308
FZUS63 KDTX 200759
GLFSC

Lake St Clair Forecast
National Weather Service Detroit/Pontiac MI
359 AM EDT Mon Jul 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 influence wanes across the central Great
Lakes today with dry initial conditions, then a cold front passes
through tonight into Tuesday. This leads to periods of showers
and thunderstorms. Wet weather could persist on Tuesday before
high pressure from Alberta/Manitoba builds in by Tuesday evening
with a drying effect.

LCZ460-201600-
Lake St Clair-
359 AM EDT Mon Jul 20 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
TUESDAY EVENING...

.TODAY...Light and variable winds becoming south 10 to 15 knots.
Partly sunny. Patchy smoke. Waves 2 feet or less.
.TONIGHT...South winds 15 to 20 knots becoming southwest 20 to 25
knots early in the morning. Partly cloudy in the evening.. then
mostly cloudy with a chance of thunderstorms after midnight. Mostly
cloudy with a chance of showers and thunderstorms early in the
morning. Patchy smoke. Waves 1 to 3 feet building to 2 to 4 feet
early in the morning.
.TUESDAY...Southwest winds 20 to 25 knots with gusts to 30 knots
becoming west 15 to 20 knots in the late morning and afternoon.
Mostly sunny. A chance of light showers until late afternoon.. then
light showers likely and a chance of thunderstorms early in the
afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late
morning and afternoon.
.TUESDAY NIGHT...Northwest winds 15 to 20 knots increasing to 20 to
25 knots in the late evening and overnight. Partly cloudy. A chance
of showers and thunderstorms early in the evening. Waves 1 to 3 feet
building to 2 to 4 feet in the late evening and overnight.
.WEDNESDAY...Northwest winds 20 to 25 knots becoming north 10 to 15
knots. Partly sunny becoming mostly sunny in the afternoon becoming
clear. Waves 1 to 3 feet.
.THURSDAY...South winds 5 to 10 knots. Clear. Waves 2 feet or less.
.FRIDAY...South winds 5 to 10 knots. Mostly clear. Waves 2 feet or
less.

$$

AA

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

Graphical marine forecasts are available at weather.gov/greatlakes