560
FZUS63 KMKX 152051
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
251 PM CST Mon Dec 15 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...

Southwest wind will continue to diminish this evening into tonight
as a weak low of 29.9 inches over Lake Superior moves northeast.
Light south to southwest winds are expected through Tuesday
morning before increasing ahead of an approaching strong low
pressure around 29.0 inches. This low will move east across Canada
from central Saskatchewan into northern Ontario Tuesday afternoon
through Tuesday night. Southwest winds will increase across the
lake with gales likely across the northern third as the low passes
to the north. A Gale Warning is in effect for the northern third
during this time.

A cold front will cross the lake Tuesday night with winds veering to
westerly behind the front. West to northwest winds will be short
lived and will diminish behind the front Tuesday night. Another
strong low pressure system is expected to track eastward along the
Canadian border Wednesday into Thursday. Winds will turn southerly
and remain light Wednesday morning before increasing. Strong
southerly wind will develop ahead of the low Wednesday night. Strong
winds will veer Thursday morning as another cold front crosses the
lake and becomes west-northwesterly. Southerly Gales Wednesday night
and west-northwest gales Thursday afternoon through Thursday night
are likely.

LMZ261-362-364-563-160415-
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 Rock Island Passage to Sturgeon Bay WI-
251 PM CST Mon Dec 15 2025

STURGEON BAY WI TO POINT BETSIE MI NORTH...

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH LATE
TUESDAY NIGHT...

.TONIGHT...West winds 10 to 15 kt becoming southwest 10 to 20 kt.
Waves 3 to 5 ft subsiding to 1 to 3 ft.
.TUESDAY...Southwest winds to 30 kt increasing to gales to 40 kt.
Slight chance of light freezing rain in the morning, then slight
chance of rain showers in the afternoon. Waves 3 to 5 ft building
to 10 to 14 ft occasionally to 18 ft.
.TUESDAY NIGHT...Southwest gales to 40 kt becoming west gales to
35 kt. Waves 10 to 14 ft occasionally to 18 ft subsiding to 6 to
9 ft occasionally to 12 ft.
.WEDNESDAY...Northwest winds to 30 kt becoming southwest 10 to
20 kt in the afternoon. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 2 to 4 ft.
.WEDNESDAY NIGHT...South gales to 40 kt increasing to gales to
45 kt. Waves 8 to 12 ft occasionally to 16 ft building to 14 to
18 ft occasionally to 23 ft.
.THURSDAY...South gales to 40 kt becoming west gales to 35 kt.
Rain showers. Waves 14 to 18 ft occasionally to 23 ft subsiding
to 10 to 14 ft occasionally to 18 ft.
.THURSDAY NIGHT...Northwest gales to 40 kt. Freezing spray.
Chance of snow. Waves 10 to 14 ft occasionally to 18 ft.
.FRIDAY...North winds to 30 kt becoming northwest 10 to 20 kt.
Waves 6 to 9 ft occasionally to 12 ft subsiding to 2 to 4 ft.
.SATURDAY...Southwest winds to 30 kt becoming west. Waves 12 to
16 ft occasionally to 21 ft subsiding to 8 to 11 ft occasionally
to 14 ft.

$$

LMZ366-565-567-868-160415-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
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-
251 PM CST Mon Dec 15 2025

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO SHEBOYGAN WI TO
PENTWATER MI...

.TONIGHT...West winds 10 to 15 kt becoming southwest 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 1 to 3 ft.
.TUESDAY...Southwest winds 15 to 25 kt increasing to gales to
35 kt. Waves 3 to 5 ft building to 10 to 14 ft occasionally to
18 ft.
.TUESDAY NIGHT...Southwest winds to 30 kt becoming west after
midnight, then diminishing to 15 to 25 kt late. Waves 10 to 14 ft
occasionally to 18 ft subsiding to 6 to 9 ft occasionally to
12 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 2 to
4 ft.
.WEDNESDAY NIGHT...South gales to 40 kt. Chance of rain showers
overnight. Waves 8 to 12 ft occasionally to 16 ft building to
14 to 18 ft occasionally to 23 ft.
.THURSDAY...South gales to 40 kt becoming west. Rain showers in
the morning, then rain showers likely in the afternoon. Waves
14 to 18 ft occasionally to 23 ft.
.THURSDAY NIGHT...Northwest gales to 40 kt diminishing to gales
to 35 kt. Freezing spray. Chance of snow. Waves 14 to 18 ft
occasionally to 23 ft.
.FRIDAY...Northwest winds to 30 kt becoming west 10 to 20 kt.
Waves 8 to 12 ft occasionally to 16 ft subsiding to 4 to 6 ft
occasionally to 8 ft.
.SATURDAY...Southwest winds to 30 kt diminishing to 15 to 25 kt.
Waves 12 to 16 ft occasionally to 21 ft subsiding to 8 to 12 ft
occasionally to 16 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-160415-
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-
251 PM CST Mon Dec 15 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...West winds 10 to 20 kt diminishing to 10 to 15 kt late
this evening, then becoming southwest 5 to 10 kt after midnight
increasing to 10 to 15 kt late. Waves 4 to 7 ft occasionally to
9 ft subsiding to 2 to 4 ft.
.TUESDAY...South winds 10 to 20 kt becoming southwest to 30 kt.
Waves 3 to 5 ft building to 8 to 11 ft occasionally to 14 ft.
.TUESDAY NIGHT...Southwest gales to 35 kt becoming west to 30 kt.
Waves 10 to 14 ft occasionally to 18 ft subsiding to 7 to 10 ft
occasionally to 13 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to
6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...South gales to 35 kt increasing to gales to
40 kt. Chance of rain showers overnight. Waves 8 to 12 ft
occasionally to 16 ft building to 12 to 16 ft occasionally to
21 ft.
.THURSDAY...South gales to 35 kt becoming west gales to 40 kt.
Rain showers in the morning, then rain showers likely in the
afternoon. Waves 14 to 18 ft occasionally to 23 ft.
.THURSDAY NIGHT...West gales to 40 kt becoming northwest.
Freezing spray. Chance of snow and rain. Waves 15 to 20 ft
occasionally to 26 ft.
.FRIDAY...Northwest winds to 30 kt becoming west 10 to 20 kt.
Waves 12 to 16 ft occasionally to 21 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.SATURDAY...Southwest winds to 30 kt. Waves 12 to 16 ft
occasionally to 21 ft.

$$

LMZ761-160415-
MAFOR 1523/
MICHIGAN NORTH...GALE WARNING IN EFFECT...12610 11600 11510 11530
11540 12550. Waves 3 to 6 feet subsiding to 1 to 3 feet tonight.
Waves 3 to 5 feet building to 9 to 13 feet Tuesday.

MICHIGAN SOUTH 11620 11610 11600 11510 11420 11530 12540. Waves 4
to 7 feet subsiding to 1 to 3 feet tonight. Waves 2 to 4 feet
building to 7 to 10 feet Tuesday.

$$


Patterson

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

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