905
FZUS63 KMKX 131950
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
250 PM CDT Thu Aug 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...

Multiple rounds of storms are expected to cross the southern
portion of Lake Michigan into this weekend due to a front that
remains in place south of the lake. Low pressure of 29.7 inches
over Kansas will track to the northeast and east toward southern
Lake Michigan into Friday night and Saturday. This low should help
to bump up winds and waves across the southern two thirds of Lake
Michigan into Saturday. Beyond this system, a broad ridge of high
pressure of 30.1 inches will push into the Great Lakes early next
week before another potential front moves through the region.

LMZ261-362-364-563-140315-
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 Rock Island Passage to Sturgeon Bay WI-
250 PM CDT Thu Aug 13 2026

STURGEON BAY WI TO POINT BETSIE MI NORTH...

.TONIGHT...North winds 5 to 10 kt becoming northeast. Waves 1 ft
or less.
.FRIDAY...Northeast winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.FRIDAY NIGHT...Northeast winds 10 to 20 kt becoming east 10 to
15 kt. Waves 1 to 2 ft.
.SATURDAY...Southeast winds 10 to 20 kt. Chance of showers. Waves
1 to 3 ft.
.SATURDAY NIGHT...Southeast winds 10 to 20 kt veering to
southwest. Chance of showers. Waves 2 to 4 ft.
.SUNDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of showers in the morning. Waves 1 to 3 ft.
.SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to
15 kt. Waves 1 to 3 ft.
.MONDAY...Northwest winds 10 to 15 kt becoming west 10 to 20 kt.
Waves 1 to 2 ft.
.TUESDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
2 to 4 ft.

$$

LMZ366-565-567-669-868-870-140315-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
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 Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
250 PM CDT Thu Aug 13 2026

STURGEON BAY WI TO POINT BETSIE MI SOUTH TO PORT WASHINGTON WI TO
WHITEHALL MI...

.TONIGHT...Northeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 to 2 ft.
.FRIDAY...Northeast winds 10 to 15 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.FRIDAY NIGHT...Northeast winds 10 to 20 kt veering to southeast.
Chance of showers overnight. Waves 3 to 5 ft.
.SATURDAY...Southeast winds to 30 kt. Chance of showers in the
morning, then showers likely in the afternoon. Waves 4 to 7 ft
occasionally to 9 ft.
.SATURDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Showers likely in the evening, then chance of showers overnight.
Waves 3 to 5 ft subsiding to 2 to 4 ft.
.SUNDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to
4 ft.
.SUNDAY NIGHT...North winds 10 to 20 kt. Waves 1 to 3 ft.
.MONDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 3 ft.

$$

LMZ080-671-673-675-777-779-872-874-876-878-140315-
Lake Michigan from Michigan City IN to St. Joseph MI 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 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-
250 PM CDT Thu Aug 13 2026

PORT WASHINGTON WI TO WHITEHALL MI SOUTH...

.TONIGHT...Northeast winds 10 to 15 kt becoming east. Chance of
rain. Waves 1 to 2 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast 10 to 20 kt.
Slight chance of rain in the morning. Waves 1 to 3 ft.
.FRIDAY NIGHT...Northeast winds 10 to 20 kt veering to southeast.
Chance of showers overnight. Waves 3 to 5 ft.
.SATURDAY...Southeast winds 15 to 25 kt. Showers in the morning,
then showers likely with a chance of thunderstorms in the
afternoon. Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Showers likely with a chance of thunderstorms in the evening,
then chance of showers overnight. Waves 2 to 4 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest. Waves 2 to
4 ft.
.SUNDAY NIGHT...North winds 10 to 15 kt increasing to 10 to
20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.MONDAY...North winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft.
.TUESDAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.

$$

LMZ761-140315-
MAFOR 1322/
MICHIGAN NORTH 11110 12100 13110 11120 11130. Waves 1 foot or
less tonight. Waves 1 to 3 feet Friday.

MICHIGAN SOUTH 13110 13210 11120 11130. A chance of rain tonight.
Waves 2 feet or less tonight. Waves 1 to 3 feet Friday.

$$


Halbach

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

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