792
FZUS63 KMKX 040805
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
305 AM CDT Sat Oct 4 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...

Lake Michigan remains sandwiched between a broad high pressure
around 30.4 inches lingering along the Mid-Atlantic coast and a
developing low pressure across the Central Plains through the
weekend. Southerly winds prevail across the lake and will increase
this afternoon. Expect to see even stronger winds into Sunday as
the low pressure deepens to around 29.4 inches as it lifts across
the Northern Plains into Ontario. Widespread southerly gusts of
20-30 knots are progged across the lake during this time, but
still could be a brief potential for gale force gusts to develop
across the northern third of the Lake Michigan later Sunday
evening. Given the brevity of the window for gales along with
slightly lower wind speeds, will continue to hold off on any gale
headlines at this time, but will continue to monitor. Then the
cold front extending off of the low pressure to the north is
progged to trek across the lake Monday bringing lighter, west to
northwesterly wind shift followed by high pressure settling in for
the middle of the week.

LMZ261-362-364-366-563-565-567-868-041530-
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-
305 AM CDT Sat Oct 4 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 20 kt increasing to 15 to 25 kt. Waves
2 to 4 ft building to 3 to 5 ft.
.TONIGHT...South winds to 30 kt diminishing to 15 to 25 kt. Waves
4 to 6 ft occasionally to 8 ft.
.SUNDAY...South winds 15 to 25 kt increasing to gales to 35 kt.
Waves 4 to 7 ft occasionally to 9 ft building to 8 to 11 ft
occasionally to 14 ft.
.SUNDAY NIGHT...South gales to 35 kt becoming southwest. Waves
8 to 11 ft occasionally to 14 ft.
.MONDAY...West winds 15 to 25 kt becoming north 10 to 20 kt.
Showers likely. Waves 5 to 8 ft occasionally to 10 ft subsiding
to 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...North winds 10 to 15 kt. Chance of showers. Waves
1 to 3 ft.
.TUESDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt becoming north. Waves
1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-041530-
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-
305 AM CDT Sat Oct 4 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southwest winds 10 to 15 kt becoming south 15 to 25 kt.
Waves 2 to 4 ft building to 3 to 5 ft.
.TONIGHT...South winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 3 to 5 ft.
.SUNDAY...South winds 10 to 20 kt increasing to 30 kt. Waves 3 to
5 ft building to 7 to 10 ft occasionally to 13 ft.
.SUNDAY NIGHT...South winds to 30 kt. Waves 7 to 10 ft
occasionally to 13 ft subsiding to 6 to 9 ft occasionally to
12 ft.
.MONDAY...Southwest winds 15 to 25 kt becoming west 10 to 20 kt.
Chance of showers. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 6 ft occasionally to 8 ft.
.MONDAY NIGHT...North winds 10 to 15 kt becoming northwest 10 to
20 kt. Showers. Waves 2 to 4 ft.
.TUESDAY...North winds 10 to 20 kt. Chance of showers. Waves 4 to
6 ft occasionally to 8 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.

$$

LMZ761-041530-
MAFOR 0410/
MICHIGAN NORTH 11410 12420 14430 11430. Waves 1 to 3 feet
building to 2 to 4 feet today. Waves 3 to 5 feet tonight.

MICHIGAN SOUTH 11510 11410 11420 14430 11420. Waves 1 to 3 feet
building to 2 to 4 feet today. Waves 3 to 5 feet tonight.

$$


Wagner

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

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