FZUS53 KGRB 211809
NSHGRB

Nearshore Marine Forecast
National Weather Service Green Bay WI
109 PM CDT Thu May 21 2026

For waters within five nautical miles of shore on Lake Michigan

LMZ521-522-212200-
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-
109 PM CDT Thu May 21 2026

.THIS AFTERNOON...NE wind 10 to 15 kts. Waves 2 ft or less.
Partly cloudy.
.TONIGHT...E wind 5 to 10 kts. Waves 2 ft or less. Partly cloudy
in the evening then becoming mostly cloudy.
.FRIDAY...NE wind 10 to 20 kts. Waves 2 ft or less building to
2 to 4 ft in the afternoon. Partly sunny.
.FRIDAY NIGHT...E wind 10 to 20 kts. Waves 2 to 4 ft subsiding to
1 to 3 ft after midnight. A chance of showers after midnight.

$$

LMZ541-212200-
Rock Island Passage to Sturgeon Bay WI-
109 PM CDT Thu May 21 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY AFTERNOON THROUGH
FRIDAY EVENING...

.THIS AFTERNOON...NE wind 10 to 15 kts. Waves 2 ft or less.
Partly cloudy.
.TONIGHT...NE wind 10 to 15 kts veering E in the late evening and
overnight. Waves 1 to 3 ft. Mostly clear in the evening then
becoming mostly cloudy.
.FRIDAY...NE wind 10 to 15 kts increasing to 15 to 25 kts early
in the afternoon. Waves 1 to 3 ft building to 3 to 5 ft in the
afternoon. Partly sunny.
.FRIDAY NIGHT...E wind 15 to 25 kts. Waves 4 to 7 ft subsiding to
2 to 4 ft after midnight. Mostly cloudy.

$$

LMZ542-543-212200-
Sturgeon Bay to Two Rivers WI-Two Rivers to Sheboygan WI-
109 PM CDT Thu May 21 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY AFTERNOON THROUGH
FRIDAY EVENING...

.THIS AFTERNOON...NE wind 10 to 15 kts. Waves 1 to 3 ft. Partly
sunny.
.TONIGHT...NE wind 10 to 15 kts veering E in the late evening and
overnight. Waves 1 to 3 ft. Partly cloudy in the evening then
becoming mostly cloudy.
.FRIDAY...NE wind 10 to 20 kts. Waves 1 to 3 ft building to 2 to
4 ft in the afternoon. Partly sunny.
.FRIDAY NIGHT...E wind 15 to 25 kts backing NE 10 to 15 kts in
the late evening and overnight. Waves 3 to 5 ft. A chance of
showers after midnight.

$$

See Lake Michigan Open Lake Forecast for Saturday through Monday.

Wave height forecast is for ice free areas.