880
FZUS63 KDTX 201955
GLFSC

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

LCZ460-210400-
Lake St Clair-
355 PM EDT Mon Jul 20 2026

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

.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 light showers likely and a chance of
thunderstorms after midnight. Mostly cloudy with a chance of light
showers 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 becoming west 15 to 20
knots in the late morning and afternoon. Partly sunny. A chance of
light showers in the morning...then a chance of showers and
thunderstorms in the afternoon. Patchy smoke late in the afternoon.
Waves 2 to 4 feet subsiding to 1 to 3 feet in the 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. Patchy smoke
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 diminishing to 10 to 15
knots. Partly sunny. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 10 to 15 knots diminishing to 5 to 10
knots after midnight. Clear. Waves 2 feet or less.
.THURSDAY...Northwest winds 5 to 10 knots in the morning becoming
light and variable...then becoming south 5 to 10 knots in the
evening. Clear. Waves 2 feet or less.
.FRIDAY...Southeast winds 5 to 10 knots. Mostly clear. Waves 2 feet
or less.
.SATURDAY...South winds 5 to 10 knots. Clear. Waves 2 feet or less.

$$

MV

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

Graphical marine forecasts are available at weather.gov/greatlakes