844
FZUS63 KMKX 171946
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
246 PM CDT Thu Apr 17 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...

Breezy south to southeast winds will continue into tonight, as
high pressure slides east of the lake, and low pressure around
29.4 inches moves across the central Great Plains into Iowa. A
few gale force gusts are possible during this period. There are
chances for thunderstorms mainly later tonight.

Modest southerly winds on Friday will then shift northwesterly
late Friday afternoon or evening, with the passage of a cold
front. There are chances for thunderstorms later Friday into
Friday night with the cold front, with hail and strong winds
possible over southern portions of the lake.

Modest northwest winds continue behind the cold front Friday
night, followed by lighter north winds Saturday, as high pressure
around 30.4 inches builds into the Great lakes region.

LMZ261-362-364-366-563-565-567-868-180330-
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-
246 PM CDT Thu Apr 17 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds to 30 kt. Chance of rain showers and
slight chance of thunderstorms this evening, then rain showers
and slight chance of thunderstorms overnight. Waves 6 to 9 ft
occasionally to 12 ft.
.FRIDAY...South winds to 30 kt diminishing to 15 to 25 kt late in
the morning, then becoming southwest early in the afternoon
becoming west 10 to 20 kt late. Chance of rain showers and slight
chance of thunderstorms in the morning, then rain showers likely
with a chance of thunderstorms in the afternoon. Waves 5 to 8 ft
occasionally to 10 ft subsiding to 4 to 6 ft occasionally to
8 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt becoming northwest. Rain
showers likely with a chance of thunderstorms in the evening,
then chance of rain showers overnight. Waves 3 to 5 ft.
.SATURDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft
subsiding to 1 to 3 ft.
.SATURDAY NIGHT...North winds 10 to 20 kt becoming northeast
10 to 15 kt. Waves 1 to 3 ft.
.SUNDAY...East winds 10 to 15 kt becoming northeast 10 to 20 kt.
Waves 1 to 3 ft.
.SUNDAY NIGHT...East winds 10 to 20 kt increasing to 15 to 25 kt.
Chance of rain showers. Waves 2 to 4 ft building to 4 to 6 ft
occasionally to 8 ft.
.MONDAY...East winds 15 to 25 kt becoming northeast to 30 kt.
Rain showers likely. Waves 5 to 8 ft occasionally to 10 ft.
.TUESDAY...Northwest winds 15 to 25 kt becoming southwest 10 to
20 kt. Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-180330-
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-
246 PM CDT Thu Apr 17 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TONIGHT...South winds to 30 kt. Chance of rain showers and
slight chance of thunderstorms this evening, then chance of rain
showers and thunderstorms overnight. Waves 6 to 9 ft occasionally
to 12 ft.
.FRIDAY...South winds to 30 kt. Chance of showers and slight
chance of thunderstorms in the morning, then chance of showers
and thunderstorms in the afternoon. Waves 5 to 8 ft occasionally
to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft.
.FRIDAY NIGHT...Southwest winds to 30 kt becoming west late in
the evening, then becoming northwest 10 to 20 kt overnight. Rain
showers likely with a chance of thunderstorms in the evening,
then chance of rain showers overnight. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.SATURDAY...Northwest winds 10 to 20 kt becoming north. Waves
2 to 4 ft.
.SATURDAY NIGHT...Northeast winds 5 to 10 kt increasing to 10 to
15 kt. Waves 1 to 3 ft.
.SUNDAY...East winds 10 to 20 kt becoming northeast. Chance of
rain showers. Waves 2 to 4 ft.
.SUNDAY NIGHT...East winds 15 to 25 kt becoming southeast. Rain
showers. Waves 3 to 5 ft building to 4 to 7 ft occasionally to
9 ft.
.MONDAY...South winds 15 to 25 kt becoming southwest to 30 kt.
Chance of rain showers. Waves 5 to 8 ft occasionally to 10 ft.
.TUESDAY...West winds 10 to 20 kt backing to southeast 10 to
15 kt. Waves 2 to 4 ft.

$$

LMZ761-180330-
MAFOR 1722/
MICHIGAN NORTH 11340 13446 11440 11430 11436 11536. A chance of
thunderstorms Friday afternoon. Waves 5 to 8 feet building to 6
to 9 feet tonight. Waves 5 to 8 feet subsiding to 3 to 6 feet
Friday.

MICHIGAN SOUTH 13440 11446 14440. A chance of thunderstorms
overnight and Friday afternoon. Waves 5 to 8 feet tonight. Waves
4 to 7 feet subsiding to 3 to 6 feet Friday.

$$
Wood

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

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