FZUS53 KMKX 180810 NSHMKX Nearshore Marine Forecast National Weather Service Milwaukee/Sullivan WI 310 AM CDT Mon May 18 2026 For waters within five nautical miles of shore on Lake Michigan LMZ643-182100- Sheboygan to Port Washington WI- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots. Mostly cloudy with a 50 percent chance of showers and thunderstorms. Areas of dense fog. Waves 3 to 5 feet. .TODAY...South wind 15 to 20 knots. Chance of showers and thunderstorms until late afternoon, then slight chance of showers and thunderstorms late in the afternoon. Waves 3 to 4 feet building to 4 to 6 feet late in the morning, then subsiding to 3 to 4 feet in the afternoon. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Patchy fog through around midnight. slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet building to 4 to 6 feet. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering west late in the afternoon. Rain showers likely and a chance of thunderstorms through the day. Waves 5 to 7 feet subsiding to 3 to 4 feet. .TUESDAY NIGHT...Northwest wind 15 to 20 knots easing to 10 to 15 knots after midnight, then veering north early in the morning. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 2 feet in the late evening and overnight. $$ LMZ644-182100- Port Washington to North Point Light WI- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots. Mostly cloudy with a 50 percent chance of showers and thunderstorms. Patchy dense fog. Waves 3 to 4 feet. .TODAY...South wind 10 to 20 knots becoming 15 to 20 knots in the late morning and early afternoon, then becoming south 15 to 20 knots late in the afternoon. Chance of showers and thunderstorms until late afternoon, then slight chance of showers and thunderstorms late in the afternoon. Waves 3 to 4 feet. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet building to 3 to 5 feet early in the morning. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering west late in the afternoon. Rain showers likely and a chance of thunderstorms through the day. Waves 3 to 5 feet subsiding to 3 to 4 feet in the afternoon. .TUESDAY NIGHT...Northwest wind 15 to 20 knots easing to 10 to 15 knots after midnight, then veering north early in the morning. Partly cloudy. Waves 1 to 2 feet. $$ LMZ645-182100- North Point Light to Wind Point WI- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots. Mostly cloudy with a 50 percent chance of showers and thunderstorms. Waves 2 to 4 feet. .TODAY...South wind 15 to 20 knots. Rain showers likely in the morning. Chance of thunderstorms through the day. Chance of showers in the afternoon. Waves 2 to 4 feet. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering southwest late in the morning, then veering west early in the afternoon becoming 15 to 20 knots late in the afternoon. Showers likely and a chance of thunderstorms. Waves 3 to 4 feet. .TUESDAY NIGHT...Northwest wind 15 to 20 knots easing to 10 to 15 knots late in the evening, then becoming northwest 10 to 15 knots after midnight veering north early in the morning. Partly cloudy. Waves 1 to 2 feet building to 2 to 4 feet early in the morning. $$ LMZ646-182100- Wind Point WI to Winthrop Harbor IL- 310 AM CDT Mon May 18 2026 .EARLY THIS MORNING...South wind 10 to 15 knots rising to 15 to 20 knots early in the morning. Partly cloudy with a 50 percent chance of showers and thunderstorms. Waves 2 to 4 feet. .TODAY...South wind 15 to 20 knots easing to 10 to 15 knots in the afternoon. Rain showers likely in the morning. Chance of thunderstorms through the day. Chance of showers in the afternoon. Waves 2 to 4 feet. .TONIGHT...South wind 15 to 20 knots becoming 15 to 25 knots early in the morning. Slight chance of showers and thunderstorms through around midnight, then showers likely and a chance of thunderstorms after midnight. Waves 3 to 4 feet. A small craft advisory may be needed. .TUESDAY...South wind 15 to 25 knots veering southwest late in the morning, then becoming 15 to 20 knots early in the afternoon veering west late in the afternoon. Showers likely and a chance of thunderstorms. Waves 3 to 4 feet subsiding to 1 to 2 feet late in the afternoon. .TUESDAY NIGHT...Northwest wind 10 to 15 knots with gusts to around 20 knots veering north early in the morning. Partly cloudy. Waves 1 to 2 feet. $$ See Lake Michigan Open Waters Forecast for Wednesday through Friday.