528
FZUS63 KMKX 301943
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
243 PM CDT Thu Jul 30 2026

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...

Light and variable winds will take on a southerly component this
afternoon as high pressure around 30.0 inches starts to drift
toward the Lower Great Lakes. Low pressure around 29.7 inches will
track across Iowa Friday and through Illinois Saturday. The
approaching area of low pressure will bring chances for showers
and a few thunderstorms Friday into Saturday. Severe weather is
not expected in any of this activity. Breezy northeast winds
will develop Saturday and should continue through Sunday
as high pressure of 30.0 inches builds over Lake Superior. A
few gusts upwards of 30 kt will be possible over the southern
half of the lake.

LMZ261-362-364-366-563-565-567-868-310315-
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-
243 PM CDT Thu Jul 30 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds 10 to 20 kt diminishing to 10 to
15 kt. Slight chance of showers overnight. Waves 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Chance of showers and slight chance of thunderstorms in the
morning, then slight chance of showers and thunderstorms in the
afternoon. Waves 1 to 3 ft.
.FRIDAY NIGHT...Southwest winds 10 to 15 kt veering to northeast
10 to 20 kt. Chance of showers. Waves 1 to 2 ft building to 2 to
4 ft.
.SATURDAY...Northeast winds 10 to 20 kt becoming north 15 to
25 kt. Chance of showers. Waves 2 to 4 ft.
.SATURDAY NIGHT...North winds 15 to 25 kt becoming northeast.
Waves 3 to 5 ft.
.SUNDAY...Northeast winds to 30 kt becoming north. Waves 4 to
7 ft occasionally to 9 ft.
.SUNDAY NIGHT...North winds to 30 kt becoming northeast 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.MONDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 1 to 2 ft.
.TUESDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-310315-
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-
243 PM CDT Thu Jul 30 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Waves 1 to 3 ft.
.FRIDAY...Southwest winds 5 to 10 kt backing to southeast. Waves
1 to 3 ft.
.FRIDAY NIGHT...East winds 10 to 15 kt increasing to 15 to 25 kt.
Chance of showers in the evening, then showers likely overnight.
Waves 1 to 3 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...East winds to 30 kt becoming northeast. Showers
likely. Waves 4 to 7 ft occasionally to 9 ft.
.SATURDAY NIGHT...Northeast winds to 30 kt. Chance of showers in
the evening. Waves 5 to 8 ft occasionally to 10 ft.
.SUNDAY...North winds to 30 kt. Waves 6 to 9 ft occasionally to
12 ft.
.SUNDAY NIGHT...North winds to 30 kt becoming northeast 10 to
20 kt. Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to
7 ft occasionally to 9 ft.
.MONDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TUESDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ761-310315-
MAFOR 3022/
MICHIGAN NORTH 12520 14510 11510 11520. A chance of showers
Friday morning. Waves 1 to 3 feet tonight. Waves 2 feet or less
Friday.

MICHIGAN SOUTH 12410 12510 11500 11400 11410 11310. Waves 1 to 3
feet tonight. Waves 2 feet or less Friday.

$$


Sheppard

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

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