Great Lakes Forecast
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446
FZUS63 KMKX 140158
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
858 PM CDT Mon Oct 13 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...

A dry cold front will cross the lake in a north to south manner
later overnight, with light and variable winds ahead of the front
shifting northerly and becoming breezy.

Breezy north to northeast winds will continue Tuesday
through Tuesday night as 30.4 inch high pressure builds into the
northern Great Plains. The high will cross Lake Michigan on
Wednesday, allowing winds to taper across the waters. Winds will
turn out of the south to southeast on Thursday, when 29.5 inch low
pressure is forecast to develop over the northern Great Plains.
The low will deepen to near 29.3 inches near Lake Winnipeg
Thursday night through Friday, allowing winds to increase further
across Lake Michigan. Gusts could approach gale force during this
time frame, with trends being monitored through the coming
forecasts. Winds will remain breezy as they turn out of the
southwest on Saturday. Winds will increase again as they turn out
of the northwest on Sunday behind a cold front. Additional gales
will be possible as this occurs.

Periods of showers will accompany the series of low pressure &
frontal passages through this weekend. Peak periods of shower
potential will be through this evening, Tuesday night, and Thursday
through Saturday. A few rumbles of thunder could accompany showers,
though severe weather is not anticipated at this time.

LMZ261-362-364-366-563-565-567-868-140915-
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-
858 PM CDT Mon Oct 13 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...West winds 5 to 10 kt becoming northwest 10 to
15 kt late this evening, then becoming north 10 to 20 kt
overnight. Waves 2 to 4 ft.
.TUESDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt becoming northeast.
Chance of rain showers. Waves 3 to 5 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt becoming north. Waves
2 to 4 ft subsiding to 1 to 2 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming east.
Waves 1 to 2 ft.
.THURSDAY...Southeast winds 10 to 15 kt becoming south 10 to
20 kt. Waves 1 to 3 ft building to 3 to 5 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt increasing to 15 to
25 kt. Showers likely. Waves 3 to 5 ft building to 5 to 8 ft
occasionally to 10 ft.
.FRIDAY...South winds to 30 kt. Chance of showers. Waves 8 to
11 ft occasionally to 14 ft.
.SATURDAY...Southwest winds 10 to 20 kt increasing to 15 to
25 kt. Showers likely. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-140915-
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-
858 PM CDT Mon Oct 13 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...North winds 5 to 10 kt increasing to 10 to
20 kt. Waves 1 to 3 ft building to 2 to 4 ft.
.TUESDAY...Northeast winds 10 to 20 kt becoming north. Waves 3 to
5 ft.
.TUESDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to
20 kt. Chance of showers. Waves 4 to 7 ft occasionally to 9 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.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming east.
Waves 1 to 3 ft.
.THURSDAY...Southeast winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 3 ft building to 3 to 5 ft.
.THURSDAY NIGHT...Southeast winds 10 to 20 kt becoming south
15 to 25 kt. Chance of showers. Waves 3 to 5 ft building to 5 to
8 ft occasionally to 10 ft.
.FRIDAY...South winds to 30 kt. Waves 8 to 11 ft occasionally to
14 ft.
.SATURDAY...Southwest winds 15 to 25 kt. Showers likely. Waves
5 to 8 ft occasionally to 10 ft.

$$

LMZ761-140915-
MAFOR 1404/
MICHIGAN NORTH 16820. A chance of showers Tuesday evening. Waves
1 to 3 feet overnight. Waves 2 to 4 feet Tuesday and Tuesday
evening.

MICHIGAN SOUTH 11810 11820 12120 12820 11830 11130. A chance of
showers Tuesday evening. Waves 1 to 3 feet overnight. Waves 2 to
4 feet building to 3 to 5 feet Tuesday. Waves 3 to 6 feet Tuesday
evening.

$$


Sheppard

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

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