FZUS63 KDTX 191349 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 949 AM EDT Tue Aug 19 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, 29.90 inches, tracks across the central Great Lakes today, triggering showers and thunderstorms. Gusty northeast wind will follow the departure of this system on Wednesday. High pressure builds in from the northern Great Lakes through the late week. LCZ460-192200- Lake St Clair- 949 AM EDT Tue Aug 19 2025 .REST OF TODAY...Southeast winds 5 to 10 knots. Showers and a chance of thunderstorms in the late morning and early afternoon.. then showers likely and a chance of thunderstorms late in the afternoon. Waves 2 feet or less. .TONIGHT...East winds 5 to 10 knots backing to the northeast after midnight...then increasing to 10 to 15 knots early in the morning. Partly cloudy this evening becoming mostly cloudy. Showers likely and a chance of thunderstorms early in the evening. A chance of showers in the late evening and early morning. Waves 2 feet or less. .WEDNESDAY...North winds 10 to 15 knots. Partly sunny. Waves 1 to 3 feet. .WEDNESDAY NIGHT...Northeast winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Mostly clear. Waves 1 to 3 feet. .THURSDAY...Northeast winds 10 to 15 knots. Mostly sunny becoming clear. Waves 2 feet or less. .FRIDAY...South winds 5 to 10 knots. Clear. Waves 2 feet or less. .SATURDAY...West winds 10 to 15 knots. Mostly clear. Waves 2 feet or less. $$ DRK Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes