593
FZUS63 KMKX 120835
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
335 AM CDT Mon May 12 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...

Low pressure around 29.9 inches will attempt to advance toward
the western Ohio River Valley today, with winds once again
shifting out of the northeast across the southern open waters.
South southeast winds are expected to continue further north.
Anticipate similar conditions through Tuesday, as the low lingers
near the Ohio River.

Isolated to widely scattered showers and thunderstorms are
possible during the afternoon and early evening hours on both
Monday and Tuesday, ahead of the approaching low. Best chances
for precipitation will be across the southern half of Lake
Michigan each day.

A larger area of low pressure around 29.4 inches will advance
into the northern Great Plains Tuesday night into Wednesday,
resulting in east southeast winds across all of Lake Michigan.
Isolated to widely scattered shower and storm chances will
continue Wednesday afternoon and early evening across all of the
open waters.

The low pressure system will move into the Upper Mississippi
Valley on Thursday, dragging a cold front across Lake Michigan
during the afternoon and evening hours. Chances for more
widespread showers and thunderstorms are expected along and ahead
of the front, with a few stronger storms possible.

A west southwest wind shift is expected behind the front on
Friday. These winds will be gusty, though gales are not
anticipated at this time. Trends will be monitored over the
coming forecasts. Winds will be accompanied by additional areas
of showers and thunderstorms, particularly Friday afternoon and
evening.

LMZ261-362-364-366-563-565-567-868-121515-
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-
335 AM CDT Mon May 12 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 20 kt becoming southwest. Waves 1 to
3 ft.
.TONIGHT...East winds 5 to 10 kt becoming southeast. Waves 1 to
2 ft.
.TUESDAY...Southeast winds 5 to 10 kt backing to northeast 10 to
15 kt. Waves 1 to 2 ft.
.TUESDAY NIGHT...East winds 10 to 20 kt becoming southeast 10 to
15 kt. Waves 1 to 3 ft.
.WEDNESDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 1 to 2 ft.
.WEDNESDAY NIGHT...East winds 10 to 20 kt becoming southeast
10 to 15 kt. Waves 1 to 2 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Waves 2 to 4 ft building
to 3 to 5 ft.
.FRIDAY...Southwest winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-121515-
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-
335 AM CDT Mon May 12 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Southeast winds 10 to 15 kt becoming northeast. Waves
1 to 2 ft.
.TONIGHT...Northeast winds 10 to 15 kt becoming southeast 5 to
10 kt. Chance of showers and slight chance of thunderstorms in
the evening, then slight chance of showers overnight. Waves 1 to
2 ft.
.TUESDAY...East winds 5 to 10 kt becoming northeast. Waves 1 to
2 ft.
.TUESDAY NIGHT...Northeast winds 5 to 10 kt becoming east. Waves
1 ft or less.
.WEDNESDAY...Southeast winds 5 to 10 kt. Chance of showers in the
afternoon. Waves 1 ft or less.
.WEDNESDAY NIGHT...East winds 5 to 10 kt becoming southeast 10 to
15 kt. Waves 1 to 2 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Waves 2 to 4 ft building
to 3 to 5 ft.
.FRIDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Waves
4 to 7 ft occasionally to 9 ft.

$$

LMZ761-121515-
MAFOR 1210/
MICHIGAN NORTH 13420 11510 11310 11200 11210 11310. Waves 2 feet
or less.

MICHIGAN SOUTH 11310 11200 11210 12110 11210 12310. A chance of
showers this evening. Waves 1 foot or less.

$$


DDV

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

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