625
FZUS63 KMKX 150808
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
308 AM 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...

Southerly winds continue to increase today into Wednesday as
high pressure over the northern Ohio River Valley slides east to
the Mid Atlantic States. Then looking at broad low pressure around
29.7 inches and a cold front to track across southern WI and lower
half of Lake Michigan Wednesday through Wednesday night. Will see
showers and thunderstorms accompany this low pressure as it
pushes through the region. Cold front looks to push southeast of
Lake Michigan later Wednesday turning winds to the north behind
it. Northerly winds will persist into Thursday, but should
gradually weaken and turn more easterly Thursday night into Friday
as high pressure around 30.2 inches builds across the Upper Great
Lakes.

LMZ261-362-364-366-563-565-567-868-151530-
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-
308 AM CDT Tue Jul 15 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 20 kt. Waves 2 to 4 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY...Southwest winds 5 to 10 kt veering to north 10 to
15 kt. Chance of showers in the afternoon. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming north
10 to 20 kt. Chance of showers and thunderstorms in the evening,
then showers likely with a chance of thunderstorms overnight.
Waves 1 to 3 ft.
.THURSDAY...North winds 15 to 25 kt increasing to 30 kt. Waves
3 to 5 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northeast
10 to 20 kt. Waves 3 to 5 ft.
.FRIDAY...East winds 10 to 15 kt becoming north. Waves 1 to 3 ft.
.SATURDAY...South winds 10 to 15 kt. Chance of showers. Waves
1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-151530-
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-
308 AM CDT Tue Jul 15 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 5 to 10 kt increasing to 10 to 15 kt late
this morning, then increasing to 10 to 20 kt early this afternoon
becoming southeast late. Waves 1 to 3 ft.
.TONIGHT...Southeast winds 10 to 20 kt becoming south 10 to 15 kt
late in the evening, then diminishing to 5 to 10 kt after
midnight becoming south 5 to 10 kt late. Waves 1 to 3 ft
subsiding to 1 to 2 ft.
.WEDNESDAY...South winds 5 to 10 kt becoming southeast 10 to
15 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt backing to west
10 to 20 kt. Showers likely with a chance of thunderstorms in the
evening, then chance of showers overnight. Waves 1 to 3 ft.
.THURSDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Chance of showers. Waves 3 to 5 ft.
.THURSDAY NIGHT...North winds 15 to 25 kt becoming northeast
10 to 20 kt. Waves 3 to 5 ft.
.FRIDAY...Northeast winds 10 to 15 kt. Waves 2 to 4 ft.
.SATURDAY...South winds 10 to 15 kt. Chance of showers. Waves
1 to 2 ft.

$$

LMZ761-151530-
MAFOR 1510/
MICHIGAN NORTH 11410 14420 11420 11520 11510. Waves 1 to 3 feet
building to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1
to 3 feet tonight.

MICHIGAN SOUTH 11400 12410 11320 12310 12400. Waves 2 feet or
less.

$$


Wagner

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

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