148
FZUS63 KMKX 151917
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
217 PM CDT Tue Jul 15 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...

A slow moving front will approach Lake Michigan from the
northwest tonight as high pressure of 30.0 inches retreats east
toward the east coast. Low pressure of 29.7 inches will then
approach lake Michigan from the Iowa/Minnesota border by Wednesday
evening, bringin chances for thunderstorms over most of the lake.

Winds will remain southerly and light to moderate over most of the
lake through tonight, until the front sinks south over the lake
during the post dawn hours tomorrow. The front will then stay
stationary over the lake with north winds over the northern half
and south winds over the southern half of the Lake into Wednesday
night. Winds will then come around to northwesterly following the
passage of the surface low Wednesday night into Thursday morning.
Gusty winds are then expected Thursday as the pressure gradient
gets squeezed between the departing low pressure, and strong high
pressure of 30.2 inches over the northern plains.

LMZ261-362-364-366-563-565-567-868-160330-
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-
217 PM CDT Tue Jul 15 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds to 30 kt diminishing to 10 to 20 kt. Waves
3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY...Southwest winds 10 to 15 kt veering to north 10 to
20 kt. Slight chance of showers and thunderstorms in the
afternoon. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt becoming north.
Showers likely with a chance of thunderstorms in the evening,
then showers likely overnight. Waves 2 to 4 ft.
.THURSDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
4 to 6 ft occasionally to 8 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northeast
10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to
2 to 4 ft.
.FRIDAY...East winds 10 to 15 kt backing to west. Waves 1 to
3 ft.
.FRIDAY NIGHT...East winds 5 to 10 kt becoming south. 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.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-160330-
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-
217 PM CDT Tue Jul 15 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$

LMZ761-160330-
MAFOR 1522/
MICHIGAN NORTH 12430 11530 11420 11510 11610 12810. Waves 2 to 4
feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less
Wednesday.

MICHIGAN SOUTH 11320 11310 15410. Waves 2 feet or less.

$$


CMiller

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

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