970
FZUS63 KMKX 301341
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
841 AM 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 southern Illinois by
Saturday morning. 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 afternoon as high pressure of 30.0 inches builds over Lake
Superior.

LMZ261-362-364-366-563-565-567-868-302115-
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-
841 AM CDT Thu Jul 30 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southwest winds 5 to 10 kt becoming south 10 to
20 kt. Patchy smoke. Waves 1 to 3 ft.
.TONIGHT...Southwest winds 10 to 20 kt diminishing to 10 to
15 kt. Slight chance of showers and thunderstorms overnight.
Waves 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Chance of showers in the afternoon. Waves 1 to 2 ft.
.FRIDAY NIGHT...West winds 10 to 15 kt becoming northwest. Chance
of showers. Waves 1 to 2 ft.
.SATURDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.SATURDAY NIGHT...North winds 10 to 20 kt. Waves 1 to 3 ft
building to 2 to 4 ft.
.SUNDAY...Northeast winds 15 to 25 kt becoming north to 30 kt.
Waves 3 to 5 ft.
.MONDAY...Southeast winds 5 to 10 kt becoming south 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-302115-
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-
841 AM CDT Thu Jul 30 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...West winds 5 to 10 kt becoming southwest early
this afternoon, then becoming south 10 to 20 kt late. Waves 1 to
2 ft.
.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 10 to
15 kt. Waves 1 to 2 ft.
.FRIDAY NIGHT...East winds 10 to 20 kt becoming northeast.
Showers likely. Waves 1 to 3 ft building to 3 to 5 ft.
.SATURDAY...Northeast winds 15 to 25 kt increasing to 30 kt.
Chance of showers in the morning. Waves 4 to 6 ft occasionally to
8 ft.
.SATURDAY NIGHT...Northeast winds 15 to 25 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.SUNDAY...North winds 15 to 25 kt increasing to 30 kt. Waves 4 to
6 ft occasionally to 8 ft.
.MONDAY...East winds 5 to 10 kt increasing to 10 to 20 kt. Waves
2 to 4 ft subsiding to 1 to 2 ft.

$$

LMZ761-302115-
MAFOR 3016/
MICHIGAN NORTH 11520 11420 11520 14510 11510. Waves 2 feet or
less this afternoon. Waves 1 to 3 feet tonight. Waves 2 feet or
less Friday morning.

MICHIGAN SOUTH 11510 13410 12510 11500 11400. Waves 2 feet or
less.

$$


Sheppard

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

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