483
FZUS63 KMKX 190759
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
259 AM CDT Tue Aug 19 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...

Weak low pressure around 29.9 inches will cross southern Lower
Michigan on today. High pressure around 30.1 inches sitting over
Ontario will remain in place through much of the week. A period of
elevated northerly winds is expected today, then light and
variable winds will develop as the high glides over Lake Michigan
later in the week.

LMZ261-362-364-366-563-565-567-868-191530-
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-
259 AM CDT Tue Aug 19 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...East winds 10 to 20 kt becoming northeast. Slight chance
of showers this morning. Waves 2 to 4 ft.
.TONIGHT...Northeast winds 10 to 20 kt becoming north 10 to
15 kt. Slight chance of showers overnight. Waves 2 to 4 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt becoming north. Chance
of showers in the morning. Waves 2 to 4 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt diminishing to
10 to 15 kt. Waves 2 to 4 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Waves 1 to 2 ft.
.THURSDAY NIGHT...East winds 10 to 15 kt veering to south 5 to
10 kt. Waves 1 to 2 ft.
.FRIDAY...Southwest winds 10 to 20 kt. Waves 1 to 2 ft.
.SATURDAY...West winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-191530-
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-
259 AM CDT Tue Aug 19 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northwest winds 10 to 20 kt becoming north. Chance of
showers and slight chance of thunderstorms this morning. Waves
3 to 5 ft.
.TONIGHT...North winds 10 to 20 kt. Slight chance of showers
overnight. Waves 3 to 5 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt becoming north. Waves
3 to 5 ft.
.WEDNESDAY NIGHT...North winds 10 to 20 kt becoming east. Waves
4 to 6 ft occasionally to 8 ft.
.THURSDAY...Northeast winds 10 to 15 kt becoming north 10 to
20 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.THURSDAY NIGHT...Northeast winds 10 to 20 kt becoming east 5 to
10 kt. Waves 1 to 3 ft.
.FRIDAY...South winds 5 to 10 kt increasing to 10 to 15 kt. Waves
1 to 2 ft.
.SATURDAY...Northwest winds 10 to 20 kt becoming west. Waves 2 to
4 ft.

$$

LMZ761-191530-
MAFOR 1910/
MICHIGAN NORTH 11220 14120 11120 12110. A chance of showers early
this morning. Waves 1 to 3 feet.

MICHIGAN SOUTH 11620 11720 14820 11820 11810. A chance of showers
this morning. Waves 2 to 4 feet.

$$


Kuroski

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

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