426
FZUS63 KMKX 121935
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
235 PM CDT Sat Jul 12 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...

Low pressure of 29.5 inches will continue to lift northward across
Ontario and into the James Bay region tonight. A weak cold front
will cross the lake this evening, with winds gradually turning
more westerly as the front progresses eastward. High pressure of
29.9 inches will move across the southern portion of the lake on
Sunday.

Southerly flow then returns to the lake on Monday, continuing
through at least Tuesday.

LMZ261-362-364-366-563-565-567-868-130330-
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-
235 PM CDT Sat Jul 12 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds 10 to 20 kt becoming west 10 to 15 kt.
Slight chance of showers and thunderstorms this evening. Patchy
dense fog overnight. Waves 1 to 3 ft.
.SUNDAY...West winds 10 to 15 kt becoming southwest 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...Southwest winds 10 to 20 kt. Areas of smoke
overnight. Waves 2 to 4 ft.
.MONDAY...Southwest winds 10 to 20 kt. Waves 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 20 kt diminishing to 5 to 10 kt
overnight. Waves 1 to 3 ft.
.TUESDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 20 kt becoming south 10 to
15 kt. Chance of showers and thunderstorms. Waves 1 to 3 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt. Chance of showers.
Waves 2 to 4 ft.
.THURSDAY...Northeast winds 10 to 20 kt becoming north 15 to
25 kt. Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-130330-
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-
235 PM CDT Sat Jul 12 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southwest winds 10 to 20 kt becoming west 10 to 15 kt.
Slight chance of showers this evening. Waves 1 to 3 ft.
.SUNDAY...West winds 10 to 15 kt backing to south. Waves 1 to
2 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt becoming southwest. Areas
of smoke. Waves 1 to 2 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming south. Areas of
smoke in the morning. Waves 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 to 3 ft.
.TUESDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.TUESDAY NIGHT...South winds 10 to 15 kt. Chance of showers.
Waves 1 to 3 ft.
.WEDNESDAY...Southwest winds 10 to 20 kt veering to west. Chance
of showers. Waves 2 to 4 ft.
.THURSDAY...West winds 10 to 20 kt veering to north. Chance of
showers. Waves 3 to 5 ft.

$$

LMZ761-130330-
MAFOR 1222/
MICHIGAN NORTH 12520 11610 11610 19614 12610 12520. A chance of
showers early this evening. Waves 1 to 3 feet tonight. Waves 2
feet or less Sunday.

MICHIGAN SOUTH 11520 14610 12600 11500. Waves 1 to 3 feet
tonight. Waves 2 feet or less Sunday.

$$


Boxell

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

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