


Great Lakes Forecast
Issued by NWS
Issued by NWS
756 FZUS63 KDTX 200752 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 352 AM EDT Sun Apr 20 2025 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. .SYNOPSIS...High pressure builds to 30.50 inches as it drifts overhead today, allowing benign marine conditions to persist. Low pressure, 29.60 inches, then tracks across the western Great Lakes on Monday drawing an occluded front across the local waters. Shower and thunderstorms are expected in the morning, with winds and waves increasing through the day. LCZ460-201600- Lake St Clair- 352 AM EDT Sun Apr 20 2025 .TODAY...Northeast winds 10 to 15 knots diminishing to 5 to 10 knots in the late morning and early afternoon...then veering to the southeast late in the afternoon. Partly sunny. Waves 2 feet or less. .TONIGHT...East winds 10 to 15 knots increasing to 15 to 20 knots after midnight...then diminishing to 10 to 15 knots early in the morning. Mostly cloudy. A chance of light rain after midnight. Waves 2 feet or less. .MONDAY...Southeast winds 10 to 15 knots becoming south 15 to 20 knots with gusts to 30 knots in the late morning and afternoon. Light rain. Waves 1 to 3 feet building to 2 to 4 feet in the late morning and afternoon. A Small Craft Advisory may be needed. .MONDAY NIGHT...West winds 15 to 20 knots. Gusts to 30 knots early in the evening. Partly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. .TUESDAY...West winds 10 to 15 knots becoming north 5 to 10 knots in the evening. Mostly sunny becoming sunny in the afternoon becoming mostly clear. Waves 2 feet or less. .WEDNESDAY...East winds 5 to 10 knots. Partly cloudy. Waves 2 feet or less. .THURSDAY...Southeast winds 10 to 15 knots. Partly cloudy. A chance of light rain. Waves 2 feet or less. $$ MR Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes