892
FZUS63 KMKX 172006
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
306 PM CDT Fri Oct 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...

Southerly winds up to 30 knots will linger through the start of
the evening, but will gradually ease across Lake Michigan tonight
as a cold front extending off of a low pressure around 29.3 inch
works its way across Manitoba/western Ontario tonight. The cold
front will push across the lake overnight into Saturday morning
with a westerly winds shift behind the front. Another low pressure
is expected to move in from the Plains across IL and northern IN
Saturday night then rapidly deepen to around 29.2 inches as it
lifts into the Lower Michigan Sunday morning. by midday Sunday it
looks to move toward Lake Huron. This will drag a much stronger
cold front across the lake with a tighter pressure gradient
resulting in gales Sunday morning into Sunday evening. Winds
briefly weaken for Monday, but additional gales will be possible
on Tuesday as another deepening low pressure moves through the
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-
306 PM CDT Fri Oct 17 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.TONIGHT...South winds to 30 kt becoming southwest. Chance of
showers and slight chance of thunderstorms this evening, then
showers likely with slight chance of thunderstorms overnight.
Waves 8 to 11 ft occasionally to 14 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.SATURDAY...Southwest winds 15 to 25 kt becoming south 10 to
20 kt. Chance of showers and slight chance of thunderstorms in
the morning. Waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 6 ft occasionally to 8 ft.
.SATURDAY NIGHT...South winds 10 to 15 kt diminishing to 5 to
10 kt late in the evening, then increasing to 10 to 20 kt after
midnight backing to north to 30 kt late. Chance of showers in the
evening, then showers overnight. Waves 3 to 5 ft building to 4 to
6 ft occasionally to 8 ft.
.SUNDAY...North gales to 35 kt becoming northwest gales to 40 kt.
Showers likely in the morning, then chance of showers in the
afternoon. Waves 8 to 12 ft occasionally to 16 ft.
.SUNDAY NIGHT...Northwest gales to 40 kt diminishing to 15 to
25 kt overnight. Waves 8 to 11 ft occasionally to 14 ft subsiding
to 5 to 8 ft occasionally to 10 ft.
.MONDAY...Southwest winds 15 to 25 kt becoming south to 30 kt.
Waves 3 to 5 ft building to 6 to 9 ft occasionally to 12 ft.
.MONDAY NIGHT...South winds to 30 kt becoming west gales to
35 kt. Showers likely. Waves 7 to 10 ft occasionally to 13 ft.
.TUESDAY...West gales to 40 kt. Showers likely. Waves 7 to 10 ft
occasionally to 13 ft.
.WEDNESDAY...Northwest winds to 30 kt diminishing to 15 to 25 kt.
Chance of rain showers. Waves 5 to 8 ft occasionally to 10 ft
subsiding to 4 to 6 ft occasionally to 8 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-
306 PM CDT Fri Oct 17 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.TONIGHT...South winds to 30 kt. Chance of thunderstorms and
slight chance of showers overnight. Waves 7 to 10 ft occasionally
to 13 ft subsiding to 6 to 9 ft occasionally to 12 ft.
.SATURDAY...Southwest winds to 30 kt diminishing to 15 to 25 kt.
Chance of showers and thunderstorms in the morning, then chance
of showers and slight chance of thunderstorms in the afternoon.
Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to 6 ft
occasionally to 8 ft.
.SATURDAY NIGHT...South winds 10 to 20 kt diminishing to 10 to
15 kt late in the evening, then becoming southwest 10 to 20 kt
after midnight veering to northwest to 30 kt late. Showers likely
with a chance of thunderstorms in the evening, then showers
overnight. Waves 3 to 5 ft building to 5 to 8 ft occasionally to
10 ft.
.SUNDAY...Northwest gales to 45 kt. Showers in the morning, then
chance of showers in the afternoon. Waves 14 to 18 ft
occasionally to 23 ft.
.SUNDAY NIGHT...Northwest gales to 40 kt becoming west to 30 kt
overnight. Waves 12 to 16 ft occasionally to 21 ft subsiding to
8 to 11 ft occasionally to 14 ft.
.MONDAY...Southwest winds to 30 kt becoming south. Waves 4 to
7 ft occasionally to 9 ft building to 7 to 10 ft occasionally to
13 ft.
.MONDAY NIGHT...Southwest winds to 30 kt becoming west gales to
35 kt. Chance of showers. Waves 7 to 10 ft occasionally to 13 ft.
.TUESDAY...West gales to 40 kt increasing to gales to 45 kt.
Chance of showers. Waves 10 to 14 ft occasionally to 18 ft.
.WEDNESDAY...Northwest winds to 30 kt diminishing to 15 to 25 kt.
Waves 7 to 10 ft occasionally to 13 ft subsiding to 5 to 8 ft
occasionally to 10 ft.

$$

LMZ761-180330-
MAFOR 1722/
MICHIGAN NORTH 13440 11546 12530 12520. Waves 6 to 10 feet
tonight. Waves 5 to 8 feet subsiding to 3 to 6 feet Saturday.

MICHIGAN SOUTH 13440 12446 12530 11536. A chance of thunderstorms
overnight and Saturday morning. Waves 6 to 10 feet tonight. Waves
5 to 8 feet subsiding to 3 to 6 feet Saturday.

$$


Wagner

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

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