021
FZUS63 KMKX 180220
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
920 PM 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...

Areas of smoke will continue over the north half of the lake
tonight. Otherwise breezy southwest to west winds will develop
ahead of a cold front. The low pressure area around 29.7 inches
will track from just north of Lake Superior tonight across
southern Quebec Saturday afternoon and deepen to 29.4 inches. Its
trailing cold front will track from northern Lake Michigan
Saturday morning to far southern Lake Michigan by early afternoon.
Smoke will return to Lake Michigan behind the cold front and may
become dense once again. Breezy northerly winds are forecast
behind the cold front and will linger into Saturday evening.

Winds then quickly taper Saturday night, as high pressure around
30.1 inches moves over the northern Great Lakes. Northeast to
light and variable winds are then expected through Sunday into
Sunday night. Gusty south to southwest winds may then develop
Monday into Monday night, with gusty west to northwest winds
possible into the middle of next week.

LMZ261-362-364-366-563-565-567-868-180930-
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 PM CDT Fri Jul 17 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 10 PM CDT THIS EVENING...

.REST OF TONIGHT...South winds 15 to 25 kt becoming west to
30 kt. Areas of smoke late this evening, then patchy smoke
overnight. Chance of showers and thunderstorms. Waves 3 to 5 ft.
.SATURDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Areas of smoke. Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...North winds to 30 kt becoming northeast 10 to
15 kt. Smoke. Waves 4 to 6 ft occasionally to 8 ft subsiding to
2 to 4 ft.
.SUNDAY...Northeast winds 5 to 10 kt veering to southwest 10 to
20 kt in the afternoon. Areas of smoke. Waves 1 to 3 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest 15 to
25 kt. Areas of smoke in the evening. 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 in the morning, then showers likely with a chance
of thunderstorms in the afternoon. Waves 4 to 7 ft occasionally
to 9 ft building to 7 to 10 ft occasionally to 13 ft.
.MONDAY NIGHT...Southwest gales to 35 kt becoming west to 30 kt.
Chance of showers. Waves 7 to 10 ft occasionally to 13 ft
subsiding to 5 to 8 ft occasionally to 10 ft.
.TUESDAY...Northwest winds to 30 kt increasing to gales to 40 kt.
Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...Northwest gales to 35 kt. Waves 8 to 11 ft
occasionally to 14 ft subsiding to 6 to 9 ft occasionally to
12 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-180930-
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 PM CDT Fri Jul 17 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Southwest winds 10 to 20 kt increasing to
15 to 25 kt. Patchy smoke. Waves 2 to 4 ft.
.SATURDAY...West winds 15 to 25 kt veering to north to 30 kt.
Slight chance of showers and thunderstorms in the morning, then
chance of showers and thunderstorms in the afternoon. Patchy
smoke in the afternoon. Waves 3 to 5 ft building to 4 to 7 ft
occasionally to 9 ft.
.SATURDAY NIGHT...North winds to 30 kt becoming northeast 10 to
20 kt. Areas of smoke. Waves 4 to 7 ft occasionally to 9 ft
subsiding to 4 to 6 ft occasionally to 8 ft.
.SUNDAY...Northeast winds 10 to 15 kt becoming north. Areas of
smoke. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SUNDAY NIGHT...Southeast winds 10 to 15 kt becoming south 10 to
20 kt. Areas of smoke in the evening. Waves 1 to 2 ft building to
1 to 3 ft.
.MONDAY...South winds to 30 kt increasing to gales to 35 kt.
Chance of showers in the morning, then 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...Southwest gales to 35 kt diminishing to 30 kt.
Showers likely with a chance of thunderstorms. Waves 6 to 9 ft
occasionally to 12 ft.
.TUESDAY...West winds to 30 kt becoming northwest gales to 35 kt.
Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft
occasionally to 10 ft.
.WEDNESDAY...Northwest gales to 35 kt becoming north. Waves 8 to
12 ft occasionally to 16 ft.

$$

LMZ761-180930-
MAFOR 1804/
MICHIGAN NORTH 11540 11530 11630 11730 11830 12840 11830. A
chance of showers and thunderstorms overnight. Waves 2 to 4 feet
building to 3 to 5 feet, then subsiding to 2 to 4 feet overnight.
Waves 2 to 4 feet building to 3 to 5 feet Saturday. Waves 3 to 5
feet Saturday evening.

MICHIGAN SOUTH 11520 11530 12630 11730 13840. A chance of showers
and thunderstorms Saturday afternoon. Waves 1 to 3 feet building
to 2 to 4 feet overnight. Waves 2 to 4 feet building to 3 to 6
feet Saturday. Waves 4 to 7 feet Saturday evening.

$$


Gehring

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

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