945
FZUS63 KMKX 081945
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
245 PM CDT Tue Jul 8 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 29.9 inches is moving east along the Wisconsin-
Upper Michigan border today. The low will continue east into
Lower Michigan tonight, dragging a cold front across Lake Michigan
in the process. The front`s passage will result in a northerly
wind shift across the open waters by Wednesday morning. Periods of
showers and thunderstorms are anticipated today through tonight.
Northerly winds will persist into Thursday morning, becoming light
and variable Thursday afternoon as 30.0 inch high pressure moves
across Lake Michigan. South to southeast winds will re-establish
on Friday as a broad area of 29.6 inch low pressure moves into the
northern Great Plains. Additional showers and thunderstorms are
forecast Friday through Saturday.

LMZ261-362-364-366-563-565-567-868-090315-
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-
245 PM CDT Tue Jul 8 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Southeast winds 10 to 15 kt backing to north. Chance
of showers and slight chance of thunderstorms this evening. Waves
1 to 2 ft.
.WEDNESDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt diminishing to 5 to
10 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.THURSDAY...North winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 ft or less.
.THURSDAY NIGHT...Southeast winds 5 to 10 kt becoming south.
Waves nearly calm.
.FRIDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.FRIDAY NIGHT...Southeast winds 10 to 15 kt. Chance of showers
and thunderstorms. Waves 1 to 3 ft.
.SATURDAY...South winds 10 to 20 kt becoming southwest. Chance of
showers. Waves 2 to 4 ft.
.SUNDAY...West winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-090315-
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-
245 PM CDT Tue Jul 8 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 10 to 15 kt veering to west 5 to 10 kt.
Chance of showers and thunderstorms this evening, then slight
chance of showers and thunderstorms overnight. Waves 1 to 2 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt becoming north 10 to
20 kt. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt diminishing to 5 to
10 kt. Waves 1 to 3 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Waves 1 to 2 ft.
.THURSDAY NIGHT...Northeast winds 5 to 10 kt becoming southeast.
Waves 1 ft or less.
.FRIDAY...Southeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.FRIDAY NIGHT...Southeast winds 10 to 15 kt becoming south 10 to
20 kt. Chance of showers and thunderstorms. Waves 1 to 3 ft.
.SATURDAY...Southwest winds 10 to 20 kt. Chance of showers. Waves
2 to 4 ft.
.SUNDAY...West winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.

$$

LMZ761-090315-
MAFOR 0822/
MICHIGAN NORTH 11310 11300 11200 11800 13810 11820. A chance of
showers this evening. Waves 2 feet or less.

MICHIGAN SOUTH 11410 12500 11600 11610 11710 11810 11820. A
chance of showers early, then a chance of showers and
thunderstorms this evening. Waves 2 feet or less.

$$


Patterson

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

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