121
FZUS63 KMKX 181959
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
259 PM CDT Fri Apr 18 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...

Breezy southerly winds persist as low pressure around 29.5 inches
continues northeastward into WI then central portions of the Lake
by this evening. A cold front will extend southwest from the low
crossing the southern half of lake later this evening. The modest
south winds will veer northwest through this evening (beginning
with the northern lake, then the southern half as the front
passes). There are additional chances for thunderstorms along with
some hail and strong winds across southern half of the Lake later
today into tonight with the cold front.

Modest northwest winds continue behind the cold front overnight
followed by lighter north winds Saturday, as high pressure around
30.4 inches builds into the Great lakes region. This area of high
pressure is expected to cross Superior and Upper Peninsula of
Michigan Saturday night. Winds will be light and variable across
the lake Saturday evening into Sunday morning. East to northeast
winds are expected Sunday.

LMZ261-362-364-366-563-565-567-868-190315-
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-
259 PM CDT Fri Apr 18 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...North winds 10 to 20 kt becoming northwest 15 to
25 kt. Chance of rain showers and thunderstorms this evening,
then chance of rain showers overnight. Waves 3 to 5 ft.
.SATURDAY...Northwest winds 10 to 20 kt becoming north. Waves
2 to 4 ft.
.SATURDAY NIGHT...Northeast winds 10 to 20 kt diminishing to
10 to 15 kt. Waves 1 to 3 ft.
.SUNDAY...East winds 10 to 15 kt becoming northeast 10 to 20 kt.
Waves 1 to 2 ft.
.SUNDAY NIGHT...East winds 10 to 20 kt increasing to 30 kt
overnight. Chance of rain showers in the evening, then rain
showers overnight. Waves 2 to 4 ft building to 4 to 6 ft
occasionally to 8 ft.
.MONDAY...Southeast winds to 30 kt veering to southwest. Rain
showers. Waves 5 to 8 ft occasionally to 10 ft.
.MONDAY NIGHT...Northwest winds to 30 kt. Waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft.
.TUESDAY...Northwest winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY...South winds 10 to 15 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190315-
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-
259 PM CDT Fri Apr 18 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southwest winds to 30 kt veering to northwest 15 to
25 kt. Chance of rain showers and thunderstorms. Waves 4 to 6 ft
occasionally to 8 ft.
.SATURDAY...Northwest winds 10 to 20 kt veering to northeast
10 to 15 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SATURDAY NIGHT...East winds 5 to 10 kt becoming northeast 10 to
15 kt. Waves 1 to 2 ft.
.SUNDAY...East winds 10 to 20 kt. Chance of rain showers. Waves
2 to 4 ft.
.SUNDAY NIGHT...East winds 15 to 25 kt becoming southeast. Rain
showers likely with a chance of thunderstorms in the evening,
then rain showers overnight. Waves 3 to 5 ft building to 4 to
7 ft occasionally to 9 ft.
.MONDAY...South winds 15 to 25 kt becoming southwest to 30 kt.
Rain showers likely in the morning, then chance of rain showers
in the afternoon. Waves 5 to 8 ft occasionally to 10 ft.
.MONDAY NIGHT...West winds 15 to 25 kt becoming northwest 10 to
20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.TUESDAY...Northwest winds 10 to 20 kt backing to southeast 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY...South winds 10 to 15 kt. Waves 1 to 3 ft.

$$

LMZ761-190315-
MAFOR 1822/
MICHIGAN NORTH 11720 12830 12730 12720 11820. A chance of rain
showers and thunderstorms this evening, then a chance of rain
showers overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet
tonight. Waves 1 to 3 feet Saturday.

MICHIGAN SOUTH 11430 11530 12730 11720 12710 11110. A chance of
rain showers and thunderstorms tonight. Waves 3 to 5 feet
tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Saturday.

$$


Patterson

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

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