699
FZUS63 KMKX 310803
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
303 AM CDT Sat Oct 31 2026

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 around 30.5 inches will continue to slide
southeastward through the eastern Great Lakes, becoming
stationary over the Northeast U.S. by tonight. Low pressure
around 29.9 inches over the central High Plains today will
strengthen to around 29.5 inches by Sunday evening, bringing
gradually increasing southeasterly winds through today, and again
Sunday night into Tuesday as low pressure ejects into the northern
Plains. Gusty south winds and Gales are likely Tuesday as low
pressure makes its closest approach through Minnesota and
continues to deepen. Isolated thunderstorms are also possible
Tuesday into Tuesday night. Southerly winds gradually diminish
through Wednesday, with a cold front Wednesday night bringing
westerly light winds to the Lake. West winds gradually shifting to
northwesterly are then expected through Thursday.

LMZ261-362-364-366-563-565-567-868-311515-
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-
303 AM CDT Sat Oct 31 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 20 kt. Waves 1 to 3 ft building to
3 to 5 ft.
.TONIGHT...South winds 10 to 15 kt. Slight chance of showers.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.SUNDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt. Waves 1 to 3 ft.
.MONDAY...South winds 10 to 20 kt increasing to 30 kt in the
afternoon. Waves 3 to 5 ft building to 5 to 8 ft occasionally to
10 ft.
.MONDAY NIGHT...Southeast winds to 30 kt becoming south. Showers.
Waves 7 to 10 ft occasionally to 13 ft building to 8 to 12 ft
occasionally to 16 ft.
.TUESDAY...South gales to 45 kt. Showers. Waves 10 to 14 ft
occasionally to 18 ft.
.WEDNESDAY...South winds 15 to 25 kt increasing to 30 kt. Chance
of showers. Waves 5 to 8 ft occasionally to 10 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-311515-
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-
303 AM CDT Sat Oct 31 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southeast winds 10 to 20 kt. Slight chance of showers.
Waves 3 to 5 ft.
.TONIGHT...Southeast winds 10 to 15 kt becoming south. Slight
chance of showers. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.SUNDAY...South winds 5 to 10 kt becoming southeast. Waves 1 to
3 ft.
.SUNDAY NIGHT...Southeast winds 10 to 15 kt becoming south 10 to
20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.MONDAY...South winds 10 to 20 kt increasing to 30 kt in the
afternoon. Waves 3 to 5 ft building to 5 to 8 ft occasionally to
10 ft.
.MONDAY NIGHT...Southeast winds to 30 kt becoming south. Chance
of showers. Waves 7 to 10 ft occasionally to 13 ft building to
8 to 11 ft occasionally to 14 ft.
.TUESDAY...South gales to 45 kt. Showers likely. Waves 10 to
14 ft occasionally to 18 ft.
.WEDNESDAY...South winds 15 to 25 kt increasing to 30 kt. Chance
of showers. Waves 5 to 8 ft occasionally to 10 ft.

$$

LMZ761-311515-
MAFOR 3110/
MICHIGAN NORTH 11410 13420 14410. Waves 2 feet or less building
to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1 to 3 feet
tonight.

MICHIGAN SOUTH 14320 12310 12410. Waves 1 to 3 feet building to 3
to 5 feet, then subsiding to 2 to 4 feet today. Waves 2 to 4 feet
subsiding to 1 to 3 feet tonight.

$$


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

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