496
FZUS63 KMKX 171420
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
920 AM CDT Tue Jun 17 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 around 29.5 inches will move from far northern Lake
Superior east into Quebec by late in the day. Its cold front
extending southward over Wisconsin will weaken and stall as it
moves into Lake Michigan later today and tonight.

Another low pressure area of 29.6 inches will cross eastern Iowa
Wednesday morning and reach central Lower Michigan by Wednesday
evening while strengthening to 29.4 inches. High pressure of 30.0
inches will set up over the Plains Thursday, with the top of the
ridge over Lake Superior and northern Lake Michigan.

Expect modest southerly winds this morning with winds becoming
light and variable late today and tonight as the front weakens and
stalls over the lake. Variable winds are expected for Wednesday as
low pressure moves across central Lake Michigan in the afternoon
and early evening. Modest north to northwest winds are then
forecast in the wake of the low for Wednesday night into Thursday
morning then turning westerly.

LMZ261-362-364-366-563-565-567-868-172130-
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-
920 AM CDT Tue Jun 17 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Southwest winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 2 to 4 ft.
.TONIGHT...Southwest winds 10 to 15 kt becoming southeast. Slight
chance of showers and thunderstorms overnight. Waves 1 to 3 ft
subsiding to 1 to 2 ft.
.WEDNESDAY...Southeast winds 5 to 10 kt becoming east 10 to
15 kt, then becoming northeast 10 to 20 kt late. Chance of
showers in the morning, then showers likely in the afternoon.
Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt becoming north
10 to 15 kt. Chance of showers. Waves 1 to 3 ft.
.THURSDAY...West winds 10 to 20 kt becoming southwest. Waves 1 to
2 ft.
.THURSDAY NIGHT...West winds 10 to 15 kt becoming northwest.
Chance of showers. Waves 1 to 2 ft.
.FRIDAY...North winds 10 to 15 kt veering to south 10 to 20 kt.
Chance of showers. Waves 1 to 3 ft.
.SATURDAY...South winds 15 to 25 kt. Chance of showers and
thunderstorms. Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-172130-
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-
920 AM CDT Tue Jun 17 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 10 to 20 kt. Slight chance of
showers and thunderstorms this afternoon. Waves 1 to 3 ft.
.TONIGHT...South winds 10 to 20 kt diminishing to 10 to 15 kt.
Chance of showers and thunderstorms. Waves 1 to 3 ft.
.WEDNESDAY...South winds 5 to 10 kt increasing to 10 to 20 kt.
Showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 kt. Chance of showers
and thunderstorms in the evening, then chance of showers
overnight. Waves 2 to 4 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming southwest. Waves
2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 10 to 15 kt. Waves 1 to 2 ft.
.FRIDAY...West winds 10 to 15 kt backing to south 10 to 20 kt.
Waves 1 to 3 ft.
.SATURDAY...South winds 15 to 25 kt. Waves 4 to 7 ft occasionally
to 9 ft.

$$

LMZ761-172130-
MAFOR 1716/
MICHIGAN NORTH 11530 11520 11510 12400 12300 11200. A chance of
showers Wednesday morning. Waves 2 to 4 feet subsiding to 1 to 3
feet this afternoon. Waves 2 feet or less tonight and Wednesday
morning.

MICHIGAN SOUTH 12420 11410 12510 11400 11410 11406. A chance of
thunderstorms tonight. Waves 2 feet or less.

$$


Gehring

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

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