065
FZUS63 KMKX 160812
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
312 AM CDT Wed Jul 16 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...

Southerly winds will increase this morning ahead of an
approaching low pressure around 29.7 inches and accompanying
front. Expect the low pressure over IA to move across southern WI
this afternoon and cross the middle portion of Lake Michigan
through the evening. Accompanying this system will be increased
thunderstorm chances which may produce strong, gusty winds across
Lake Michigan through the late afternoon and evening. Will first
see northerly winds gradually build down across the northern half
of the lake through the afternoon as the front shifts southeast
ahead the low pressure, which will move across the Lake later
this evening/tonight. Expect breezy northerly winds to migrate
into the southern half of the lake overnight and persist into
Thursday as high pressure around 30.2 inches builds into the Upper
Midwest. Lighter, shifting winds are expected for Friday as the
high pressure moves over the Upper Great Lakes. Increasing
southerly flow then returns for the start of the weekend.

LMZ261-362-364-366-563-565-567-868-161530-
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-
312 AM CDT Wed Jul 16 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southwest winds 10 to 15 kt veering to north 10 to
20 kt. Slight chance of showers and thunderstorms this afternoon.
Waves 1 to 3 ft.
.TONIGHT...North winds 15 to 25 kt. Showers likely with a chance
of thunderstorms. Waves 3 to 5 ft building to 4 to 7 ft
occasionally to 9 ft.
.THURSDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
4 to 7 ft occasionally to 9 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northeast
10 to 15 kt overnight. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.FRIDAY...Southeast winds 5 to 10 kt veering to southwest 10 to
15 kt. Waves 1 to 2 ft.
.FRIDAY NIGHT...South winds 5 to 10 kt. Waves 1 ft or less.
.SATURDAY...South winds 10 to 15 kt. Chance of showers. Waves
1 to 2 ft.
.SUNDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-161530-
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-
312 AM CDT Wed Jul 16 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 5 to 10 kt increasing to 10 to 20 kt. Slight
chance of showers and thunderstorms this afternoon. Waves 1 to
2 ft.
.TONIGHT...South winds 15 to 25 kt veering to northwest. Showers
likely with a chance of thunderstorms in the evening, then chance
of showers and slight chance of thunderstorms overnight. Waves
2 to 4 ft building to 4 to 7 ft occasionally to 9 ft.
.THURSDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Waves 6 to 9 ft occasionally to 12 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northeast
10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 6 ft occasionally to 8 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast 5 to 10 kt.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.FRIDAY NIGHT...Northeast winds 5 to 10 kt veering to southeast.
Waves 1 to 2 ft.
.SATURDAY...South winds 10 to 15 kt. Chance of showers. Waves
1 to 2 ft.
.SUNDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.

$$

LMZ761-161530-
MAFOR 1610/
MICHIGAN NORTH 11510 11610 11810 11820 11830 13836. A chance of
thunderstorms tonight. Waves 1 to 3 feet today. Waves 2 to 4 feet
building to 3 to 6 feet tonight.

MICHIGAN SOUTH 12400 12410 11426 11536 11630 11730. A chance of
thunderstorms this evening. Waves 2 feet or less today. Waves 2
to 4 feet building to 3 to 6 feet tonight.

$$


Wagner

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

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