868
FZUS63 KMKX 180854
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
254 AM CST Tue Nov 18 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 29.7 inches over northwestern Missouri will
continue to move east early this morning. East winds will slowly
increase through this morning. The breezy winds will become northeasterly
over the southern half of the lake as the low moves into the Ohio
River Valley this evening. Winds then ease Wednesday as high
pressure of 30.3 inches moves over the lake. High pressure exits
into Thursday morning, with winds becoming southwesterly as a low
pressure system progresses eastward across northern Ontario. A
cold front from that low pressure system will shift winds to
northwesterly overnight Thursday into Friday.

LMZ261-362-364-366-563-565-567-868-181645-
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-
254 AM CST Tue Nov 18 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northeast winds 10 to 15 kt. Chance of rain this
morning, then slight chance of rain this afternoon. Waves 1 to
3 ft.
.TONIGHT...Northeast winds 5 to 10 kt becoming north. Waves 1 to
2 ft.
.WEDNESDAY...Southwest winds 5 to 10 kt increasing to 10 to
15 kt. Waves 1 ft or less.
.WEDNESDAY NIGHT...South winds 10 to 15 kt becoming southwest.
Waves 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Chance of rain in the
morning, then rain likely in the afternoon. Waves 2 to 4 ft.
.THURSDAY NIGHT...West winds 15 to 25 kt becoming northwest 10 to
20 kt. Waves 2 to 4 ft.
.FRIDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.SATURDAY...West winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-181645-
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-
254 AM CST Tue Nov 18 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...East winds 10 to 20 kt. Rain and slight chance of snow
this morning, then chance of rain this afternoon. Waves 2 to 4 ft
building to 4 to 6 ft occasionally to 8 ft.
.TONIGHT...East winds 10 to 20 kt diminishing to 10 to 15 kt.
Slight chance of rain in the evening. Waves 3 to 5 ft subsiding
to 2 to 4 ft.
.WEDNESDAY...East winds 10 to 15 kt becoming southeast 5 to
10 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.WEDNESDAY NIGHT...South winds 5 to 10 kt becoming southwest.
Waves 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Chance of rain in the
afternoon. Waves 2 to 4 ft.
.THURSDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Waves 2 to 4 ft building to 3 to 5 ft.
.FRIDAY...Northwest winds 10 to 20 kt becoming north. Waves 4 to
6 ft occasionally to 8 ft.
.SATURDAY...Northeast winds 10 to 15 kt veering to southwest
10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ761-181645-
MAFOR 1811/
MICHIGAN NORTH 11110 12210 11110 12100 12800. A chance of rain
this morning. Waves 2 feet or less.

MICHIGAN SOUTH 11226 12227 12220 11120 12110. Waves 2 feet or
less building to 3 to 5 feet today. Waves 2 to 4 feet subsiding
to 1 to 3 feet tonight.

$$


Patterson

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

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