Great Lakes Forecast
Issued by NWS

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FZUS63 KDTX 190800
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
400 AM EDT FRI SEP 19 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...HIGH PRESSURE...30.30 INCHES...WILL MOVE FROM QUEBEC TO
THE ATLANTIC COAST TODAY. THE NEXT LOW PRESSURE SYSTEM...AVERAGING
29.50 INCHES...WILL THEN SLIDE ACROSS CENTRAL CANADA AND THE
NORTHERN GREAT LAKES FRIDAY NIGHT THROUGH SUNDAY MORNING. THE LOW
WILL PULL A COLD FRONT THROUGH LAKE HURON AND LOWER MICHIGAN DURING
SATURDAY AND SATURDAY NIGHT WHICH WILL TRIGGER SHOWERS AND
THUNDERSTORMS BEFORE COOLER AIR ARRIVES WITH HIGH PRESSURE TO START
NEXT WEEK.

LCZ460-192015-
LAKE ST CLAIR-
400 AM EDT FRI SEP 19 2014

.TODAY...LIGHT AND VARIABLE WINDS...BECOMING SOUTH 5 TO 10 KNOTS BY
MID AFTERNOON. SUNNY. WAVES 2 FEET OR LESS.
.TONIGHT...SOUTH WINDS 5 TO 10 KNOTS...INCREASING TO 10 TO 15 KNOTS
LATE. MOSTLY CLEAR. WAVES 2 FEET OR LESS.
.SATURDAY...SOUTHWEST WINDS 15 TO 20 KNOTS. A CHANCE OF SHOWERS BY
MID AFTERNOON. PARTLY SUNNY. WAVES 1 TO 3 FEET.
.SATURDAY NIGHT...SOUTHWEST WINDS 10 TO 15 KNOTS...INCREASING TO
15 TO 20 KNOTS BY MIDNIGHT...THEN DIMINISHING TO 10 TO 15 KNOTS
LATE. SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS THROUGH
MIDNIGHT...THEN A CHANCE OF SHOWERS AFTER MIDNIGHT. CLOUDY. WAVES
2 FEET OR LESS.
.SUNDAY...NORTHWEST WINDS 10 TO 15 KNOTS. PARTLY SUNNY WITH A CHANCE
OF SHOWERS...THEN PARTLY CLOUDY THROUGH MIDNIGHT. WAVES 2 FEET OR
LESS.
.MONDAY...WEST WINDS 10 TO 15 KNOTS. MOSTLY CLEAR. WAVES 2 FEET OR
LESS.
.TUESDAY...NORTHEAST 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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