362-364-366-563-565-567-868-010315-
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-
237 PM CDT Thu Jul 31 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...North winds to 15 to 25 kt becoming northeast 10 to 15
kt. Patchy smoke. Waves 5 to 8 ft occasionally to 10 ft subsiding
to 2 to 4 ft.
.FRIDAY...North winds 10 to 15 kt becoming northwest 10 to 20 kt.
Patchy smoke. Waves 2 to 4 ft.
.FRIDAY NIGHT...Southwest winds 10 to 20 kt becoming west 5 to
10 kt. Patchy smoke in the evening. Waves 1 to 3 ft subsiding to
1 to 2 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 2 ft.
.SATURDAY NIGHT...Southwest winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 2 ft.
.SUNDAY...West winds 10 to 15 kt becoming southwest. Waves 1 to
2 ft.
.SUNDAY NIGHT...Southwest winds 10 to 15 kt becoming south. Waves
1 ft or less.
.MONDAY...South winds 5 to 10 kt increasing to 10 to 15 kt. Waves
1 ft or less.
.TUESDAY...East winds 5 to 10 kt becoming southeast 10 to 15 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-010315-
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-
237 PM CDT Thu Jul 31 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...North winds 15 to 25 kt becoming northeast late this
evening, then becoming east 10 to 20 kt overnight. Areas of smoke.
Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to 7 ft
occasionally to 9 ft.
.FRIDAY...Northeast winds 10 to 20 kt becoming north. Areas of
smoke. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to
15 kt late in the evening, then diminishing to 5 to 10 kt after
midnight becoming east late. Patchy smoke in the evening. Waves
2 to 4 ft subsiding to 1 to 3 ft.
.SATURDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Waves 1 to 2 ft.
.SATURDAY NIGHT...Northeast winds 5 to 10 kt veering to
southeast. Waves 1 ft or less.
.SUNDAY...Southeast winds 5 to 10 kt. Waves nearly calm.
.SUNDAY NIGHT...Northeast winds 5 to 10 kt becoming southeast.
Waves 1 ft or less.
.MONDAY...Southeast winds 5 to 10 kt becoming east. Waves 1 to
2 ft.
.TUESDAY...Southeast winds 10 to 15 kt becoming east. Waves 1 to
2 ft.

$$

LMZ761-010315-
MAFOR 3122/
MICHIGAN NORTH 11830 11130 11120 11110 12810 11820 11720. Waves 4
to 7 feet subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet
Friday.

MICHIGAN SOUTH 11830 11130 11120 11220 12110 12820. Waves 5 to 8
feet subsiding to 3 to 6 feet tonight. Waves 3 to 5 feet
subsiding to 2 to 4 feet Friday.

$$


Cronce

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

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