Great Lakes Forecast
Issued by NWS

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000
FZUS63 KDTX 201945
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
345 PM EDT SAT SEP 20 2014

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 AVERAGING 29.70 INCHES WILL SLOWLY WORK
THROUGH THE CENTRAL GREAT LAKES TONIGHT...TRIGGERING SHOWERS AND
STRONG THUNDERSTORMS...FOLLOWED BY A STRONGER COLD FRONT SUNDAY.
THERE WILL BE A CHANCE FOR MORE THUNDERSTORMS SUNDAY INTO SUNDAY
EVENING BEFORE THE WIND TURNS FROM THE NORTH AND BRING COOLER AND
LESS HUMID AIR BACK INTO THE REGION. THE NORTHERLY FLOW WILL BUILD
WAVES OVER THE SOUTH HALF OF LAKE HURON UNTIL HIGH PRESSURE SETTLES
IN FOR THE MIDDLE OF THE WEEK.

LCZ460-210800-
LAKE ST CLAIR-
345 PM EDT SAT SEP 20 2014

.TONIGHT...SOUTHWEST WINDS 10 TO 15 KNOTS WITH GUSTS TO 20
KNOTS...DIMINISHING TO 5 TO 10 KNOTS AFTER MIDNIGHT. LIGHT SHOWERS
LIKELY AND A CHANCE OF THUNDERSTORMS EARLY THIS EVENING...THEN A
CHANCE OF LIGHT SHOWERS BY MIDNIGHT. MOSTLY CLOUDY. WAVES 2 FEET OR
LESS.
.SUNDAY...SOUTHWEST WINDS 5 TO 10 KNOTS...BECOMING NORTHWEST 10 TO
15 KNOTS BY LATE MORNING...THEN BECOMING NORTH 15 TO 20 KNOTS LATE.
OCCASIONAL SHOWERS AND A CHANCE OF THUNDERSTORMS. WAVES 2 FEET OR
LESS.
.SUNDAY NIGHT...NORTH WINDS 15 TO 20 KNOTS. A CHANCE OF LIGHT
SHOWERS THROUGH MIDNIGHT. MOSTLY CLOUDY...BECOMING PARTLY CLOUDY
AFTER MIDNIGHT...BECOMING MOSTLY CLOUDY. WAVES 2 FEET OR LESS.
.MONDAY...NORTHWEST WINDS 10 TO 15 KNOTS...DIMINISHING TO 5 TO
10 KNOTS BY MID AFTERNOON. PARTLY SUNNY. WAVES 2 FEET OR LESS.
.MONDAY NIGHT...WEST WINDS 5 TO 10 KNOTS. MOSTLY CLEAR. WAVES 2 FEET
OR LESS.
.TUESDAY...SOUTHWEST WINDS 5 TO 10 KNOTS...BACKING TO THE EAST
THROUGH MIDNIGHT. MOSTLY CLEAR. WAVES 2 FEET OR LESS.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 10 KNOTS. MOSTLY CLEAR. WAVES
2 FEET OR LESS.
.THURSDAY...SOUTHEAST WINDS 5 TO 10 KNOTS. MOSTLY CLEAR. WAVES
2 FEET OR LESS.

$$

SF

GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT
WEATHER.GOV/GREATLAKES (ALL LOWER CASE)






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