544
FZUS63 KMKX 200218
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
918 PM CDT Sun Jul 19 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 currently overspreads Lake Michigan, with areas of
denser smoke reducing visibility to around 1 nautical mile at
times. A Marine Dense Smoke Advisory is in effect across Lake
Michigan into early Monday morning.

High pressure will continue to exit southeastward tonight, with
29.4 inch low pressure tracking southeastward across Manitoba and
Ontario Canada into Monday. South to southwest winds build across
the lake tonight, becoming gusty into Monday. A few gusts to gale
force will be possible Monday afternoon and evening over the
northern half of the lake. Strong to severe thunderstorms will
also be possible Monday afternoon through Monday night across the
lake.

A cold front crosses the lake Monday night into Tuesday morning.
Winds veer northwest and become gusty again as it passes. Winds
veer due north later Tuesday into Tuesday night with gusts to
gale force possible.

LMZ261-362-364-366-563-565-567-868-200930-
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-
918 PM CDT Sun Jul 19 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 7 AM CDT MONDAY...

.REST OF TONIGHT...South winds 10 to 20 kt becoming southwest
15 to 25 kt. Patchy smoke. Waves 2 to 4 ft.
.MONDAY...Southwest winds 15 to 25 kt becoming south gales to
35 kt. Patchy smoke. Chance of showers and thunderstorms in the
afternoon. Waves 3 to 5 ft building to 6 to 9 ft occasionally to
12 ft.
.MONDAY NIGHT...South gales to 40 kt becoming southwest gales to
35 kt late in the evening, then diminishing to 30 kt after
midnight becoming west late. Patchy smoke in the evening. Chance
of showers and thunderstorms. Waves 6 to 9 ft occasionally to
12 ft subsiding to 4 to 7 ft occasionally to 9 ft.
.TUESDAY...Northwest winds to 30 kt increasing to gales to 35 kt.
Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft
occasionally to 10 ft.
.TUESDAY NIGHT...North gales to 35 kt. Waves 8 to 11 ft
occasionally to 14 ft.
.WEDNESDAY...North gales to 35 kt diminishing to 30 kt. Waves
8 to 11 ft occasionally to 14 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.WEDNESDAY NIGHT...West winds 15 to 25 kt becoming southwest 5 to
10 kt. Waves 3 to 5 ft subsiding to 1 to 2 ft.
.THURSDAY...Southwest winds 10 to 20 kt increasing to 15 to
25 kt. Waves 1 to 2 ft building to 1 to 3 ft.
.FRIDAY...West winds 10 to 20 kt becoming northwest. Waves 1 to
3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-200930-
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-
918 PM CDT Sun Jul 19 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 7 AM CDT MONDAY...

.REST OF TONIGHT...East winds 5 to 10 kt veering to south. Patchy
smoke. Waves 1 to 2 ft.
.MONDAY...South winds 10 to 20 kt increasing to 30 kt. Patchy
smoke. Waves 2 to 4 ft building to 4 to 7 ft occasionally to
9 ft.
.MONDAY NIGHT...South winds to 30 kt becoming west. Chance of
showers and thunderstorms. Waves 5 to 8 ft occasionally to 10 ft.
.TUESDAY...West winds to 30 kt becoming northwest. Waves 5 to
8 ft occasionally to 10 ft.
.TUESDAY NIGHT...North gales to 35 kt. Waves 8 to 12 ft
occasionally to 16 ft.
.WEDNESDAY...North gales to 35 kt diminishing to 30 kt. Waves
8 to 12 ft occasionally to 16 ft subsiding to 8 to 11 ft
occasionally to 14 ft.
.WEDNESDAY NIGHT...Northeast winds to 30 kt becoming northwest
5 to 10 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to
3 to 5 ft.
.THURSDAY...West winds 10 to 15 kt becoming southwest 10 to
20 kt. Waves 1 to 3 ft.
.FRIDAY...West winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.

$$

LMZ761-200930-
MAFOR 2004/
MICHIGAN NORTH 13530 11540 13450 11550. A chance of showers
Monday afternoon. A chance of showers and thunderstorms Monday
evening. Waves 1 to 3 feet building to 2 to 4 feet overnight.
Waves 2 to 4 feet building to 5 to 8 feet Monday. Waves 6 to 9
feet Monday evening.

MICHIGAN SOUTH 11310 11410 11420 11520 11430 12440 11540. A
chance of showers and thunderstorms Monday evening. Waves 2 feet
or less overnight. Waves 1 to 3 feet building to 4 to 7 feet
Monday. Waves 4 to 7 feet Monday evening.

$$


CMiller

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

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