668
FZUS63 KDTX 210738
GLFSC

Lake St Clair Forecast
National Weather Service Detroit/Pontiac MI
338 AM EDT Tue Jul 21 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...A cold front tracks across the Great Lakes late
tonight, with potential for strong to severe thunderstorms in its
wake. A second cold front then sweeps across the area Tuesday
evening, bringing a brief period of gusts to gale force. High
pressure fills in mid-week for a drier pattern to end the work
week.

LCZ460-211545-
Lake St Clair-
338 AM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING...

.TODAY...Southwest winds 20 to 25 knots becoming west 15 to 20 knots
in the afternoon. Partly sunny. A chance of showers and
thunderstorms early in the morning. Light showers likely and a
chance of thunderstorms in the afternoon. Patchy smoke late in the
afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late
morning and afternoon.
.TONIGHT...Northwest winds 15 to 20 knots increasing to 20 to 25
knots with gusts to 30 knots in the late evening and overnight.
Mostly clear. 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 after midnight.
.WEDNESDAY...Northwest winds 20 to 25 knots diminishing to 10 to 15
knots. Mostly 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...North winds 5 to 10 knots in the morning becoming light
and variable...then becoming southeast 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. 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