712
FZUS63 KMKX 160802
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
302 AM CDT Sun Aug 16 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 around 29.9 inches over Ontario will move northeast
toward James Bay through this morning dragging a cold front across
Lake Michigan through the day. Southeast winds ahead of the front
will turn to northwesterly and become breezy behind the frontal
passage. Then high pressure around 30.1 inches will build across
the region from the Plains later tonight into Monday. This will
bring light and variable winds over the Lake through Monday. As
the high pressure moves out, expect southwesterly winds to
increase over Lake Michigan later Monday into Tuesday as a low
pressure around 29.5 inches develops and meanders over the Hudson
Bay region Tuesday. This is expected to drag a slow moving cold
front across the Upper Great Lakes later Tuesday into early
Wednesday and bring thunderstorm chances back to the region. The
front is progged to push through by Wednesday with high pressure
building back into the region for the second half of the week
along with light and variable winds.


LMZ261-362-364-366-563-565-567-868-161545-
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-
302 AM CDT Sun Aug 16 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt
late this morning, then becoming west early this afternoon
becoming north 15 to 25 kt late. Chance of showers and slight
chance of thunderstorms this morning, then slight chance of
showers this afternoon. Waves 1 to 2 ft building to 2 to 4 ft.
.TONIGHT...North winds 15 to 25 kt becoming northwest 10 to
15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.MONDAY...Northwest winds 10 to 15 kt backing to southwest 10 to
20 kt. Waves 1 to 3 ft.
.MONDAY NIGHT...South winds 10 to 20 kt becoming southwest. Waves
2 to 4 ft.
.TUESDAY...Southwest winds 15 to 25 kt. Waves 2 to 4 ft.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt becoming north.
Waves 2 to 4 ft.
.WEDNESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 3 ft.
.THURSDAY...West winds 5 to 10 kt becoming southwest 10 to 20 kt.
Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-161545-
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-
302 AM CDT Sun Aug 16 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southwest winds 10 to 15 kt becoming northwest 10 to
20 kt. Slight chance of showers and thunderstorms. Waves 1 to
2 ft.
.TONIGHT...Northwest winds 10 to 20 kt becoming north. Waves 2 to
4 ft.
.MONDAY...North winds 10 to 15 kt backing to west 10 to 20 kt.
Waves 2 to 4 ft subsiding to 1 to 2 ft.
.MONDAY NIGHT...Southwest winds 10 to 20 kt. Waves 1 to 3 ft
building to 2 to 4 ft.
.TUESDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.TUESDAY NIGHT...Southwest winds 10 to 20 kt becoming northwest.
Chance of showers and thunderstorms. Waves 2 to 4 ft.
.WEDNESDAY...North winds 10 to 20 kt increasing to 30 kt. Chance
of showers. Waves 2 to 4 ft.
.THURSDAY...Southwest winds 5 to 10 kt becoming south 10 to
15 kt. Waves 1 to 2 ft.

$$

LMZ761-161545-
MAFOR 1610/
MICHIGAN NORTH 11410 11510 11620 11730 12830 11820 11710. A
chance of showers this morning. Waves 1 to 3 feet today. Waves 2
to 4 feet subsiding to 1 to 3 feet tonight.

MICHIGAN SOUTH 11510 13610 11710 12820 11810. A chance of showers
early this morning. Waves 2 feet or less today. Waves 1 to 3 feet
tonight.

$$


Wagner

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

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