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401
FZUS63 KDTX 200702
GLFSC

Lake St Clair Forecast
National Weather Service Detroit/Pontiac MI
302 AM 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...A weak low pressure system follows a stalled front
from the central Plains into the Ohio Valley this weekend. A
broad area of high pressure then builds into northern Ontario and
the northern Great Lakes Sunday into Monday.

LCZ460-201515-
Lake St Clair-
302 AM EDT Sun Sep 20 2026

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

.TODAY...Northeast winds 10 to 15 knots. Patchy fog in the morning.
Showers early in the morning...then a chance of light showers in the
late morning and early afternoon. Locally heavy rainfall possible
early in the morning. Waves 2 feet or less.
.TONIGHT...Northeast winds 15 to 20 knots increasing to 20 to 25
knots in the late evening and overnight. Partly cloudy. Waves 2 to 4
feet.
.MONDAY...Northeast winds 20 to 25 knots diminishing to 15 to 20
knots in the late morning and afternoon. Partly sunny. Waves 1 to 3
feet.
.MONDAY NIGHT...Northeast winds 20 to 25 knots increasing to 30
knots in the late evening and overnight. Mostly cloudy. Waves 2 to 4
feet.
.TUESDAY...Northeast winds 20 to 25 knots diminishing to 15 to 20
knots with gusts to 30 knots in the afternoon...then increasing to
30 knots with gusts to 35 knot gales in the evening. Partly sunny in
the morning becoming mostly cloudy. Waves 2 to 4 feet building to 3
to 5 feet in the evening. Waves occasionally around 7 feet. A Gale
Warning may be needed.
.WEDNESDAY...East winds to 30 knots with gusts to 35 knot gales.
Mostly cloudy with a chance of showers. Waves 2 to 4 feet.
.THURSDAY...East winds 20 to 25 knots. Partly cloudy. Waves 2 to 4
feet.

$$

MR

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

Graphical marine forecasts are available at weather.gov/greatlakes