677
FZUS63 KMKX 300804
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
304 AM CDT Sun Mar 30 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 stationary front remains over the southern quarter of the open
waters, draped diagonally from southwest to northeast. This front
is expected to move slightly northward early this morning before
back tracking as a cold front this evening. Winds north of the
front are northeasterly and gusty. Winds south of the front are
southerly. Low pressure of 29.5 inches over the Mid Mississippi
River Valley will continue to lift northeast, bringing gusty
southerly winds south of the front (southeastern third of the open
waters)this morning. This low pressure system will cross the
southern portions of Lake Michigan this afternoon, allowing the
front to move south and clear the lake by tonight. Gusty north to
northwest winds continue over the entire lake through Monday,
gradually diminishing Monday night.

LMZ261-362-364-366-563-565-567-868-301515-
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-
304 AM CDT Sun Mar 30 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...East winds to 30 kt becoming northeast. Rain, freezing
rain and slight chance of thunderstorms this morning, then rain
and freezing rain this afternoon. Waves 5 to 8 ft occasionally to
10 ft.
.TONIGHT...North gales to 35 kt. Rain and freezing rain in the
evening, then snow, rain, light sleet and freezing rain
overnight. Waves 7 to 10 ft occasionally to 13 ft building to
8 to 11 ft occasionally to 14 ft.
.MONDAY...North winds to 30 kt. Chance of snow in the morning.
Waves 8 to 11 ft occasionally to 14 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.MONDAY NIGHT...North winds to 30 kt diminishing to 10 to 20 kt
overnight. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.TUESDAY...Northeast winds 10 to 15 kt becoming east 10 to 20 kt.
Waves 2 to 4 ft.
.TUESDAY NIGHT...East winds 15 to 25 kt becoming southeast to
30 kt. Chance of snow. Waves 3 to 5 ft building to 7 to 10 ft
occasionally to 13 ft.
.WEDNESDAY...East gales to 40 kt becoming southeast. Rain. Waves
8 to 11 ft occasionally to 14 ft.
.THURSDAY...West winds to 30 kt. Waves 4 to 7 ft occasionally to
9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-301515-
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-
304 AM CDT Sun Mar 30 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southeast winds 10 to 20 kt becoming south to 30 kt,
then becoming southwest 15 to 25 kt late. Chance of rain and
slight chance of thunderstorms this morning, then rain likely
with slight chance of thunderstorms this afternoon. Waves 4 to
6 ft occasionally to 8 ft.
.TONIGHT...West winds to 30 kt becoming northwest. Chance of rain
and slight chance of thunderstorms in the evening, then chance of
rain and snow overnight. Waves 6 to 9 ft occasionally to 12 ft
building to 8 to 11 ft occasionally to 14 ft.
.MONDAY...North winds to 30 kt. Waves 8 to 11 ft occasionally to
14 ft subsiding to 7 to 10 ft occasionally to 13 ft.
.MONDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to
20 kt. Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to
6 ft occasionally to 8 ft.
.TUESDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 3 to 5 ft.
.TUESDAY NIGHT...East winds 15 to 25 kt increasing to gales to
35 kt. Chance of rain and snow. Waves 4 to 6 ft occasionally to
8 ft building to 8 to 11 ft occasionally to 14 ft.
.WEDNESDAY...Southeast gales to 35 kt diminishing to 30 kt. Rain.
Waves 8 to 12 ft occasionally to 16 ft.
.THURSDAY...West winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ761-301515-
MAFOR 3010/
MICHIGAN NORTH 14146 11146 11856 11847 11857. Waves 5 to 8 feet
today. Waves 5 to 9 feet building to 7 to 10 feet tonight.

MICHIGAN SOUTH 11320 11330 11440 11436 11636 11630 11737 11740.
Waves 2 to 4 feet building to 3 to 5 feet today. Waves 5 to 8
feet building to 6 to 10 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