


Great Lakes Forecast
Issued by NWS
Issued by NWS
291 FZUS63 KDTX 180154 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 954 PM EDT Fri Oct 17 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...Low pressure, 29.20 inches, rapidly develops along a cold front over the mid-Mississippi and moves over lower Michigan Sunday, bringing the chance for a few southerly gales late Sunday morning with higher probabilities for northwesterly gales over most of Lake Huron by Sunday evening. A Gale Watch is in effect late Sunday afternoon through Sunday night. LCZ460-181000- Lake St Clair- 954 PM EDT Fri Oct 17 2025 .REST OF TONIGHT...South winds 10 to 15 knots. Mostly cloudy. Waves 2 feet or less. .SATURDAY...South winds 10 to 15 knots. Partly sunny. A chance of light showers early in the afternoon. Light showers likely late in the afternoon. Waves 2 feet or less. .SATURDAY NIGHT...South winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Showers. A chance of thunderstorms in the late evening and early morning. Waves 1 to 3 feet. .SUNDAY...South winds 15 to 20 knots with gusts to 30 knots becoming southwest 20 to 25 knots with gusts to 30 knots early in the afternoon. Showers. Waves 2 to 4 feet. A Small Craft Advisory may be needed. .SUNDAY NIGHT...West winds 20 to 25 knots. Gusts to 30 knots until early morning. Showers early in the evening...then partly cloudy with a chance of light showers in the late evening and early morning. Mostly clear after midnight. Waves 2 to 4 feet. .MONDAY...West winds 15 to 20 knots diminishing to 10 to 15 knots in the afternoon...then becoming south 20 to 25 knots in the evening. Sunny...then mostly clear with a chance of light showers in the evening. Waves 1 to 3 feet. .TUESDAY...West winds to 30 knots with gusts to 35 knot gales. Partly cloudy. Light showers likely. Waves 2 to 4 feet. A Gale Warning may be needed. .WEDNESDAY...West winds to 30 knots. Partly cloudy. A chance of light showers. Waves 2 to 4 feet. $$ DRK Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes