116
FZUS63 KMKX 072103
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
403 PM CDT Fri Aug 7 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...

Low pressure of 29.8 inches over Lake Superior along a front will
swing through tonight across the lake. Scattered showers and
storms are possible tonight as this cold front crosses Lake
Michigan. West to northwest winds behind the front early Saturday
will quickly return to southerly by Saturday evening ahead of the
next approaching low pressure system. An unsettled weather pattern
will set up over the Upper Great Lakes next week where weak waves
of low pressure will cross the region and produce rounds of
thunderstorms at times.

LMZ261-362-364-366-563-565-567-868-080300-
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-
403 PM CDT Fri Aug 7 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds 15 to 25 kt becoming west 10 to 20 kt.
Chance of showers and slight chance of thunderstorms. Waves 3 to
5 ft subsiding to 2 to 4 ft.
.SATURDAY...Northwest winds 10 to 20 kt backing to southwest.
Patchy dense fog in the morning. Waves 1 to 3 ft.
.SATURDAY NIGHT...Southwest winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 2 ft.
.SUNDAY...Southwest winds 10 to 20 kt becoming south 15 to 25 kt.
Chance of showers in the afternoon. Waves 2 to 4 ft.
.SUNDAY NIGHT...Southwest winds 10 to 20 kt veering to northwest
5 to 10 kt overnight. Chance of showers. Waves 2 to 4 ft.
.MONDAY...North winds 10 to 20 kt veering to south. Waves 1 to
3 ft.
.MONDAY NIGHT...South winds 10 to 15 kt backing to northeast.
Waves 1 to 2 ft.
.TUESDAY...Northeast winds 10 to 15 kt becoming north. Chance of
showers. Waves 1 to 2 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt becoming west 10 to
20 kt. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-080300-
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-
403 PM CDT Fri Aug 7 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds 15 to 25 kt becoming west 10 to 20 kt.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.SATURDAY...West winds 10 to 20 kt diminishing to 10 to 15 kt.
Waves 1 to 3 ft.
.SATURDAY NIGHT...South winds 5 to 10 kt increasing to 10 to
15 kt. Waves 1 to 2 ft.
.SUNDAY...South winds 10 to 20 kt. Chance of showers. Waves 2 to
4 ft.
.SUNDAY NIGHT...South winds 10 to 20 kt becoming southwest 10 to
15 kt. Showers likely with a chance of thunderstorms. Waves 2 to
4 ft subsiding to 1 to 3 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming south. Chance of
showers and thunderstorms. Waves 1 to 3 ft.
.MONDAY NIGHT...Southeast winds 10 to 20 kt backing to north
10 to 15 kt. Showers likely with a chance of thunderstorms. Waves
1 to 3 ft.
.TUESDAY...Northeast winds 10 to 15 kt becoming north. Chance of
showers. Waves 1 to 3 ft.
.WEDNESDAY...Northeast winds 5 to 10 kt becoming north 10 to
20 kt. Waves 1 ft or less.

$$
LMZ761-080300-
MAFOR 0722 AMD/
MICHIGAN NORTH 12430 11530 11520 12720 11710 11510. A chance of
showers tonight. Waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet Saturday.

MICHIGAN SOUTH 11430 11420 12520 11620 11720 12710. Waves 2 to 4
feet subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet
Saturday.

$$


WFO MKX

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

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