480
FZUS63 KMKX 150150
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
850 PM CDT Fri Aug 14 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...

Periods of showers and storms are expected to cross the southern
half of Lake Michigan through Sunday as a front remains stalled
south over Illinois and Indiana. Low pressure of 29.8 inches over
Kansas will track to the northeast and east toward southern Lake
Michigan tonight into Saturday. This low should help to bump up
winds and waves across the southern two thirds of Lake Michigan
into Saturday. Beyond this system, a broad ridge of high pressure
of 30.1 inches will push into the Great Lakes early next week
before another potential front moves through the region midweek.

LMZ261-362-364-563-150930-
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 Rock Island Passage to Sturgeon Bay WI-
850 PM CDT Fri Aug 14 2026

STURGEON BAY WI TO POINT BETSIE MI NORTH...

.REST OF TONIGHT...Northeast winds 10 to 15 kt becoming east.
Waves 1 to 3 ft.
.SATURDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.SATURDAY NIGHT...East winds 10 to 20 kt veering to southwest
10 to 15 kt. Chance of showers overnight. Waves 1 to 3 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest 15 to 25 kt.
Chance of showers in the morning. Waves 1 to 2 ft building to
2 to 4 ft.
.SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 2 to 4 ft.
.MONDAY...Northwest winds 10 to 15 kt backing to southwest 10 to
20 kt. Waves 1 to 2 ft.
.MONDAY NIGHT...Southwest winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 2 ft.
.TUESDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
1 to 3 ft.
.WEDNESDAY...North winds 15 to 25 kt becoming northwest to 30 kt.
Chance of showers. Waves 1 to 3 ft.

$$

LMZ366-565-567-669-868-870-150930-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
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 Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
850 PM CDT Fri Aug 14 2026

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO PORT WASHINGTON WI TO
WHITEHALL MI...

.REST OF TONIGHT...Northeast winds 10 to 20 kt becoming east.
Slight chance of showers overnight. Waves 3 to 5 ft.
.SATURDAY...Southeast winds 10 to 20 kt. Slight chance of
showers. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds 10 to 20 kt veering to west
10 to 15 kt. Chance of showers overnight. Waves 2 to 4 ft
subsiding to 1 to 3 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest. Waves 1 to
3 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 1 to 3 ft.
.MONDAY...North winds 10 to 20 kt becoming west. Waves 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 15 kt becoming southwest. Waves
1 to 2 ft.
.TUESDAY...Southwest winds 10 to 20 kt. Waves 1 to 3 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Chance of showers. Waves 3 to 5 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-150930-
Lake Michigan from Michigan City IN to St. Joseph MI 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 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-
850 PM CDT Fri Aug 14 2026

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.REST OF TONIGHT...North winds 10 to 20 kt veering to southeast.
Slight chance of showers and thunderstorms overnight. Waves 2 to
4 ft.
.SATURDAY...Southeast winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 3 to 5 ft.
.SATURDAY NIGHT...Southeast winds 10 to 15 kt veering to west.
Chance of showers overnight. Waves 2 to 4 ft subsiding to 1 to
3 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest. Chance of
showers. Waves 1 to 3 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 1 to 3 ft.
.MONDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 15 kt becoming southwest. Waves
1 to 2 ft.
.TUESDAY...Southwest winds 10 to 20 kt. Waves 1 to 3 ft.
.WEDNESDAY...Northwest winds 15 to 25 kt increasing to 30 kt.
Chance of showers. Waves 3 to 5 ft.

$$

LMZ761-150930-
MAFOR 1504/
MICHIGAN NORTH 11120 12220 11320 12330 12320. Waves 2 to 4 feet
subsiding to 1 to 3 feet overnight. Waves 1 to 3 feet building to
2 to 4 feet Saturday. Waves 1 to 3 feet Saturday evening.

MICHIGAN SOUTH 12220 11320 13330 11320 11310. A chance of showers
late this evening. A chance of showers and thunderstorms
Saturday. Waves 2 to 4 feet subsiding to 1 to 3 feet overnight.
Waves 1 to 3 feet building to 2 to 4 feet Saturday. Waves 2 to 4
feet subsiding to 1 to 3 feet Saturday evening.

$$


Sheppard

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

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