FZUS53 KGRB 190137 NSHGRB Nearshore Marine Forecast National Weather Service Green Bay WI 836 PM CDT Sat Apr 18 2026 For waters within five nautical miles of shore on Lake Michigan LMZ521-522-190400- 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 PM CDT Sat Apr 18 2026 .TONIGHT...W wind 10 to 20 kts. Waves 1 to 3 ft. Mostly cloudy in the evening then becoming partly cloudy. .SUNDAY...NW wind 10 to 15 kts. Waves 2 ft or less. Partly sunny. .SUNDAY NIGHT...N wind 5 to 10 kts backing W 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 in the morning then becoming partly cloudy. $$ LMZ541-190400- Rock Island Passage to Sturgeon Bay WI- 837 PM CDT Sat Apr 18 2026 .TONIGHT...W wind 10 to 15 kts. Waves 1 to 3 ft. Mostly cloudy in the evening then becoming partly cloudy. .SUNDAY...NW wind 10 to 15 kts. Waves 2 ft or less. Partly sunny. .SUNDAY NIGHT...N wind 10 to 15 kts backing NW 5 to 10 kts after midnight. Waves 2 ft or less. Mostly clear. .MONDAY...W wind 5 to 10 kts backing S 10 to 15 kts mid-day, then increasing to 15 to 25 kts early in the afternoon. Waves 2 ft or less building to 3 to 5 ft in the afternoon. Mostly sunny in the morning then becoming partly cloudy. A Small Craft Advisory may be needed. $$ LMZ542-543-190400- Sturgeon Bay to Two Rivers WI-Two Rivers to Sheboygan WI- 837 PM CDT Sat Apr 18 2026 .TONIGHT...W wind 15 to 25 kts decreasing to 10 to 15 kts in the late evening and overnight. Waves 1 to 3 ft. Partly cloudy. .SUNDAY...NW wind 10 to 15 kts. Waves 2 ft or less. Partly sunny. .SUNDAY NIGHT...N wind 10 to 15 kts backing NW 5 to 10 kts after midnight. 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. $$ See Lake Michigan Open Lake Forecast for Tuesday through Thursday. Wave height forecast is for ice free areas.