166
FZUS63 KMKX 192046
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
346 PM CDT Sat Sep 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...

Low pressure around 29.8 inches over central Iowa will track to
east central Illinois by Sunday morning, then settle over the
southern Ohio Valley for next week. Meanwhile, high pressure
around 30.3 inches over Manitoba will strengthen and track across
Ontario for Sunday and Monday, then to Quebec for Tuesday and
Wednesday. Modest east winds tonight will become breezy east to
northeast winds Sunday through Wednesday with the highest winds
over the south half.

LMZ261-362-364-366-563-565-567-868-200315-
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-
346 PM CDT Sat Sep 19 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...East winds 10 to 20 kt becoming northeast. Scattered
showers this evening. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.SUNDAY...Northeast winds 15 to 25 kt increasing to 30 kt. Waves
4 to 6 ft occasionally to 8 ft building to 6 to 9 ft occasionally
to 12 ft.
.SUNDAY NIGHT...Northeast winds to 30 kt diminishing to 15 to
25 kt after midnight, then becoming east 10 to 20 kt late. Waves
7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft
occasionally to 9 ft.
.MONDAY...East winds 15 to 25 kt becoming northeast. Waves 4 to
6 ft occasionally to 8 ft.
.MONDAY NIGHT...East winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.TUESDAY...East winds 15 to 25 kt becoming northeast to 30 kt.
Waves 3 to 5 ft.
.TUESDAY NIGHT...East winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...East winds 15 to 25 kt becoming northeast to 30 kt.
Waves 3 to 5 ft.
.THURSDAY...East winds 10 to 20 kt becoming northeast. Waves 1 to
3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-200315-
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-
346 PM CDT Sat Sep 19 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...East winds 10 to 15 kt becoming northeast 10 to 20 kt.
Scattered showers with a chance of thunderstorms this evening,
then showers with a chance of thunderstorms overnight. Waves 3 to
5 ft.
.SUNDAY...Northeast winds 15 to 25 kt increasing to 30 kt.
Scattered showers. Waves 4 to 6 ft occasionally to 8 ft building
to 7 to 10 ft occasionally to 13 ft.
.SUNDAY NIGHT...Northeast winds to 30 kt becoming east. Waves
8 to 12 ft occasionally to 16 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.MONDAY...East winds to 30 kt becoming northeast. Waves 7 to
10 ft occasionally to 13 ft.
.MONDAY NIGHT...East winds to 30 kt. Waves 6 to 9 ft occasionally
to 12 ft.
.TUESDAY...East winds to 30 kt becoming northeast. Waves 7 to
10 ft occasionally to 13 ft.
.TUESDAY NIGHT...Northeast winds to 30 kt becoming east 15 to
25 kt. Waves 6 to 9 ft occasionally to 12 ft.
.WEDNESDAY...Northeast winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.THURSDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 3 to 5 ft.

$$

LMZ761-200315-
MAFOR 1922/
MICHIGAN NORTH 11220 19226 11210 19216 11110 11120 13130 11140.
Waves 2 to 4 feet subsiding to 1 to 3 feet, then building to 2 to
4 feet tonight. Waves 3 to 5 feet building to 6 to 9 feet Sunday.

MICHIGAN SOUTH 12210 19216 11216 11126 12136 11130 19136 11140
19146. Waves 3 to 5 feet subsiding to 1 to 3 feet, then building
to 2 to 4 feet tonight. Waves 3 to 6 feet building to 6 to 9 feet
Sunday.

$$


Gehring

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

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