Great Lakes Forecast
Issued by NWS

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FZUS63 KDTX 211941 RRA
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
339 PM EDT SUN MAY 21 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...A LOW PRESSURE SYSTEM...AVERAGING 29.70 INCHES...OVER
LAKE SUPERIOR WILL LIFT SLOWLY NORTHEASTWARD INTO ONTARIO ON MONDAY.
MEANWHILE HIGH PRESSURE...AVERAGING 30.00 INCHES...OVER THE OHIO
VALLEY WILL BUILD INTO THE EASTERN GREAT LAKES ON MONDAY. A SECOND
LOW WILL THEN DEVELOP OVER LAKE MICHIGAN ON TUESDAY.

LCZ460-220800-
LAKE ST CLAIR-
339 PM EDT SUN MAY 21 2017

.TONIGHT...SOUTHWEST WINDS 5 TO 10 KNOTS VEERING TO THE WEST AFTER
MIDNIGHT...THEN INCREASING TO 10 TO 15 KNOTS EARLY IN THE MORNING.
MOSTLY CLOUDY THIS EVENING BECOMING PARTLY CLOUDY. A CHANCE OF
SHOWERS AND THUNDERSTORMS EARLY IN THE EVENING. WAVES 2 FEET OR
LESS.
.MONDAY...WEST WINDS 10 TO 15 KNOTS. PARTLY SUNNY. WAVES 2 FEET OR
LESS.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 15 KNOTS DIMINISHING TO 5 TO
10 KNOTS IN THE LATE EVENING AND OVERNIGHT. PARTLY CLOUDY. WAVES 2
FEET OR LESS.
.TUESDAY...SOUTH WINDS 5 TO 10 KNOTS. PARTLY SUNNY. WAVES 2 FEET OR
LESS.
.TUESDAY NIGHT...EAST WINDS 5 TO 10 KNOTS UNTIL EARLY MORNING
BECOMING LIGHT AND VARIABLE. PARTLY CLOUDY BECOMING MOSTLY CLOUDY IN
THE LATE EVENING AND EARLY MORNING BECOMING PARTLY CLOUDY. WAVES 2
FEET OR LESS.
.WEDNESDAY...EAST WINDS 5 TO 10 KNOTS. MOSTLY CLOUDY. A CHANCE OF
LIGHT SHOWERS IN THE MORNING...THEN LIGHT SHOWERS LIKELY IN THE
AFTERNOON AND EVENING. WAVES 2 FEET OR LESS.
.THURSDAY...WEST WINDS 5 TO 10 KNOTS. PARTLY CLOUDY. LIGHT SHOWERS
LIKELY. WAVES 2 FEET OR LESS.
.FRIDAY...SOUTHWEST WINDS 5 TO 10 KNOTS. PARTLY CLOUDY. WAVES 2 FEET
OR LESS.

$$

HLO

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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