765
FZUS63 KMKX 040801
GLFLM

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

Low pressure around 29.8 inches just north of Lake Superior will
deepen to 29.4 inches as it approaches James Bay late this
afternoon. A cold front will sweep across Lake Michigan Sunday
morning turning the breezy southwest winds to northwesterly by mid
morning. Breezy northwest winds will be at there strongest across
far northern Lake Michigan and remain just below gale force. There
will be a potential for waterspouts across the far northern edge
of the lake this evening into tonight behind the cold front. Lessening
northwest winds will continue through the day Monday, tapering
Monday night as 30.2 inch high pressure moves in from the Upper
Mississippi River Valley.

A deeper area of 29.4 inch low pressure will build toward the
Hudson Bay Tuesday through Thursday. South-southwest winds will
increase in advance of the approaching low Tuesday afternoon
through Wednesday, becoming gusty at times. A few gusts could
approach gale-force, particularly over the northern half of the
open waters. Will be monitoring for possible headlines as this
portion of the period draws closer. The low will pull a cold front
across the waters Wednesday night into Thursday, bringing a west-
northwest wind shift and scattered rain showers.

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-
301 AM CDT Sun Oct 4 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...West winds to 30 kt becoming northwest. Waves 6 to 9 ft
occasionally to 12 ft subsiding to 3 to 5 ft.
.TONIGHT...Northwest winds to 30 kt diminishing to 15 to 25 kt.
Slight chance of waterspouts. Waves 4 to 6 ft occasionally to
8 ft.
.MONDAY...Northwest winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 3 to 5 ft subsiding to 2 to 4 ft.
.MONDAY NIGHT...Southwest winds 10 to 15 kt becoming south 10 to
20 kt. Waves 1 to 3 ft.
.TUESDAY...South winds to 30 kt increasing to gales to 40 kt in
the afternoon. Waves 5 to 8 ft occasionally to 10 ft building to
8 to 11 ft occasionally to 14 ft.
.TUESDAY NIGHT...Southwest gales to 35 kt becoming west. Waves
8 to 11 ft occasionally to 14 ft subsiding to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...West winds 15 to 25 kt increasing to 30 kt. Waves
3 to 5 ft subsiding to 2 to 4 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west 15 to
25 kt. 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-
301 AM CDT Sun Oct 4 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southwest winds 15 to 25 kt veering to northwest 10 to
20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to
6 ft occasionally to 8 ft.
.TONIGHT...Northwest winds 10 to 20 kt becoming north. Waves 4 to
6 ft occasionally to 8 ft.
.MONDAY...North 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.
.MONDAY NIGHT...East winds 5 to 10 kt becoming south 10 to 20 kt
overnight. Waves 1 to 3 ft.
.TUESDAY...South winds to 30 kt increasing to gales to 35 kt.
Waves 5 to 8 ft occasionally to 10 ft building to 8 to 11 ft
occasionally to 14 ft.
.TUESDAY NIGHT...Southwest winds to 30 kt becoming west. Waves
7 to 10 ft occasionally to 13 ft subsiding to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west. Waves 2 to
4 ft.

$$

LMZ761-041530-
MAFOR 0410/
MICHIGAN NORTH 12640 13730 12740 11730. A chance of showers early
this morning. Waves 6 to 9 feet subsiding to 2 to 4 feet today.
Waves 2 to 4 feet building to 3 to 6 feet tonight.

MICHIGAN SOUTH 11530 11630 14720 11720 11820. Waves 4 to 7 feet
subsiding to 3 to 6 feet today. Waves 2 to 4 feet building to 3
to 5 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