369
FZUS63 KMKX 261947
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
247 PM CDT Sat Apr 26 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...

High pressure around 30.4 inches over Lake Superior and Wisconsin
will move over Lake Michigan this evening. The high will be slow
to move away with light and variable winds forecast tonight and
Sunday.

Low pressure of 29.4 inches will then track from South Dakota
to northeast Minnesota Monday, then to Quebec by mid Tuesday
morning. Expect breezy southerly winds over Lake Michigan Monday
through Monday night. Southerly gales are possible, although there
will be a strong inversion over the cooler open waters, so there
is uncertainty that the very strong winds up to 50 kt just off the
surface will be able to mix down. The associated cold front will
cross Lake Michigan on Tuesday. Winds will diminish quickly
Tuesday night as high pressure around 30.2 inches moves into the
region.

LMZ261-362-364-366-563-565-567-868-270330-
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-
247 PM CDT Sat Apr 26 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...North winds 10 to 20 kt becoming northeast less than
10 kt. Waves 2 to 4 ft subsiding to 1 ft or less.
.SUNDAY...South winds less than 10 kt increasing to 5 to 10 kt
late in the morning, then becoming southwest early in the
afternoon becoming south late. Waves 1 ft or less.
.SUNDAY NIGHT...South winds 5 to 10 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft building to 2 to 4 ft.
.MONDAY...South winds to 30 kt. Chance of rain showers. Waves
4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally
to 12 ft.
.MONDAY NIGHT...South gales to 30 kt. Showers with a chance of
thunderstorms in the evening, then showers likely with a chance of
thunderstorms overnight. Waves 6 to 9 ft occasionally to 12 ft.
.TUESDAY...Southwest winds to 30 kt becoming northwest. Chance of
rain showers and thunderstorms in the morning, then chance of
rain showers in the afternoon. Waves 6 to 9 ft occasionally to
12 ft.
.TUESDAY NIGHT...North winds to 30 kt diminishing to 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt. Waves 1 to 3 ft.
.THURSDAY...Southeast winds 10 to 15 kt becoming northeast.
Chance of rain showers. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-270330-
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-
247 PM CDT Sat Apr 26 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...North winds 15 to 25 kt diminishing to 10 to 20 kt
late this evening, then becoming northeast 10 to 15 kt after
midnight diminishing to 5 to 10 kt late. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft.
.SUNDAY...East winds 5 to 10 kt increasing to 10 to 15 kt. Waves
1 to 2 ft.
.SUNDAY NIGHT...East winds 10 to 15 kt becoming south 10 to
20 kt. Waves 2 to 4 ft.
.MONDAY...South winds 15 to 25 kt increasing to 30 kt. Waves 4 to
7 ft occasionally to 9 ft building to 6 to 9 ft occasionally to
12 ft.
.MONDAY NIGHT...South winds to 30 kt becoming southwest. Chance
of showers and thunderstorms in the evening, then showers likely
with a chance of thunderstorms overnight. Waves 6 to 9 ft
occasionally to 12 ft.
.TUESDAY...Southwest winds to 30 kt becoming west 15 to 25 kt.
Chance of thunderstorms in the morning, then chance of showers in
the afternoon. Waves 6 to 9 ft occasionally to 12 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt. Waves 2 to 4 ft.
.THURSDAY...East winds 10 to 15 kt becoming northeast. Chance of
rain showers. Waves 2 to 4 ft.

$$

LMZ761-270330-
MAFOR 2622/
MICHIGAN NORTH 11820 11810 11800 11100 11300 11400 11500 11410.
Waves 2 to 4 feet subsiding to 1 foot or less tonight. Waves 1
foot or less Sunday.

MICHIGAN SOUTH 11830 11820 11810 11100 11200 12300 11310. Waves 3
to 6 feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less
Sunday.

$$


Gehring

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

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