National Weather Service Marine Forecast FZUS63 KDTX

FZUS63 KDTX 310143
GLFSC

Lake St Clair Forecast
National Weather Service Detroit/Pontiac MI
943 PM EDT Thu Jul 30 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, 30.30 inches, governs Great Lakes conditions into tomorrow. Low pressure then tracks into the Ohio Valley this weekend, with local pressure averaging around 29.90 inches. This brings rain and isolated thunderstorm chances to the Great Lakes Friday night into Sunday along with elevated winds and waves into Saginaw Bay and the Thumb nearshores.

LCZ460-310945
Lake St Clair
943 PM EDT Thu Jul 30 2026

REST OF TONIGHT
Light and variable winds. Mostly clear. Waves 2 feet or less.

FRIDAY
Light and variable winds becoming southeast 5 to 10 knots in the afternoon. Partly sunny. Waves 2 feet or less.

FRIDAY NIGHT
South winds 5 to 10 knots. Cloudy. Waves 2 feet or less.

SATURDAY
East winds 5 to 10 knots. Cloudy. A chance of light showers until late afternoon. Light showers likely and a chance of thunderstorms early in the afternoon. Waves 2 feet or less.

SATURDAY NIGHT
Northeast winds 10 to 15 knots. Mostly cloudy. A chance of thunderstorms early in the evening. Light showers likely

then a chance of light showers after midnight. Waves 2 feet or less. .SUNDAY

Northeast winds 10 to 15 knots becoming north 15 to 20 knots in the evening. Mostly cloudy with a chance of light showers in the morning...then partly cloudy with a chance of showers and thunderstorms in the afternoon and evening. Waves 1 to 3 feet.

MONDAY
Northeast winds 10 to 15 knots. Mostly clear. Waves 2 feet or less.

TUESDAY
Southeast winds 5 to 10 knots. Mostly clear. Waves 2 feet or less.

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AA

Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc

Graphical marine forecasts are available at weather.gov/greatlakes