173
FZUS63 KMKX 211943
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
243 PM CDT Thu May 21 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...

High pressure of 30.4 inches centered over Lake Superior will
will gradually shift eastward through the end of the week.
Persistent east to northeast winds of 10 to 20 knots are expected
through Friday, with winds becoming northerly on Saturday as low
pressure of 29.8 inches over far southern Illinois lifts into
southern Michigan. Winds should increase a bit Friday afternoon
into Saturday, though winds will remain below gale force.
Southerly winds are then expected to develop early next week.

LMZ261-362-364-366-563-565-567-868-220315-
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-
243 PM CDT Thu May 21 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northeast winds 15 to 25 kt becoming east 10 to 20 kt.
Waves 2 to 4 ft.
.FRIDAY...East winds 10 to 20 kt becoming northeast to 30 kt.
Waves 1 to 3 ft building to 4 to 6 ft occasionally to 8 ft.
.FRIDAY NIGHT...East winds to 30 kt. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 3 to 5 ft.
.SATURDAY...East winds to 30 kt becoming northeast. Chance of
showers. Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...Northeast winds to 30 kt veering to south 10 to
15 kt overnight. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.SUNDAY...South winds 5 to 10 kt becoming southwest 10 to 15 kt.
Waves 1 to 2 ft.
.SUNDAY NIGHT...South winds 10 to 15 kt diminishing to 5 to
10 kt. Waves 1 ft or less.
.MONDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.TUESDAY...South winds 10 to 15 kt becoming southwest. Waves 1 to
2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-220315-
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-
243 PM CDT Thu May 21 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northeast winds 15 to 25 kt becoming east. Waves 3 to
5 ft.
.FRIDAY...East winds 15 to 25 kt becoming northeast. Waves 3 to
5 ft.
.FRIDAY NIGHT...East winds 15 to 25 kt. Chance of showers
overnight. Waves 4 to 6 ft occasionally to 8 ft.
.SATURDAY...Northeast winds 15 to 25 kt becoming north 10 to
20 kt. Chance of showers in the morning. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.SATURDAY NIGHT...North winds 10 to 15 kt veering to south. Waves
1 to 3 ft.
.SUNDAY...South winds 5 to 10 kt. Waves 1 ft or less.
.SUNDAY NIGHT...Southeast winds 5 to 10 kt becoming south. Waves
1 ft or less.
.MONDAY...South winds 5 to 10 kt becoming southeast. Waves 1 to
2 ft.
.TUESDAY...South winds 5 to 10 kt becoming southeast. Waves 1 to
2 ft.

$$

LMZ761-220315-
MAFOR 2122/
MICHIGAN NORTH 11130 11230 14220 11130 11140. Waves 1 to 3 feet
tonight. Waves 1 to 3 feet building to 3 to 5 feet Friday.

MICHIGAN SOUTH 12130 13230 11220 12130. Waves 2 to 4 feet building
to 3 to 5 feet Friday.


$$


Cronce

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

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