FZUS53 KGRB 120556
NSHGRB

Nearshore Marine Forecast
National Weather Service Green Bay WI
1256 AM CDT Tue May 12 2026

For waters within five nautical miles of shore on Lake Michigan

LMZ521-522-121000-
Green Bay south of line from Cedar River to Rock Island Passage
and north of a line from Oconto WI to Little Sturgeon Bay WI-
Green Bay south of line from Oconto WI to Little Sturgeon Bay WI-
1256 AM CDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 7 AM CDT THIS MORNING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THE NIGHT...S wind 10 to 15 kts. Waves 2 ft or less. A
chance of showers after midnight.
.TUESDAY...S wind 15 to 25 kts decreasing to 10 to 15 kts early
in the afternoon. Gusts to 35 kts. Waves 3 to 5 ft. Rain showers
likely in the morning, then a chance of showers and a slight
chance of thunderstorms in the afternoon.
.TUESDAY NIGHT...NW wind 10 to 20 kts increasing to 15 to 25 kts
after midnight. Waves 2 ft or less building to 2 to 4 ft after
midnight. A chance of showers in the evening.
.WEDNESDAY...NW wind 15 to 25 kts veering N 10 to 15 kts early in
the afternoon. Waves 2 to 4 ft. Partly sunny.

$$

LMZ541-121000-
Rock Island Passage to Sturgeon Bay WI-
1256 AM CDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 7 AM CDT THIS MORNING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THE NIGHT...S wind 10 to 15 kts. Waves 2 ft or less. A
chance of showers after midnight.
.TUESDAY...S wind to 30 kts with gale force gusts to around
35 kts. Waves 5 to 8 ft building to 6 to 10 ft in the afternoon.
Rain showers in the morning, then a chance of showers and a
slight chance of thunderstorms in the afternoon.
.TUESDAY NIGHT...W wind 10 to 15 kts veering NW 10 to 20 kts,
then increasing to to 30 kts after midnight. Waves 6 to 10 ft. A
chance of showers in the evening.
.WEDNESDAY...NW wind to 30 kts becoming N 10 to 20 kts early in
the afternoon. Waves 3 to 5 ft subsiding to 2 to 4 ft in the
afternoon. Mostly cloudy in the morning then becoming partly
cloudy.

$$

LMZ542-543-121000-
Sturgeon Bay to Two Rivers WI-Two Rivers to Sheboygan WI-
1256 AM CDT Tue May 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 7 AM CDT THIS MORNING
THROUGH WEDNESDAY AFTERNOON...

.REST OF THE NIGHT...S wind 5 to 10 kts. Waves 2 ft or less. A
chance of showers after midnight.
.TUESDAY...S wind to 30 kts with gale force gusts to around
35 kts. Waves 6 to 10 ft building to 8 to 12 ft in the afternoon.
Rain showers likely in the morning, then a chance of showers and
a slight chance of thunderstorms in the afternoon.
.TUESDAY NIGHT...W wind 10 to 15 kts becoming NW to 30 kts in the
late evening and overnight. Waves 5 to 8 ft. Mostly cloudy.
.WEDNESDAY...NW wind to 30 kts becoming N 10 to 20 kts early in
the afternoon. Waves 2 to 4 ft. Partly sunny.

$$

See Lake Michigan Open Lake Forecast for Thursday through Saturday.

Wave height forecast is for ice free areas.