FZUS63 KDTX 201955 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 355 PM EDT Fri Mar 20 2026 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, 30.10 inches, briefly fills in over the Great Lakes tonight through tomorrow morning holding light winds across the region. A strong cold front then sinks south on Sunday which will bring breezy northeast winds through the day. LCZ460-210400- Lake St Clair- 355 PM EDT Fri Mar 20 2026 .TONIGHT...North winds 10 to 15 knots diminishing to 5 to 10 knots after midnight. Partly cloudy becoming mostly cloudy. Waves 2 feet or less. .SATURDAY...North winds 5 to 10 knots early in the morning becoming light and variable...then becoming southeast 5 to 10 knots in the afternoon. Partly sunny. Waves 2 feet or less. .SATURDAY NIGHT...South winds 5 to 10 knots veering to the southwest after midnight. Partly cloudy early in the evening becoming mostly cloudy. Waves 2 feet or less. .SUNDAY...Southwest winds 5 to 10 knots veering to the north in the late morning and early afternoon...then increasing to 10 to 15 knots early in the afternoon. Mostly cloudy. A chance of light rain. Waves 2 feet or less. .SUNDAY NIGHT...North winds 15 to 20 knots. Mostly cloudy. A chance of light rain . Waves 1 to 3 feet. .MONDAY...North winds 10 to 15 knots. Partly sunny becoming mostly clear. Waves 2 feet or less. .TUESDAY...Southwest winds 10 to 15 knots. Partly cloudy. Waves 2 feet or less. .WEDNESDAY...East winds 15 to 20 knots. Partly cloudy. Waves 2 feet or less. $$ AM Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes