563
FZUS63 KMKX 302034
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
333 PM CDT Tue Jun 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...

Modest to breezy southerly winds will prevail into Thursday then
lighter into Friday as high pressure around 30.1 inches remains
to the southeast of the Great Lakes, while troughs of low pressure
around 29.2 inches continue over Canada into the northern Great
Plains. Scattered thunderstorms are forecast across the northern
half tonight through Wednesday night, and across the southern two
thirds Thursday into Friday, and across the whole lake Friday into
Saturday as a cold front shifts winds to northerly. Patchy marine
fog will be possible at times, primarily over the northern half of
the lake, as a warm moist air mass moves over the lake.

LMZ261-362-364-366-563-565-567-868-010300-
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-
333 PM CDT Tue Jun 30 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southwest winds to 30 kt diminishing to 10 to 20 kt.
Slight chance of thunderstorms with isolated showers this
evening, then scattered showers and slight chance of
thunderstorms overnight. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 3 to 5 ft.
.WEDNESDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Patchy fog in the morning. Slight chance of thunderstorms
with isolated showers in the morning, then scattered showers and
slight chance of thunderstorms in the afternoon. Waves 2 to 4 ft
building to 3 to 5 ft.
.WEDNESDAY NIGHT...South winds 15 to 25 kt becoming southwest.
Scattered showers with a chance of thunderstorms in the evening,
then numerous showers with a chance of thunderstorms overnight.
Waves 4 to 6 ft occasionally to 8 ft.
.THURSDAY...Southwest winds 15 to 25 kt. Scattered showers. Waves
3 to 5 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt diminishing to 5 to
10 kt overnight. Scattered showers with a chance of thunderstorms
in the evening, then numerous showers overnight. Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 15 kt becoming southwest 10 to 20 kt.
Numerous showers in the morning, then numerous showers with a
chance of thunderstorms in the afternoon. Waves 1 to 2 ft.
.FRIDAY NIGHT...Southwest winds 10 to 15 kt veering to north.
Showers likely with a chance of thunderstorms. Waves 1 to 2 ft.
.SATURDAY...Northeast winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 3 ft.
.SUNDAY...Northeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-010300-
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-
333 PM CDT Tue Jun 30 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.WEDNESDAY...Southwest winds 10 to 20 kt becoming south 15 to
25 kt. Waves 2 to 4 ft building to 3 to 5 ft.
.WEDNESDAY NIGHT...South winds 15 to 25 kt becoming southwest
10 to 20 kt. Scattered showers overnight. Waves 4 to 6 ft
occasionally to 8 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Scattered showers with a
chance of thunderstorms in the afternoon. Waves 3 to 5 ft.
.THURSDAY NIGHT...Southwest winds 10 to 15 kt. Scattered showers
with a chance of thunderstorms in the evening, then scattered
showers overnight. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt.
Scattered showers in the morning, then scattered showers with a
chance of thunderstorms in the afternoon. Waves 1 to 2 ft.
.FRIDAY NIGHT...Southwest winds 10 to 15 kt becoming west.
Showers likely with a chance of thunderstorms. Waves 1 to 2 ft.
.SATURDAY...Northwest winds 10 to 15 kt becoming north 10 to
20 kt. Waves 1 to 3 ft.
.SUNDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 1 to 3 ft.

$$
LMZ761-010300-
MAFOR 3022 AMD/
MICHIGAN NORTH 11440 12430 11520 19526 11520 11510 11520 19526
11420. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight. Waves
1 to 3 feet building to 2 to 4 feet Wednesday.

MICHIGAN SOUTH 11430 14520 11520 12420. Waves 2 to 4 feet
subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet Wednesday.

$$


WFO MKX

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

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