347
FZUS63 KMKX 130757
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
257 AM CDT Mon Oct 13 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...

A weakening surface trough extending from low pressure around
29.3 inches moving from southern Manitoba to northwest Ontario
will slide across Lake Michigan today. Southerly winds will ease
today and become northerly and breezy in the wake of a cold front
Tuesday morning into Wednesday. High pressure around 30.3 inches
then settles over the region later Wednesday into Thursday. Breezy
southerly winds are expected Friday as low pressure approaches
from the Northern Plains.

LMZ261-362-364-366-563-565-567-868-131515-
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-
257 AM CDT Mon Oct 13 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 15 to 25 kt becoming southwest 10 to 20 kt.
Isolated showers this morning, then chance of showers this
afternoon. Waves 3 to 5 ft.
.TONIGHT...West winds 5 to 10 kt becoming northwest 10 to 15 kt
late in the evening, then becoming north 10 to 20 kt overnight.
Waves 2 to 4 ft building to 3 to 5 ft.
.TUESDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt. Chance of rain showers.
Waves 3 to 5 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt becoming north. Waves
2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming east.
Waves 1 to 2 ft.
.THURSDAY...Southeast winds 10 to 15 kt becoming south 10 to
20 kt. Waves 1 to 3 ft building to 3 to 5 ft.
.FRIDAY...South winds to 30 kt. Chance of showers. Waves 8 to
11 ft occasionally to 14 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-131515-
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-
257 AM CDT Mon Oct 13 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 10 to 20 kt becoming southwest 10 to 15 kt.
Slight chance of showers. Waves 2 to 4 ft.
.TONIGHT...Northwest winds 5 to 10 kt becoming north late in the
evening, then increasing to 10 to 20 kt after midnight. Waves 1
to 3 ft building to 3 to 5 ft.
.TUESDAY...Northeast winds 10 to 20 kt becoming north. Waves 4 to
6 ft occasionally to 8 ft.
.TUESDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to
20 kt. Chance of showers. Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming east.
Waves 1 to 3 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Waves 3 to 5 ft.
.FRIDAY...South winds to 30 kt. Waves 8 to 11 ft occasionally to
14 ft.

$$

LMZ761-131515-
MAFOR 1310/
MICHIGAN NORTH 11430 12420 11520 11510 11700 11810 11820. A
chance of showers today. Waves 2 to 4 feet subsiding to 1 to 3
feet today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

MICHIGAN SOUTH 13420 11410 11600 11800 11810 11820. Waves 2 to 4
feet subsiding to 1 to 3 feet today. Waves 2 feet or less
building to 2 to 4 feet tonight.

$$


Cronce

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

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