096
FZUS63 KMKX 191402
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
902 AM CDT Wed Aug 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...

A cold front will shift south of Lake Michigan by early this
afternoon. Behind the front, expect mainly light to modest winds
this afternoon into Thursday, as high pressure around 30.0 inches
tracks through the western Great Lakes region. As the high exits
to the east later Thursday into Thursday night, south to
southwest winds will develop. Gusty southwest winds and
thunderstorm chances return later Friday, as low pressure around
29.8 inches moves across the region and drags a cold front
through. Gusty winds will shift to the west Friday night and
northwest on Saturday behind the front.

LMZ261-362-364-366-563-565-567-868-192130-
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-
902 AM CDT Wed Aug 19 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...Northwest winds 5 to 10 kt increasing to 10 to
15 kt late this morning, then increasing to 10 to 20 kt early
this afternoon becoming southwest late. Waves 1 to 2 ft.
.TONIGHT...East winds 10 to 15 kt becoming southeast. Waves 1 to
2 ft subsiding to nearly calm.
.THURSDAY...South winds 5 to 10 kt becoming southwest 10 to 20 kt
early in the afternoon, then becoming south late. Waves 1 to 2 ft
building to 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt. Waves 2 to 4 ft.
.FRIDAY...Southwest winds 15 to 25 kt increasing to 30 kt.
Showers likely in the morning, then chance of showers in the
afternoon. Waves 3 to 5 ft.
.FRIDAY NIGHT...Southwest winds 15 to 25 kt veering to northwest
10 to 20 kt. Chance of showers. Waves 3 to 5 ft subsiding to 2 to
4 ft.
.SATURDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Waves 1 to 3 ft.
.SUNDAY...Northwest winds to 30 kt becoming north gales to 35 kt.
Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-192130-
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-
902 AM CDT Wed Aug 19 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...North winds 5 to 10 kt increasing to 10 to
15 kt. Waves 1 to 3 ft.
.TONIGHT...Northeast winds 10 to 15 kt diminishing to 5 to 10 kt.
Waves 1 to 2 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming east late in the
morning, then veering to south early in the afternoon becoming
10 to 20 kt late. Waves 1 to 3 ft.
.THURSDAY NIGHT...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY...Southwest winds 10 to 20 kt becoming south to 30 kt in
the afternoon. Chance of showers. Waves 3 to 5 ft.
.FRIDAY NIGHT...Southwest winds 15 to 25 kt becoming west 10 to
20 kt. Chance of showers. Waves 3 to 5 ft.
.SATURDAY...Northwest winds 15 to 25 kt becoming north to 30 kt.
Waves 2 to 4 ft.
.SUNDAY...North winds 15 to 25 kt increasing to 30 kt. Waves 4 to
6 ft occasionally to 8 ft.

$$

LMZ761-192130-
MAFOR 1916/
MICHIGAN NORTH 11710 11610 11210 12200 12300 11400. Waves 2 feet
or less.

MICHIGAN SOUTH 11800 11810 12110 13100 11200. Waves 2 feet or
less.

$$
Wood

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

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