401
FZUS63 KMKX 140159
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
859 PM CDT Wed Aug 13 2025

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...

High pressure around 30.2 inches will remain dominant over
Ontario through Thursday, resulting in light and variable winds
over the lake. The high will drift further east later this week,
as a surface pressure trough deepens over the Rockies and High
Plains. This will allow 10 to 20 knot southerly winds to develop
Friday. Chances for showers and thunderstorms return Saturday
through the first half of next week, as a cold front slowly sags
southward across the lake and stalls somewhere nearby.

LMZ261-362-364-366-563-565-567-868-140915-
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-
859 PM CDT Wed Aug 13 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Northeast winds 10 to 15 kt diminishing to
5 to 10 kt. Areas of smoke through early evening. Waves 1 to
2 ft.
.THURSDAY...Northeast winds 5 to 10 kt. Waves 1 to 2 ft.
.THURSDAY NIGHT...East winds 5 to 10 kt veering to south 10 to
15 kt. Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 1 to 3 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt becoming southwest. Waves
1 to 3 ft.
.SATURDAY...Southwest winds 10 to 20 kt. Chance of showers. Waves
1 to 3 ft.
.SATURDAY NIGHT...West winds 10 to 20 kt veering to north 10 to
15 kt. Chance of showers and thunderstorms. Waves 1 to 3 ft.
.SUNDAY...Northeast winds 10 to 20 kt. Waves 2 to 4 ft.
.MONDAY...Southeast winds 10 to 20 kt. Chance of showers and
thunderstorms. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-140915-
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-
859 PM CDT Wed Aug 13 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...North winds 5 to 10 kt becoming northeast.
Areas of smoke overnight. Waves 1 to 3 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming north. Areas of
smoke in the morning. Waves 1 to 2 ft.
.THURSDAY NIGHT...Northeast winds 5 to 10 kt veering to
southeast. Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.FRIDAY NIGHT...South winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 1 to 3 ft.
.SATURDAY...Southwest winds 10 to 20 kt becoming south. Chance of
showers in the morning. Waves 1 to 3 ft.
.SATURDAY NIGHT...South winds 10 to 15 kt becoming west. Chance
of showers and thunderstorms. Waves 1 to 3 ft.
.SUNDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft.
.MONDAY...Southeast winds 10 to 20 kt. Chance of showers. Waves
2 to 4 ft.

$$

LMZ761-140915-
MAFOR 1404/
MICHIGAN NORTH 11110 13100 11200 11100 11200 11210. Waves 1 foot
or less.

MICHIGAN SOUTH 16100. 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