FZUS53 KDTX 210757 NSHDTX Nearshore Marine Forecast for Michigan National Weather Service Detroit/Pontiac MI 357 AM 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. LHZ422-211600- Inner Saginaw Bay SW of Point Au Gres to Bay Port MI- 357 AM EDT Thu May 21 2026 .TODAY...Northeast winds 15 to 20 knots. Mostly sunny. Waves 1 to 3 feet building to 2 to 4 feet late in the afternoon. .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 after midnight. .FRIDAY...East winds 10 to 15 knots becoming northeast 15 to 20 knots in the late morning and afternoon. Partly cloudy. Waves 2 to 4 feet. .FRIDAY NIGHT...East winds 15 to 20 knots increasing to 20 to 25 knots after midnight. Partly cloudy early in the evening becoming cloudy. Rain showers likely after midnight. Waves 3 to 5 feet. Waves occasionally around 7 feet. A Small Craft Advisory may be needed. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ421-211600- Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay- 357 AM EDT Thu May 21 2026 .TODAY...Northeast winds 15 to 20 knots. Mostly sunny. Waves 1 to 3 feet building to 2 to 4 feet in the late morning and afternoon. .TONIGHT...Northeast winds 15 to 20 knots diminishing to 10 to 15 knots in the late evening and overnight. Partly cloudy. Waves 1 to 3 feet. .FRIDAY...East winds 10 to 15 knots becoming northeast 15 to 20 knots in the late morning and afternoon. Partly cloudy. Waves 1 to 3 feet building to 2 to 4 feet in the late morning and afternoon. .FRIDAY NIGHT...East winds 15 to 20 knots. Partly cloudy early in the evening becoming cloudy. Rain showers likely after midnight. Waves 4 to 6 feet. Waves occasionally around 7 feet. A Small Craft Advisory may be needed. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ441-211600- Port Austin to Harbor Beach MI- 357 AM EDT Thu May 21 2026 .TODAY...Northeast winds 15 to 20 knots diminishing to 10 to 15 knots in the afternoon. Mostly sunny. Waves 2 to 4 feet. .TONIGHT...Northeast winds 10 to 15 knots. Partly cloudy. Waves 1 to 3 feet. .FRIDAY...East winds 10 to 15 knots becoming northeast 15 to 20 knots early in the afternoon. Partly cloudy. Waves 1 to 3 feet. .FRIDAY NIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots in the late evening and overnight. Partly cloudy early in the evening becoming cloudy. Rain showers likely after midnight. Waves 3 to 5 feet building to 5 to 7 feet after midnight. Waves occasionally around 10 feet. A Small Craft Advisory may be needed. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ442-211600- Harbor Beach to Port Sanilac MI- 357 AM EDT Thu May 21 2026 .TODAY...Northeast winds 10 to 15 knots. Mostly sunny. Waves 1 to 3 feet. .TONIGHT...Northeast winds 10 to 15 knots veering to the east after midnight. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet after midnight. .FRIDAY...Northeast winds 10 to 15 knots. Partly cloudy until late afternoon becoming mostly sunny. Waves 2 to 4 feet. .FRIDAY NIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots in the late evening and overnight. Partly cloudy early in the evening becoming cloudy. Rain showers likely after midnight. Waves 4 to 6 feet building to 5 to 7 feet after midnight. Waves occasionally around 10 feet. A Small Craft Advisory may be needed. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LHZ443-211600- Port Sanilac to Port Huron MI- 357 AM EDT Thu May 21 2026 .TODAY...Northeast winds 10 to 15 knots becoming north 15 to 20 knots late in the afternoon. Mostly sunny. Waves 1 to 3 feet. .TONIGHT...Northeast winds 10 to 15 knots veering to the east after midnight. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet after midnight. .FRIDAY...East winds 10 to 15 knots. Partly cloudy. Waves 2 to 4 feet. .FRIDAY NIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots in the late evening and overnight. Mostly cloudy. Rain showers likely after midnight. Waves 4 to 6 feet building to 5 to 7 feet after midnight. Waves occasionally around 10 feet. A Small Craft Advisory may be needed. See Lake Huron Open Lake Forecast for days 3 through 5. $$ LEZ444-211600- Michigan Waters of Lake Erie from Detroit River to North Cape MI- 357 AM EDT Thu May 21 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH SATURDAY MORNING... .TODAY...Northeast winds 15 to 20 knots diminishing to 10 to 15 knots late in the morning, then becoming east 15 to 20 knots in the afternoon. Mostly sunny. Waves 2 to 4 feet. .TONIGHT...East winds 15 to 20 knots. Mostly clear. Waves 3 to 5 feet. Waves occasionally around 7 feet. .FRIDAY...East winds 15 to 20 knots increasing to 20 to 25 knots in the late morning and afternoon. Partly cloudy until late afternoon becoming mostly cloudy. A chance of showers early in the afternoon. Waves 4 to 6 feet. Waves occasionally around 8 feet. .FRIDAY NIGHT...East winds 20 to 25 knots. Gusts to 30 knots early in the evening. Rain showers likely until early morning, then showers after midnight. Waves 4 to 6 feet. Waves occasionally around 8 feet. Small Craft Advisory conditions are expected to continue beyond the forecast period. Please refer to the Open Lakes Forecast for more information. See Lake Erie Open Lake Forecast for days 3 through 5. The water temperature at Belle Isle is missing. $$ TF You can obtain your latest National Weather Service forecasts online a www.weather.gov/greatlakes