621
FZUS63 KMKX 192049
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
249 PM CST Wed Nov 19 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 of 30.3 inches continues eastward from the Great
Lakes region tonight into Thursday, allowing light south winds to
develop tonight, turning southwest and becoming breezy over
northern portions of the lake Thursday afternoon and evening (20
to 25 KT gusts). Low pressure around 29.5 inches tracking east
across Canada drags a weak cold front across the lake Thursday
evening, with winds veering west to northwest and decelerating
behind it. Light north to northwest winds continue into Friday,
becoming light and variable into early Saturday as weak high
pressure passes over the lake.

LMZ261-362-364-366-563-565-567-868-200430-
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-
249 PM CST Wed Nov 19 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 2 to 4 ft.
.THURSDAY...Southwest winds 10 to 20 kt increasing to 15 to
25 kt. Slight chance of rain in the morning, then chance of rain
in the afternoon. Waves 2 to 4 ft building to 4 to 6 ft
occasionally to 8 ft.
.THURSDAY NIGHT...Southwest winds 15 to 25 kt becoming northwest
10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to
2 to 4 ft.
.FRIDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt diminishing to 5 to 10 kt
overnight. Waves 1 to 3 ft.
.SATURDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 3 ft.
.SATURDAY NIGHT...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.SUNDAY...Southwest winds 10 to 20 kt becoming west 15 to 25 kt.
Waves 2 to 4 ft.
.MONDAY...West winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-200430-
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-
249 PM CST Wed Nov 19 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Southeast winds 5 to 10 kt becoming southwest. Waves
1 to 2 ft.
.THURSDAY...Southwest winds 10 to 15 kt increasing to 10 to
20 kt. Slight chance of rain in the afternoon. Waves 1 to 3 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt veering to
northwest 10 to 15 kt. Waves 2 to 4 ft.
.FRIDAY...Northwest winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 2 to 4 ft.
.FRIDAY NIGHT...North winds 10 to 15 kt becoming northeast. Waves
2 to 4 ft.
.SATURDAY...East winds 10 to 15 kt veering to south. Waves 2 to
4 ft.
.SATURDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 2 to 4 ft building to 3 to 5 ft.
.SUNDAY...Southwest winds 10 to 20 kt. Waves 3 to 5 ft.
.MONDAY...West winds 10 to 15 kt increasing to 10 to 20 kt. Waves
2 to 4 ft.

$$

LMZ761-200430-
MAFOR 1923/
MICHIGAN NORTH 11410 11420 13520 13530. A chance of rain Thursday
afternoon. Waves 1 to 3 feet tonight. Waves 1 to 3 feet building
to 3 to 5 feet Thursday.

MICHIGAN SOUTH 12300 12400 11500 11510 12520. Waves 1 foot or
less tonight. Waves 1 to 3 feet Thursday.

$$


Sheppard

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

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