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545
FZUS63 KDTX 201943
GLFSC

Lake St Clair Forecast
National Weather Service Detroit/Pontiac MI
343 PM EDT Sun Sep 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, 30.40 inches, over northern Ontario
will build southeast early this week. This will lead to prolong
moderate northeast winds over the central Great Lakes.

LCZ460-210345-
Lake St Clair-
343 PM EDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING
THROUGH WEDNESDAY EVENING...

.TONIGHT...Northeast winds 15 to 20 knots increasing to 20 to 25
knots in the late evening and overnight. Mostly cloudy. Waves 1 to 3
feet building to 2 to 4 feet after midnight.
.MONDAY...Northeast winds 20 to 25 knots diminishing to 15 to 20
knots in the late morning and afternoon. Mostly cloudy. Waves 2 to 4
feet subsiding to 1 to 3 feet in the late morning and afternoon.
.MONDAY NIGHT...Northeast winds 20 to 25 knots increasing to 30
knots by midnight...then diminishing to 20 to 25 knots after
midnight. Partly cloudy. Waves 2 to 4 feet.
.TUESDAY...Northeast winds 20 to 25 knots diminishing to 15 to 20
knots early in the afternoon. Partly sunny. Waves 2 to 4 feet
subsiding to 1 to 3 feet in the late morning and afternoon.
.TUESDAY NIGHT...Northeast winds to 30 knots with gusts to 35 knot
gales. Mostly cloudy. Waves 3 to 5 feet. Waves occasionally around 7
feet. A Gale Warning may be needed.
.WEDNESDAY...Northeast winds 20 to 25 knots becoming east 15 to 20
knots in the afternoon...then increasing to 20 to 25 knots in the
evening. Partly sunny in the morning...then partly cloudy with a
chance of light showers in the afternoon and evening. Waves 2 to 4
feet.
.THURSDAY...East winds 20 to 25 knots. Partly cloudy. Waves 1 to 3
feet.
.FRIDAY...Northeast winds 10 to 15 knots. Mostly clear. Waves 2 feet
or less.

$$

KDK

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

Graphical marine forecasts are available at weather.gov/greatlakes