626
FZUS63 KMKX 031942
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
242 PM CDT Wed Sep 3 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...

Low pressure of 29.4 inches over southern Ontario will meander
north and then northwest tonight into Thursday while deepening to
29.2 inches. The low will remain nearly stationary Friday, before
lifting northeast Friday night into Saturday. Breezy west to
northwest winds through tonight will become southerly by Thursday
night and then westerly by Friday morning ans a secondary low of
29.3 inches moves through northern Lake Michigan. This low will
bring a tighter pressure gradient, with increasing confidence in a
period of gales Thursday night into Friday morning. Thus a Gale
Watch has been issued for this period. Winds will then gradually
ease later Friday into the weekend as high pressure of 30.3 inches
moves in from the northwest.

LMZ261-362-364-366-563-565-567-868-040315-
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-
242 PM CDT Wed Sep 3 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
AFTERNOON...

.TONIGHT...Northwest winds 15 to 25 kt becoming west. Slight
chance of waterspouts. Waves 4 to 7 ft occasionally to 9 ft
subsiding to 4 to 6 ft occasionally to 8 ft.
.THURSDAY...West winds 15 to 25 kt becoming southwest. Slight
chance of waterspouts in the morning. Waves 3 to 5 ft.
.THURSDAY NIGHT...Southwest winds 15 to 25 kt increasing to 30 kt
after midnight, then becoming south gales to 40 kt late. Showers
overnight. Waves 3 to 5 ft building to 8 to 12 ft occasionally to
16 ft.
.FRIDAY...West gales to 40 kt diminishing to 30 kt in the
afternoon. Showers in the morning. Waves 10 to 14 ft occasionally
to 18 ft subsiding to 7 to 10 ft occasionally to 13 ft.
.FRIDAY NIGHT...West winds to 30 kt diminishing to 15 to 25 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to 6 ft
occasionally to 8 ft.
.SATURDAY...West winds 15 to 25 kt. Chance of showers. Waves 3 to
5 ft.
.SATURDAY NIGHT...Northwest winds 10 to 20 kt diminishing to
10 to 15 kt. Waves 2 to 4 ft.
.SUNDAY...Northwest winds 10 to 20 kt. Waves 1 to 3 ft.
.MONDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-040315-
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-
242 PM CDT Wed Sep 3 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...GALE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
AFTERNOON...

.TONIGHT...Northwest winds 15 to 25 kt diminishing to 10 to
20 kt. Chance of showers this evening. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 6 ft occasionally to
8 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming west. Waves 4 to
6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt increasing to gales
to 40 kt. Chance of showers overnight. Waves 2 to 4 ft building
to 10 to 14 ft occasionally to 18 ft.
.FRIDAY...West gales to 40 kt diminishing to 30 kt in the
afternoon. Waves 10 to 14 ft occasionally to 18 ft subsiding to
8 to 11 ft occasionally to 14 ft.
.FRIDAY NIGHT...West winds 15 to 25 kt. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.
.SATURDAY...West winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.SUNDAY...Northwest winds 10 to 20 kt. Waves 3 to 5 ft.
.MONDAY...South winds 5 to 10 kt increasing to 10 to 15 kt. Waves
1 to 2 ft.

$$

LMZ761-040315-
MAFOR 0322/
MICHIGAN NORTH 14730 11630 12620 11630. Waves 3 to 6 feet
building to 4 to 7 feet, then subsiding to 3 to 6 feet tonight.
Waves 3 to 5 feet subsiding to 2 to 4 feet Thursday.

MICHIGAN SOUTH 13730 13720 12620. A chance of thunderstorms
early, then a chance of showers this evening. Waves 3 to 6 feet
building to 4 to 7 feet, then subsiding to 3 to 6 feet tonight.
Waves 3 to 5 feet subsiding to 1 to 3 feet Thursday.

$$


DDV

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

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