FZUS53 KGRB 191337 NSHGRB Nearshore Marine Forecast National Weather Service Green Bay WI 837 AM CDT Sun Apr 19 2026 For waters within five nautical miles of shore on Lake Michigan LMZ521-522-191600- 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- 837 AM CDT Sun Apr 19 2026 .TODAY...NW wind 10 to 15 kts. Waves 2 ft or less. Partly sunny. .TONIGHT...N wind 10 to 15 kts backing NW 5 to 10 kts after midnight. Waves 2 ft or less. Clear. .MONDAY...W wind 5 to 10 kts backing SW mid-day, then backing S 10 to 20 kts early in the afternoon. Waves 1 to 3 ft. Mostly sunny. .MONDAY NIGHT...S wind 15 to 25 kts veering SW 10 to 15 kts after midnight. Waves 2 to 4 ft. Mostly cloudy in the evening then becoming partly cloudy. A Small Craft Advisory may be needed. $$ LMZ541-191600- Rock Island Passage to Sturgeon Bay WI- 837 AM CDT Sun Apr 19 2026 .TODAY...NW wind 10 to 15 kts. Waves 2 ft or less. Partly sunny. .TONIGHT...N wind 10 to 15 kts backing NW 5 to 10 kts after midnight. Waves 1 to 3 ft. Mostly clear. .MONDAY...W wind 5 to 10 kts backing SW 10 to 15 kts mid-day, then backing S 15 to 25 kts early in the afternoon. Waves 2 ft or less building to 3 to 5 ft in the afternoon. Mostly sunny in the morning then becoming partly cloudy. A Small Craft Advisory may be needed. .MONDAY NIGHT...S wind to 30 kts decreasing to 10 to 20 kts after midnight. Waves 5 to 8 ft. Mostly cloudy in the evening then becoming partly cloudy. $$ LMZ542-543-191600- Sturgeon Bay to Two Rivers WI-Two Rivers to Sheboygan WI- 837 AM CDT Sun Apr 19 2026 .TODAY...NW wind 10 to 15 kts veering N early in the afternoon. Waves 2 ft or less. A chance of sprinkles in the afternoon. .TONIGHT...N wind 10 to 15 kts. Waves 2 ft or less. Partly cloudy in the evening then clearing. .MONDAY...SW wind 5 to 10 kts backing S 10 to 15 kts mid-day, then increasing to 15 to 25 kts early in the afternoon. Waves 2 ft or less building to 3 to 5 ft in the afternoon. Mostly sunny in the morning then becoming partly cloudy. A Small Craft Advisory may be needed. .MONDAY NIGHT...S wind to 30 kts decreasing to 10 to 20 kts after midnight. Waves 4 to 7 ft. Mostly cloudy in the evening then becoming partly cloudy. $$ See Lake Michigan Open Lake Forecast for Tuesday through Thursday. Wave height forecast is for ice free areas.