Great Lakes Forecast
Issued by NWS

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FZUS63 KDTX 200800
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
400 AM 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...LOW PRESSURE...AVERAGING 29.40 INCHES...ALONG THE NORTH
SHORE OF LAKE SUPERIOR TODAY WILL PULL A COLD FRONT THROUGH LAKE
HURON AND LOWER MICHIGAN TODAY AND TONIGHT. SHOWERS AND STRONG
THUNDERSTORMS WILL BE POSSIBLE ALONG AND AHEAD OF THIS FRONT...
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 BRINGS 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.

LCZ460-202015-
LAKE ST CLAIR-
400 AM EDT SAT SEP 20 2014

.TODAY...SOUTHWEST WINDS 15 TO 20 KNOTS. A CHANCE OF SHOWERS AND
THUNDERSTORMS BY EARLY AFTERNOON. SHOWERS LIKELY AND A CHANCE OF
THUNDERSTORMS LATE. PARTLY SUNNY. WAVES 1 TO 3 FEET.
.TONIGHT...SOUTHWEST WINDS 10 TO 15 KNOTS...DIMINISHING TO 5 TO
10 KNOTS AFTER MIDNIGHT. SHOWERS LIKELY AND A CHANCE OF
THUNDERSTORMS EARLY IN THE EVENING...THEN A CHANCE OF LIGHT
SHOWERS BY MIDNIGHT. MOSTLY CLOUDY. WAVES 2 FEET OR LESS.
.SUNDAY...SOUTHWEST WINDS 5 TO 10 KNOTS...BECOMING WEST 10 TO
15 KNOTS BY LATE MORNING. A CHANCE OF SHOWERS EARLY...THEN SHOWERS
LIKELY AND A CHANCE OF THUNDERSTORMS BY LATE MORNING. MOSTLY CLOUDY.
WAVES 2 FEET OR LESS.
.SUNDAY NIGHT...NORTHWEST WINDS 10 TO 15 KNOTS. MOSTLY CLOUDY WITH
SHOWERS LIKELY THROUGH MIDNIGHT...THEN MOSTLY CLEAR AFTER MIDNIGHT.
WAVES 2 FEET OR LESS.
.MONDAY...NORTHWEST WINDS 10 TO 15 KNOTS...DIMINISHING TO 5 TO
10 KNOTS BY MID AFTERNOON. MOSTLY CLEAR. WAVES 2 FEET OR LESS.
.TUESDAY...EAST WINDS 5 TO 10 KNOTS. MOSTLY CLEAR. WAVES 2 FEET OR
LESS.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 10 KNOTS. MOSTLY CLEAR. WAVES
2 FEET OR LESS.

$$

BT

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





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