Great Lakes Forecast
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591
FZUS63 KDTX 202030 RRA
GLFSC

Lake St Clair Forecast
National Weather Service Detroit/Pontiac MI
330 PM EST MON NOV 20 2017

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 system, 30.10 inches, will continue
to slide east through the Ohio Valley this afternoon, with an
extension of the ridge northward across the Great Lakes region. The
next low pressure system, 29.20 inches, will move east along the
southern tier of Canada to just north of Lake Superior late tonight.
Southwest winds will increase between the departing high and the
approaching low. The attendant cold front will clear the central
Great Lakes region Tuesday, ushering in another round of brisk
northwesterly flow. High pressure will regain a foothold on
Wednesday.

LCZ460-210900-
Lake St Clair-
330 PM EST MON NOV 20 2017

...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON...

.TONIGHT...Southwest winds 20 to 25 knots. Clear. Waves 2 to 4 feet.
.TUESDAY...Southwest winds 20 to 25 knots with gusts to 30 knots
diminishing to 15 to 20 knots late in the afternoon. Partly sunny
until late afternoon becoming cloudy. A chance of light showers 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 diminishing to 10 to
15 knots early in the morning. Cloudy with a chance of light showers
early in the evening...then partly cloudy with a chance of light
rain and snow showers in the late evening and early morning. Mostly
clear early in the morning. Waves 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 15 knots diminishing to 5 to 10
knots in the late morning and afternoon. Mostly sunny. Waves 2 feet
or less.
.WEDNESDAY NIGHT...Light and variable winds becoming southwest 5 to
10 knots in the late evening and overnight. Mostly clear. Waves 2
feet or less.
.THURSDAY...Southwest winds 10 to 15 knots. Partly cloudy becoming
mostly clear. Waves 2 feet or less.
.FRIDAY...Southwest winds 15 to 20 knots with gusts to 30 knots.
Partly cloudy. A chance of showers. Waves 2 feet or less. A Small
Craft Advisory may be needed.
.SATURDAY...Northwest winds 15 to 20 knots with gusts to 30 knots.
Mostly cloudy. Showers likely. Waves 1 to 3 feet.

$$

DG

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

Graphical marine forecasts are available at weather.gov/greatlakes



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