FZUS53 KGRB 201255
NSHGRB

Nearshore Marine Forecast
National Weather Service Green Bay WI
755 AM CDT Mon Apr 20 2026

For waters within five nautical miles of shore on Lake Michigan

LMZ521-522-201600-
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-
755 AM CDT Mon Apr 20 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM CDT THIS AFTERNOON
THROUGH LATE TONIGHT...

.TODAY...S wind 10 to 15 kts. Waves 1 to 3 ft. Sunny in the
morning then becoming partly cloudy.
.TONIGHT...S wind 15 to 25 kts decreasing to 10 to 15 kts after
midnight. Waves 2 to 4 ft subsiding to 1 to 3 ft after midnight.
Mostly cloudy in the evening then becoming partly cloudy.
.TUESDAY...SW wind 5 to 10 kts backing E early in the afternoon.
Waves 2 ft or less. Sunny.
.TUESDAY NIGHT...NE wind 5 to 10 kts. Waves 2 ft or less. Clear.

$$

LMZ541-201600-
Rock Island Passage to Sturgeon Bay WI-
755 AM CDT Mon Apr 20 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM CDT THIS AFTERNOON
THROUGH TUESDAY AFTERNOON...

.TODAY...SW wind 10 to 15 kts backing S 15 to 25 kts early in the
afternoon. Waves 2 ft or less building to 4 to 7 ft in the
afternoon. Sunny in the morning then becoming partly cloudy.
.TONIGHT...S wind 15 to 25 kts. Waves 5 to 8 ft. Mostly cloudy.
.TUESDAY...SW wind 10 to 15 kts backing SE 5 to 10 kts early in
the afternoon. Waves 4 to 7 ft subsiding to 2 to 4 ft in the
afternoon. Sunny.
.TUESDAY NIGHT...NE wind 5 to 10 kts. Waves 1 to 3 ft. Clear.

$$

LMZ542-543-201600-
Sturgeon Bay to Two Rivers WI-Two Rivers to Sheboygan WI-
755 AM CDT Mon Apr 20 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM CDT THIS AFTERNOON
THROUGH TUESDAY AFTERNOON...

.TODAY...S wind 10 to 15 kts increasing to 15 to 25 kts early in
the afternoon. Waves 2 ft or less building to 4 to 7 ft in the
afternoon. Sunny in the morning then becoming partly cloudy.
.TONIGHT...S wind 15 to 25 kts decreasing to 10 to 15 kts after
midnight. Waves 4 to 7 ft. Mostly cloudy.
.TUESDAY...S wind 5 to 10 kts backing SE early in the afternoon.
Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon. Mostly
sunny.
.TUESDAY NIGHT...NE wind 10 to 15 kts. Waves 1 to 3 ft. Mostly
clear.

$$

See Lake Michigan Open Lake Forecast for Wednesday through Friday.

Wave height forecast is for ice free areas.