528
FZUS63 KMKX 131332
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
832 AM 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...

29.4 inch low pressure is moving into the Hudson Bay this
morning, resulting in generally east to southeast winds across
the open waters of Lake Michigan. Said low will drag a cold front
across the lake this evening, resulting in a breezy northerly wind
shift. 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.

LMZ261-362-364-366-563-565-567-868-132130-
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-
832 AM CDT Mon Oct 13 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds 10 to 20 kt becoming southwest.
Scattered showers through mid morning, then chance of showers
this afternoon. Waves 3 to 5 ft.
.TONIGHT...West winds 5 to 10 kt becoming northwest 10 to 15 kt
late in the evening, then becoming north 10 to 20 kt overnight.
Waves 2 to 4 ft building to 3 to 5 ft.
.TUESDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt. 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 3 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.
.FRIDAY...South winds to 30 kt. Chance of showers. Waves 8 to
11 ft occasionally to 14 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-132130-
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-
832 AM CDT Mon Oct 13 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Scattered showers through mid morning, then isolated
showers this afternoon. Waves 2 to 4 ft.
.TONIGHT...Northwest winds 5 to 10 kt becoming north late in the
evening, then increasing to 10 to 20 kt after midnight becoming
north 10 to 20 kt late. Waves 1 to 3 ft building to 3 to 5 ft.
.TUESDAY...Northeast winds 10 to 20 kt becoming north. Waves 4 to
6 ft occasionally to 8 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 20 kt. Waves 3 to 5 ft.
.FRIDAY...South winds to 30 kt. Waves 8 to 11 ft occasionally to
14 ft.

$$

LMZ761-132130-
MAFOR 1316/
MICHIGAN NORTH 11420 19426 11520 11510 11700 11810 13820. Waves 2
to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 1 to 3
feet building to 2 to 4 feet tonight. Waves 3 to 5 feet Tuesday
morning.

MICHIGAN SOUTH 11420 11410 11600 11800 11810 12820 11120. Waves 2
to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 2 feet
or less building to 2 to 4 feet tonight. Waves 3 to 6 feet
Tuesday morning.

$$


Quigley

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

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