836
FZUS63 KMKX 131400
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
900 AM CDT Sun Sep 13 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...

Light to moderate northwest winds will prevail through today with
occasional gusts to 25 knots over the lake this afternoon. Winds
ease tonight as high pressure around 30.3 inches moves across the
lake into Monday morning.

Winds will then increase and veer to south-southwesterly Monday
afternoon into Tuesday as low pressure around 29.4 inches
develops over Manitoba. Gales appear likely Monday night into the
first half of Tuesday. A Gale Watch has been issued for the
northern two thirds of the open waters of Lake Michigan.

Periods of showers and thunderstorms will accompany the
developing low from as early as Monday evening into Tuesday. Winds
will trend northerly and weaken behind a cold front Tuesday night
into Wednesday.

LMZ261-362-364-366-563-565-567-868-132115-
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-
900 AM CDT Sun Sep 13 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.REST OF TODAY...Northwest winds 10 to 20 kt increasing to 15 to
25 kt. Isolated showers through mid morning. Waves 3 to 5 ft.
.TONIGHT...Northwest winds 15 to 25 kt becoming north 10 to
15 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.MONDAY...North winds 5 to 10 kt veering to east late in the
morning, then becoming south 10 to 20 kt early in the afternoon
increasing to 15 to 25 kt late. Waves 1 to 2 ft building to 4 to
6 ft occasionally to 8 ft.
.MONDAY NIGHT...South gales to 40 kt. Chance of showers in the
evening, then showers overnight. Waves 8 to 12 ft occasionally to
16 ft building to 12 to 16 ft occasionally to 21 ft.
.TUESDAY...Southwest gales to 40 kt diminishing to 30 kt in the
afternoon. Showers in the morning, then chance of showers in the
afternoon. Waves 12 to 16 ft occasionally to 21 ft subsiding to
8 to 11 ft occasionally to 14 ft.
.TUESDAY NIGHT...Northwest winds 15 to 25 kt becoming north 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 2 to 4 ft.
.THURSDAY...East winds 10 to 20 kt becoming northeast. Chance of
showers. Waves 2 to 4 ft.

$$

LMZ669-671-673-675-870-872-874-876-132115-
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 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-
900 AM CDT Sun Sep 13 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH TO WINTHROP HARBOR IL TO SOUTH
HAVEN MI...

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.REST OF TODAY...North winds 10 to 20 kt becoming northwest 15 to
25 kt. Scattered showers this afternoon. Waves 4 to 6 ft
occasionally to 8 ft.
.TONIGHT...Northwest winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.MONDAY...East winds 10 to 15 kt becoming southeast late in the
morning, then increasing to 10 to 20 kt early in the afternoon
increasing to 15 to 25 kt late. Waves 1 to 3 ft building to 4 to
7 ft occasionally to 9 ft.
.MONDAY NIGHT...Southeast gales to 40 kt becoming south. Showers
likely with a chance of thunderstorms overnight. Waves 8 to 12 ft
occasionally to 16 ft building to 12 to 16 ft occasionally to
21 ft.
.TUESDAY...Southwest gales to 35 kt diminishing to 30 kt. Showers
likely in the morning, then chance of showers in the afternoon.
Waves 12 to 16 ft occasionally to 21 ft subsiding to 8 to 11 ft
occasionally to 14 ft.
.TUESDAY NIGHT...Northwest winds 10 to 15 kt becoming north 10 to
20 kt. Chance of showers. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Chance of showers. Waves 2 to 4 ft.
.THURSDAY...East winds 10 to 20 kt becoming northeast. Chance of
showers. Waves 2 to 4 ft.

$$

LMZ080-777-779-878-132115-
Lake Michigan from Michigan City IN to St. Joseph MI 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 St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
900 AM CDT Sun Sep 13 2026

WINTHROP HARBOR IL TO SOUTH HAVEN MI SOUTH...

.REST OF TODAY...North winds 10 to 15 kt becoming northwest 15 to
25 kt, then diminishing to 10 to 20 kt late. Scattered showers
this afternoon. Waves 3 to 5 ft building to 4 to 6 ft
occasionally to 8 ft.
.TONIGHT...Northwest winds 10 to 20 kt becoming north 10 to
15 kt, then diminishing to 5 to 10 kt late. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.MONDAY...East winds 5 to 10 kt becoming southeast 10 to 15 kt,
then increasing to 10 to 20 kt late. Waves 2 to 4 ft.
.MONDAY NIGHT...Southeast winds to 30 kt becoming south. Waves
6 to 9 ft occasionally to 12 ft building to 7 to 10 ft
occasionally to 13 ft.
.TUESDAY...South winds to 30 kt becoming southwest 10 to 20 kt in
the afternoon. Chance of showers in the morning, then showers
likely in the afternoon. Waves 7 to 10 ft occasionally to 13 ft
subsiding to 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...Northwest winds 5 to 10 kt becoming north 10 to
15 kt. Chance of showers. Waves 2 to 4 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt. Chance of showers.
Waves 2 to 4 ft.
.THURSDAY...Southeast winds 10 to 15 kt backing to northwest.
Showers likely. Waves 1 to 3 ft.

$$

LMZ761-132115-
MAFOR 1316/
MICHIGAN NORTH 14730 11820 11810 11800 11200. Waves 2 to 4 feet
building to 3 to 5 feet this afternoon. Waves 2 to 4 feet
subsiding to 1 to 3 feet tonight. Waves 2 feet or less Monday
morning.

MICHIGAN SOUTH 12730 19736 12720 12810 11110 11310. Waves 3 to 6
feet this afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet
tonight. Waves 1 to 3 feet Monday morning.

$$


Gehring

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

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