088
FZUS63 KMKX 170758
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
258 AM CDT Fri Jul 17 2026

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...

Wildfire smoke from northern MN and northwestern Ontario continues
across all open waters of Lake Michigan and will reduce visibility
to 1 nm or less at times. Thus a Marine Dense Smoke Advisory
continues today through this evening for all open waters.

Lighter winds continue as high pressure around 30.1 inches in mid
Michigan gradually exits east toward the New England states ahead
of an incoming low pressure around 29.7 inches tracking in from
the Northern Plains. This low pressure will shift winds across
Lake Michigan to the southwest today and continue to push across
Ontario tonight through Saturday dragging a cold front across the
lake through Saturday morning. Northerly winds will develop
behind this frontal passage through the day Saturday along with
high pressure around 30.0 inches. The high will then work its way
across the Upper Great through the day Sunday and departing to the
east overnight Sunday while another deepening low tracks across
Ontario for the start of next week. Expect more southerly wind for
Monday before another, stronger cold front pushes through the
region by Tuesday.

Additionally will see periodic shower and thunderstorm chances
across the lake heading into the weekend through the start of next
week.

LMZ261-362-364-366-563-565-567-868-171515-
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-
258 AM CDT Fri Jul 17 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.TODAY...Southeast winds 10 to 15 kt becoming south 10 to 20 kt.
Smoke. Slight chance of showers and thunderstorms this morning,
then slight chance of showers this afternoon. Waves 1 to 2 ft.
.TONIGHT...South winds 10 to 20 kt increasing to 15 to 25 kt late
in the evening, then becoming southwest to 30 kt overnight.
Smoke. Chance of showers and thunderstorms. Waves 1 to 3 ft
building to 3 to 5 ft.
.SATURDAY...West winds 15 to 25 kt becoming north to 30 kt. Waves
3 to 5 ft.
.SATURDAY NIGHT...North winds to 30 kt diminishing to 10 to 20 kt
overnight. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.SUNDAY...Northeast winds 5 to 10 kt veering to southwest 10 to
20 kt in the afternoon. Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.MONDAY...Southwest gales to 35 kt increasing to gales to 40 kt.
Showers likely. Waves 4 to 6 ft occasionally to 8 ft building to
6 to 9 ft occasionally to 12 ft.
.TUESDAY...Northwest gales to 35 kt increasing to gales to 40 kt.
Waves 5 to 8 ft occasionally to 10 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-171515-
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-
258 AM CDT Fri Jul 17 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.TODAY...Southeast winds 10 to 15 kt becoming south. Smoke.
Slight chance of showers this afternoon. Waves 1 to 2 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 15 to
25 kt. Waves 2 to 4 ft.
.SATURDAY...West winds 15 to 25 kt veering to north to 30 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...North winds to 30 kt becoming northeast 10 to
20 kt overnight. Waves 4 to 7 ft occasionally to 9 ft.
.SUNDAY...Northeast winds 10 to 15 kt becoming north 10 to 20 kt.
Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SUNDAY NIGHT...East winds 10 to 15 kt veering to south 10 to
20 kt. Waves 1 to 3 ft.
.MONDAY...South winds to 30 kt increasing to gales to 35 kt.
Chance of showers. Waves 4 to 6 ft occasionally to 8 ft building
to 5 to 8 ft occasionally to 10 ft.
.TUESDAY...Northwest winds to 30 kt increasing to gales to 35 kt.
Waves 5 to 8 ft occasionally to 10 ft.

$$

LMZ761-171515-
MAFOR 1710/
MICHIGAN NORTH 12310 12410 11420 11430 11546 11540. A chance of
thunderstorms tonight. Waves 2 feet or less today. Waves 1 to 3
feet building to 2 to 4 feet tonight.

MICHIGAN SOUTH 11310 14410 11420 11520 11530. Waves 1 foot or
less today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

$$


Patterson

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

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