FZUS53 KDTX 211935 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 335 PM EDT Thu May 21 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. LHZ422-220345- Inner Saginaw Bay SW of Point Au Gres to Bay Port MI- 335 PM EDT Thu May 21 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...Northeast winds 20 to 25 knots diminishing to 15 to 20 knots in the late evening and overnight. Partly cloudy. Waves 2 to 4 feet. .FRIDAY...East winds 15 to 20 knots becoming northeast 20 to 25 knots with gusts to 30 knots early in the afternoon. Partly cloudy. Waves 2 to 4 feet. .FRIDAY NIGHT...East winds 20 to 25 knots. Gusts to 30 knots until early morning. Mostly cloudy. A chance of showers after midnight. Waves 3 to 5 feet. Waves occasionally around 7 feet. .SATURDAY...East winds 20 to 25 knots with gusts to 30 knots. Rain showers. Waves 3 to 5 feet. Waves occasionally around 7 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ421-220345- Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay- 335 PM EDT Thu May 21 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY MORNING... .TONIGHT...Northeast winds 15 to 20 knots. Mostly clear. Waves 2 to 4 feet subsiding to 1 to 3 feet after midnight. .FRIDAY...East winds 15 to 20 knots becoming northeast 20 to 25 knots early in the afternoon. Partly cloudy. Waves 1 to 3 feet building to 2 to 4 feet in the late morning and afternoon. .FRIDAY NIGHT...Northeast winds 20 to 25 knots becoming east 15 to 20 knots in the late evening and early morning, then increasing to 20 to 25 knots after midnight. Partly cloudy early in the evening becoming cloudy. A chance of showers after midnight. Waves 3 to 5 feet. Waves occasionally around 7 feet. .SATURDAY...East winds 20 to 25 knots with gusts to 30 knots. Rain showers likely until late afternoon, then showers early in the afternoon. Waves 5 to 7 feet. Waves occasionally around 10 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ441-220345- Port Austin to Harbor Beach MI- 335 PM EDT Thu May 21 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY MORNING... .TONIGHT...Northeast winds 10 to 15 knots. Partly cloudy. Waves 1 to 3 feet. .FRIDAY...East winds 10 to 15 knots. Mostly sunny early in the morning becoming partly cloudy. Waves 1 to 3 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Mostly cloudy. A chance of showers after midnight. Waves 3 to 5 feet. Waves occasionally around 7 feet. .SATURDAY...East winds 20 to 25 knots with gusts to 30 knots. Rain showers likely until late afternoon, then showers early in the afternoon. Waves 5 to 7 feet. Waves occasionally around 10 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ442-220345- Harbor Beach to Port Sanilac MI- 335 PM EDT Thu May 21 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...Northeast winds 15 to 20 knots becoming east 10 to 15 knots after midnight. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet early in the morning. .FRIDAY...East winds 10 to 15 knots. Partly cloudy. Waves 2 to 4 feet. .FRIDAY NIGHT...East winds 15 to 20 knots increasing to 20 to 25 knots after midnight. Cloudy. A chance of showers after midnight. Waves 3 to 5 feet. Waves occasionally around 6 feet. .SATURDAY...East winds 20 to 25 knots with gusts to 30 knots. Rain showers. Waves 5 to 7 feet. Waves occasionally around 10 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ443-220345- Port Sanilac to Port Huron MI- 335 PM EDT Thu May 21 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...North winds 15 to 20 knots becoming east 10 to 15 knots after midnight. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet early in the morning. .FRIDAY...East winds 15 to 20 knots. Partly cloudy until late afternoon becoming mostly cloudy. Waves 2 to 4 feet. .FRIDAY NIGHT...East winds 15 to 20 knots increasing to 20 to 25 knots after midnight. Cloudy. Light showers likely after midnight. Waves 3 to 5 feet. Waves occasionally around 7 feet. .SATURDAY...East winds 20 to 25 knots. Gusts to 30 knots until late afternoon. Rain showers. Waves 5 to 7 feet. Waves occasionally around 10 feet. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LEZ444-220345- Michigan Waters of Lake Erie from Detroit River to North Cape MI- 335 PM EDT Thu May 21 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...East winds 15 to 20 knots. Mostly clear. Waves 3 to 5 feet. Waves occasionally around 7 feet. .FRIDAY...East winds 20 to 25 knots. Partly cloudy until late afternoon becoming mostly cloudy. Waves 4 to 6 feet. Waves occasionally around 8 feet. .FRIDAY NIGHT...East winds 20 to 25 knots. Gusts to 30 knots early in the evening then Gusts to 30 knots after midnight. Rain showers likely in the late evening and early morning. Rain showers after midnight. Waves 4 to 6 feet. Waves occasionally around 8 feet. .SATURDAY...East winds 20 to 25 knots diminishing to 10 to 15 knots. Rain showers until late afternoon, then showers likely early in the afternoon. Waves 3 to 5 feet. Waves occasionally around 7 feet. See Lake Erie Open Lake Forecast for days 3 through 5. The water temperature at Belle Isle is missing. $$ SS You can obtain your latest National Weather Service forecasts online a www.weather.gov/greatlakes