024
FZUS63 KMKX 151349
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
849 AM CDT Thu May 15 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...

Dense fog is expected at times through this afternoon, as a moist
airmass lingers over the chilly waters of Lake Michigan. The
Dense Fog Advisory covers all open waters of the lake until 7 PM
CDT.

South to southeast winds will increase today, as low pressure
lifts through the Northern Plains while deepening to 28.9 inches.
While breezy at times, winds are expected to remain well below
gale force, due to warmer air over the cold lake. Thunderstorms
will be likely along a cold front this evening. A few strong to
severe storms with large hail will be possible. Winds will turn
southwest behind the front.

Low pressure will then move through northern Minnesota and
northwest Wisconsin Friday, while weakening a bit to around 29.2
inches. Winds will remain southerly over the open waters. Could
see gusts approach gale force over the western shoreline areas,
ahead of the main cold front Friday afternoon. An additional
round of thunderstorms will be possible with this secondary front,
with a few strong to severe storms possible again, especially
across the south half of the lake.

Breezy westerly winds are likely Saturday behind the cold front,
as low pressure passes by to the north. Winds veer north Saturday
night into Sunday, as high pressure builds in north of the region.

LMZ261-362-364-366-563-565-567-868-152130-
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-
849 AM CDT Thu May 15 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

...DENSE FOG ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.REST OF TODAY...East winds 10 to 15 kt increasing to 10 to
20 kt. Areas of dense fog. Waves 1 to 3 ft.
.TONIGHT...East winds to 30 kt veering to southwest 15 to 25 kt.
Patchy dense fog in the evening. Chance of showers and
thunderstorms. Waves 2 to 4 ft.
.FRIDAY...South winds 10 to 20 kt increasing to 30 kt. Waves 2 to
4 ft building to 6 to 9 ft occasionally to 12 ft.
.FRIDAY NIGHT...South winds to 30 kt becoming southwest 10 to
20 kt overnight. Rain showers likely in the evening, then chance
of rain showers overnight. Waves 6 to 9 ft occasionally to 12 ft
subsiding to 4 to 7 ft occasionally to 9 ft.
.SATURDAY...Southwest winds 15 to 25 kt becoming west to 30 kt.
Chance of rain showers in the morning. Waves 3 to 5 ft.
.SATURDAY NIGHT...Northwest winds to 30 kt diminishing to 15 to
25 kt. Waves 3 to 5 ft.
.SUNDAY...North winds 15 to 25 kt. Waves 3 to 5 ft.
.MONDAY...Northeast winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-152130-
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-
849 AM CDT Thu May 15 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...DENSE FOG ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.REST OF TODAY...Southeast winds 10 to 15 kt increasing to 15 to
25 kt. Areas of dense fog. Waves 2 to 4 ft.
.TONIGHT...South winds to 30 kt becoming southwest late in the
evening, then diminishing to 15 to 25 kt after midnight
diminishing to 10 to 20 kt late. Chance of showers and
thunderstorms in the evening. Waves 3 to 5 ft.
.FRIDAY...South winds 10 to 20 kt increasing to 30 kt. Gales are
possible along the western edge of the lake, including nearshore
zones. Waves 2 to 4 ft building to 6 to 9 ft occasionally to 12
ft.
.FRIDAY NIGHT...Southwest winds to 30 kt diminishing to 10 to
20 kt overnight. Chance of showers in the evening. Waves 6 to
9 ft occasionally to 12 ft subsiding to 4 to 6 ft occasionally to
8 ft.
.SATURDAY...West winds 15 to 25 kt. Waves 4 to 6 ft occasionally
to 8 ft.
.SATURDAY NIGHT...Northwest winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.SUNDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 3 to 5 ft.
.MONDAY...Northeast winds 10 to 20 kt. Waves 2 to 4 ft.

$$

LMZ761-152130-
MAFOR 1516/
MICHIGAN NORTH 11324 11220 19224 11230 19234 11346 11436 11530
11420 11440. A chance of thunderstorms tonight. Waves 2 feet or
less this afternoon. Waves 1 to 3 feet tonight. Waves 1 to 3 feet
building to 2 to 4 feet Friday morning.

MICHIGAN SOUTH 11324 11330 19334 11330 11440 11530 11520 11420
11440. A chance of showers and thunderstorms this evening. Waves
1 to 3 feet this afternoon. Waves 2 to 4 feet subsiding to 1 to 3
feet tonight. Waves 1 to 3 feet building to 2 to 4 feet Friday
morning.

$$


Sheppard

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

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