


Great Lakes Forecast
Issued by NWS
Issued by NWS
935 FZUS63 KDTX 160137 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 937 PM EDT Tue Jul 15 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...A hybrid cold front and low pressure trough, averaging 29.80 inches, moves into the Great Lakes Wednesday and Thursday which brings showers and thunderstorms to the marine zones. Strong to severe thunderstorms will be possible Wednesday afternoon and evening. North-northwest winds behind this system will increase on Thursday, ranging from 20-25 knots. LCZ460-160945- Lake St Clair- 937 PM EDT Tue Jul 15 2025 .REST OF TONIGHT...South winds 5 to 10 knots. Mostly clear. Waves 2 feet or less. .WEDNESDAY...South winds 5 to 10 knots. Partly sunny with a chance of showers and thunderstorms. Some thunderstorms may produce heavy rainfall. Waves 2 feet or less. .WEDNESDAY NIGHT...South winds 5 to 10 knots becoming southwest 10 to 15 knots after midnight. Partly cloudy. A chance of showers and thunderstorms in the evening...then a chance of light showers after midnight. Some thunderstorms may produce heavy rainfall in the evening. Waves 2 feet or less. .THURSDAY...West winds 10 to 15 knots. Partly sunny. A chance of light showers in the morning...then light showers likely and a chance of thunderstorms in the afternoon. Waves 2 feet or less. .THURSDAY NIGHT...North winds 10 to 15 knots. Mostly cloudy in the evening becoming partly cloudy. Waves 2 feet or less. .FRIDAY...Northeast winds 10 to 15 knots diminishing to 5 to 10 knots in the afternoon and evening. Mostly sunny becoming sunny in the afternoon becoming mostly clear. Waves 2 feet or less. .SATURDAY...Southeast winds 5 to 10 knots. Partly cloudy. A chance of showers and thunderstorms. Waves 2 feet or less. .SUNDAY...Northeast winds 5 to 10 knots. Partly cloudy. A chance of showers and thunderstorms. Waves 2 feet or less. $$ JA Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes