FZUS53 KDTX 180721 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 321 AM EDT Mon May 18 2026 For waters within five nautical miles of shore Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. LHZ422-181530- Inner Saginaw Bay SW of Point Au Gres to Bay Port MI- 321 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING... .TODAY...South winds 15 to 20 knots becoming southwest 20 to 25 knots in the afternoon. Mostly sunny in the morning, then partly cloudy with showers likely and a chance of thunderstorms in the afternoon. Waves 2 to 4 feet building to 3 to 5 feet in the late morning and afternoon. Waves occasionally around 7 feet. .TONIGHT...Southwest winds 20 to 25 knots diminishing to 15 to 20 knots in the late evening and overnight. Mostly cloudy. Showers likely and a chance of thunderstorms early in the evening, then a chance of showers and thunderstorms in the late evening and overnight. Waves 2 to 4 feet. .TUESDAY...Southwest winds 20 to 25 knots increasing to 30 knots in the late morning and afternoon. Mostly cloudy early in the morning becoming partly cloudy. A chance of showers in the late morning and early afternoon. Light showers likely and a chance of thunderstorms early in the afternoon. Waves 3 to 5 feet. Waves occasionally around 6 feet. .TUESDAY NIGHT...West winds 20 to 25 knots with gusts to 30 knots becoming northwest 15 to 20 knots after midnight. Mostly cloudy until early morning becoming partly cloudy. Light showers likely and a chance of thunderstorms early in the evening. Waves 3 to 5 feet. Waves occasionally around 7 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ421-181530- Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay- 321 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING... .TODAY...Southwest winds 15 to 20 knots. Partly cloudy. A chance of showers and thunderstorms in the afternoon. Waves 2 to 4 feet. .TONIGHT...Southwest winds 15 to 20 knots. Mostly cloudy. Rain showers likely in the evening. A chance of thunderstorms. A chance of showers after midnight. Waves 3 to 5 feet. Waves occasionally around 7 feet. .TUESDAY...Southwest winds 20 to 25 knots. Gusts to 30 knots in the late morning and afternoon. Mostly cloudy early in the morning becoming partly cloudy. A chance of showers in the late morning and early afternoon. Light showers likely early in the afternoon. Waves 4 to 6 feet. Waves occasionally around 8 feet. .TUESDAY NIGHT...West winds 20 to 25 knots with gusts to 30 knots becoming northwest 15 to 20 knots in the late evening and overnight. Mostly cloudy until early morning becoming partly cloudy. Light showers likely early in the evening. Waves 3 to 5 feet. Waves occasionally around 7 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ441-181530- Port Austin to Harbor Beach MI- 321 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING... .TODAY...South winds 10 to 15 knots becoming southwest 15 to 20 knots in the afternoon. Partly cloudy in the morning, then mostly sunny with showers likely and a chance of thunderstorms in the afternoon. Waves 2 to 4 feet. .TONIGHT...Southwest winds 15 to 20 knots. Mostly cloudy. Rain showers likely in the evening. A chance of thunderstorms. A chance of showers after midnight. Waves 2 to 4 feet. .TUESDAY...Southwest winds 15 to 20 knots increasing to 20 to 25 knots with gusts to 30 knots in the late morning and afternoon. Mostly cloudy early in the morning becoming partly cloudy. A chance of showers in the late morning and early afternoon. Light showers likely early in the afternoon. Waves 1 to 3 feet building to 3 to 5 feet in the late morning and afternoon. Waves occasionally around 7 feet. .TUESDAY NIGHT...West winds 15 to 20 knots veering to the northwest in the late evening and early morning, then becoming north 10 to 15 knots after midnight. Mostly cloudy. Light showers likely and a chance of thunderstorms early in the evening. Waves 3 to 5 feet. Waves occasionally around 7 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ442-181530- Harbor Beach to Port Sanilac MI- 321 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING... .TODAY...South winds 10 to 15 knots increasing to 15 to 20 knots in the afternoon. Partly cloudy in the morning, then mostly sunny with a chance of thunderstorms and a slight chance of showers in the afternoon. Waves 1 to 3 feet building to 2 to 4 feet in the late morning and afternoon. .TONIGHT...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots in the late evening and overnight. Mostly cloudy until early morning becoming partly cloudy. Showers and thunderstorms likely in the evening, then a chance of showers and thunderstorms after midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. .TUESDAY...Southwest winds 15 to 20 knots. Gusts to 30 knots in the late morning and afternoon. Mostly cloudy early in the morning becoming partly cloudy. A chance of showers in the late morning and early afternoon. Light showers likely and a chance of thunderstorms early in the afternoon. Waves 2 to 4 feet building to 3 to 5 feet in the late morning and afternoon. Waves occasionally around 7 feet. .TUESDAY NIGHT...West winds 15 to 20 knots veering to the northwest in the late evening and early morning, then becoming north 10 to 15 knots after midnight. Mostly cloudy. A chance of showers and thunderstorms early in the evening, then a chance of showers in the late evening and early morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ443-181530- Port Sanilac to Port Huron MI- 321 AM EDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING... .TODAY...South winds 10 to 15 knots increasing to 15 to 20 knots in the late morning and afternoon. Mostly sunny. A chance of showers and thunderstorms in the afternoon. Waves 1 to 3 feet building to 2 to 4 feet in the afternoon. .TONIGHT...Southwest winds 15 to 20 knots. Mostly cloudy until early morning becoming partly cloudy. A chance of showers and thunderstorms until early morning, then a chance of showers after midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. .TUESDAY...Southwest winds 15 to 20 knots increasing to 20 to 25 knots early in the afternoon. Partly cloudy until late afternoon. A chance of showers in the late morning and early afternoon. Rain showers and a chance of thunderstorms early in the afternoon. Waves 2 to 4 feet. .TUESDAY NIGHT...West winds 15 to 20 knots veering to the north after midnight. Mostly cloudy. A chance of showers and thunderstorms until early morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and early morning, then building to 2 to 4 feet after midnight. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LEZ444-181530- Michigan Waters of Lake Erie from Detroit River to North Cape MI- 321 AM EDT Mon May 18 2026 .TODAY...South winds 10 to 15 knots becoming southwest 15 to 20 knots in the afternoon. Sunny. A slight chance of showers and thunderstorms in the afternoon. Waves 1 to 3 feet. .TONIGHT...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots in the late evening and overnight. Mostly cloudy with a chance of showers and thunderstorms until early morning, then partly cloudy with a chance of showers and a slight chance of thunderstorms after midnight. Waves 1 to 3 feet. .TUESDAY...Southwest winds 15 to 20 knots increasing to 20 to 25 knots early in the afternoon. Partly cloudy becoming mostly sunny in the late morning and early afternoon becoming partly cloudy. A chance of showers in the late morning and early afternoon. Light showers likely and a chance of thunderstorms early in the afternoon. Waves 1 to 3 feet building to 2 to 4 feet in the late morning and afternoon. A Small Craft Advisory may be needed. .TUESDAY NIGHT...Southwest winds 15 to 20 knots becoming west 10 to 15 knots in the late evening and overnight. Light showers and a chance of thunderstorms until early morning, then a chance of showers after midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. See Lake Erie Open Lake Forecast for days 3 through 5. The water temperature at Belle Isle is missing. $$ MR You can obtain your latest National Weather Service forecasts online a www.weather.gov/greatlakes