174
FZUS63 KDTX 201354
GLFSC

Lake St Clair Forecast
National Weather Service Detroit/Pontiac MI
954 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.

LCZ460-202200-
Lake St Clair-
954 AM EDT Mon Jul 20 2026

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

.REST OF TODAY...South winds 5 to 10 knots increasing to 10 to 15
knots in the afternoon. 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.

$$

CB

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

Graphical marine forecasts are available at weather.gov/greatlakes