655
FZUS63 KMKX 190147
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
847 PM CDT Mon May 18 2026

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...

A Dense Fog Advisory is in effect tonight through Tuesday morning
for the north half of the lake as relatively mild and humid air
flows over the cold lake waters. Otherwise modest to breezy
southerly winds will develop tonight and last into early Tuesday
afternoon, then followed by the passage of a cold front. Winds
will shift to northwesterly with the cold frontal passage and
remain a bit breezy. Scattered thunderstorms can be expected over
the central and southern portion of the lake late tonight into
Tuesday. High pressure around 30.4 inches will then move into
the northern Great Lakes for Wednesday afternoon into Thursday.
Light to modest north to northeast winds can be expected.


LMZ261-362-364-366-563-565-567-868-190915-
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-
847 PM CDT Mon May 18 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

...DENSE FOG ADVISORY IN EFFECT UNTIL NOON CDT TUESDAY...

.REST OF TONIGHT...South winds 10 to 20 kt increasing to 30 kt.
Widespread dense fog. Slight chance of rain showers through early
evening, then chance of rain showers and thunderstorms overnight.
Waves 4 to 7 ft occasionally to 9 ft.
.TUESDAY...South winds to 30 kt becoming west. Widespread dense
fog in the morning, then patchy fog in the afternoon. Slight
chance of showers and thunderstorms in the morning, then chance
of showers in the afternoon. Waves 4 to 7 ft occasionally to 9 ft
subsiding to 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...Northwest winds 15 to 25 kt. Waves 3 to 5 ft.
.WEDNESDAY...North winds 15 to 25 kt. Waves 2 to 4 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 kt diminishing to
10 to 15 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.THURSDAY...East winds 5 to 10 kt becoming northeast 10 to 20 kt
in the afternoon. Waves 1 to 2 ft.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt becoming east.
Waves 1 to 3 ft.
.FRIDAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt.
Waves 2 to 4 ft.
.SATURDAY...Northeast winds 15 to 25 kt. Chance of rain showers.
Waves 3 to 5 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-190915-
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-
847 PM CDT Mon May 18 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 15 to 25 kt increasing to 30 kt.
Slight chance of showers through early evening, then chance of
showers and thunderstorms overnight. Patchy fog overnight. Waves
4 to 7 ft occasionally to 9 ft.
.TUESDAY...South winds to 30 kt becoming west 15 to 25 kt. Patchy
fog in the morning. Slight chance of showers and thunderstorms in
the morning, then chance of showers and slight chance of
thunderstorms in the afternoon. Waves 4 to 7 ft occasionally to
9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...Northwest winds 10 to 20 kt becoming north.
Waves 3 to 5 ft.
.WEDNESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 kt diminishing to
10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to
3 to 5 ft.
.THURSDAY...East winds 10 to 20 kt becoming northeast. Waves 2 to
4 ft.
.THURSDAY NIGHT...Northeast winds 10 to 20 kt becoming east.
Waves 2 to 4 ft.
.FRIDAY...East winds 10 to 20 kt becoming northeast. Chance of
showers. Waves 2 to 4 ft.
.SATURDAY...Northeast winds 10 to 20 kt becoming north 10 to
15 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft.

$$

LMZ761-190915-
MAFOR 1904/
MICHIGAN NORTH 11434 11444 11446 19444 11444 12540 12730. Waves 2
to 4 feet building to 3 to 6 feet overnight. Waves 3 to 6 feet
Tuesday. Waves 3 to 5 feet subsiding to 2 to 4 feet Tuesday
evening.

MICHIGAN SOUTH 11430 13440 12530 12720. A chance of showers and
thunderstorms overnight. A chance of showers Tuesday afternoon.
Waves 3 to 6 feet overnight and Tuesday. Waves 2 to 4 feet
Tuesday evening.

$$


Gehring

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

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