629
FZUS63 KMKX 020259
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
859 PM CST Mon Dec 1 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...

Light southerly winds will become west to southwest late tonight
into Tuesday as an area of high pressure of 30.2 inches moves
through the Ohio Valley.

A strong cold front along a low pressure trough averaging 29.8
inches will cross Lake Michigan Wednesday. Gusty southwest winds
are expected ahead of this front early Wednesday morning, with
gusty northwest winds behind it Wednesday afternoon and night.
Winds are expected to remain just below gale force, although a few
gale force gusts look possible. Very cold air with this system
will result in a risk for freezing spray Wednesday night and
Thursday.

Light winds are expected Thursday with the influence of high
pressure of 30.4 inches over Illinois and Indiana. Another period
of elevated southwest winds will occur Thursday night into Friday
as another low pressure trough around 29.8 inches crosses the
Upper Great Lakes.

LMZ261-362-364-366-563-565-567-868-021015-
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-
859 PM CST Mon Dec 1 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Southwest winds 10 to 20 kt becoming northwest
10 to 15 kt. Snow showers through early evening, then chance of
snow overnight. Waves 3 to 5 ft.
.TUESDAY...West winds 10 to 15 kt becoming southwest 10 to 20 kt
early in the afternoon, then increasing to 15 to 25 kt late.
Waves 3 to 5 ft.
.TUESDAY NIGHT...Southwest winds to 30 kt increasing to gales to
35 kt. Chance of snow overnight. Waves 4 to 6 ft occasionally to
8 ft building to 8 to 11 ft occasionally to 14 ft.
.WEDNESDAY...West winds to 30 kt becoming northwest. Snow in the
morning, then chance of snow in the afternoon. Waves 8 to 11 ft
occasionally to 14 ft subsiding to 6 to 9 ft occasionally to
12 ft.
.WEDNESDAY NIGHT...Northwest gales to 35 kt. Chance of snow.
Freezing spray overnight. Waves 7 to 10 ft occasionally to 13 ft.
.THURSDAY...Northwest winds to 30 kt becoming west 15 to 25 kt.
Chance of snow in the morning. Waves 6 to 9 ft occasionally to
12 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.THURSDAY NIGHT...Southwest gales to 40 kt increasing to gales to
45 kt. Chance of snow. Waves 6 to 9 ft occasionally to 12 ft
building to 8 to 12 ft occasionally to 16 ft.
.FRIDAY...Southwest gales to 40 kt diminishing to gales to 35 kt.
Chance of snow. Waves 10 to 14 ft occasionally to 18 ft.
.SATURDAY...Northwest winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-021015-
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-
859 PM CST Mon Dec 1 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 10 to 20 kt veering to northwest.
Snow showers through early evening, then chance of snow
overnight. Waves 3 to 5 ft.
.TUESDAY...Northwest winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 20 kt increasing to gales
to 35 kt. Chance of snow overnight. Waves 3 to 5 ft building to
8 to 12 ft occasionally to 16 ft.
.WEDNESDAY...Southwest gales to 35 kt becoming west to 30 kt.
Snow likely. Waves 10 to 14 ft occasionally to 18 ft.
.WEDNESDAY NIGHT...Northwest winds to 30 kt. Chance of snow in
the evening. Freezing spray overnight. Waves 8 to 12 ft
occasionally to 16 ft.
.THURSDAY...Northwest winds to 30 kt becoming west 10 to 20 kt in
the afternoon. Waves 8 to 12 ft occasionally to 16 ft subsiding
to 5 to 8 ft occasionally to 10 ft.
.THURSDAY NIGHT...Southwest winds 15 to 25 kt increasing to
30 kt. Waves 4 to 7 ft occasionally to 9 ft building to 8 to
11 ft occasionally to 14 ft.
.FRIDAY...Southwest winds to 30 kt increasing to gales to 35 kt.
Waves 10 to 14 ft occasionally to 18 ft.
.SATURDAY...West winds 10 to 20 kt. Waves 4 to 7 ft occasionally
to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.

$$

LMZ761-021015-
MAFOR 0205/
MICHIGAN NORTH 11620 13610 12520 12540. A chance of snow
overnight. Waves 1 to 3 feet building to 2 to 4 feet overnight
and Tuesday. Waves 3 to 6 feet Tuesday evening.

MICHIGAN SOUTH 11520 11620 12710 12610 11520 11530. A chance of
snow overnight and Tuesday evening. Waves 3 to 5 feet subsiding
to 2 to 4 feet overnight. Waves 1 to 3 feet Tuesday. Waves 3 to 6
feet Tuesday evening.

$$


Patterson

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

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