356
FZUS63 KMKX 211948
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
248 PM CDT Mon Jul 21 2025

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...

Easterly winds expected today as high pressure around 30.2 inches
exits toward the Hudson Bay. Winds will increase to around 20
knots and become southeast on Tuesday as low pressure around 29.5
inches approaches Minnesota from the Central Plains. There are
chances for storms starting Tuesday night and continuing through
Friday along a frontal boundary. Initially, Tuesday night into
Thursday morning, expect the front to remain stationary across the
northern half of the lake. Thursday afternoon through Friday,
expect the front to push southward, bringing storms southeastward
through the remainder of the open waters. A low pressure trough
around 29.8 inches will drop through the area Thursday night into
Friday, shifting winds to westerly.

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-
248 PM CDT Mon Jul 21 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...Northeast winds 10 to 15 kt veering to south 10 to
20 kt. Waves 1 to 2 ft building to 2 to 4 ft.
.TUESDAY...South winds 10 to 20 kt. Waves 3 to 5 ft.
.TUESDAY NIGHT...South winds 10 to 20 kt. Waves 3 to 5 ft.
.WEDNESDAY...South winds 15 to 25 kt. Chance of showers and
thunderstorms in the morning, then chance of showers in the
afternoon. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 kt diminishing to
10 to 20 kt. Chance of showers. Waves 4 to 6 ft occasionally to
8 ft subsiding to 3 to 5 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Chance of showers in the
morning, then chance of showers and thunderstorms in the
afternoon. Waves 2 to 4 ft.
.THURSDAY NIGHT...West winds 10 to 15 kt becoming northwest 5 to
10 kt. Chance of showers and thunderstorms. Waves 2 to 4 ft.
.FRIDAY...North winds 10 to 15 kt. Waves 1 to 2 ft.
.SATURDAY...East winds 5 to 10 kt veering to south 10 to 15 kt.
Waves 1 ft or less.

$$

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-
248 PM CDT Mon Jul 21 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...Northeast winds 10 to 15 kt becoming east 10 to 20 kt
late this evening, then becoming southeast 15 to 25 kt overnight.
Waves 1 to 2 ft building to 3 to 5 ft.
.TUESDAY...Southeast winds 10 to 20 kt becoming south. Waves 3 to
5 ft.
.TUESDAY NIGHT...Southeast winds 10 to 20 kt becoming south.
Waves 3 to 5 ft.
.WEDNESDAY...South winds 15 to 25 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY NIGHT...South winds 10 to 20 kt becoming southwest.
Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.
.THURSDAY...Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 10 to 20 kt becoming west 10 to
15 kt. Showers likely with a chance of thunderstorms. Waves 2 to
4 ft.
.FRIDAY...West winds 10 to 15 kt becoming north. Chance of
showers. Waves 1 to 2 ft.
.SATURDAY...Northeast winds 5 to 10 kt veering to south 10 to
15 kt. Waves 1 to 2 ft.

$$

LMZ761-220315-
MAFOR 2122/
MICHIGAN NORTH 11110 11210 12320 14420. Waves 2 feet or less
building to 2 to 4 feet tonight. Waves 2 to 4 feet Tuesday.

MICHIGAN SOUTH 11110 11120 11220 11330 12320 12420. Waves 1 to 3
feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Tuesday.

$$


Wagner

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

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