Great Lakes Forecast
Issued by NWS

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FZUS63 KDTX 271942
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
342 PM EDT THU APR 27 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...LOW PRESSURE...29.30 INCHES...WILL TRACK FROM THE U.P. TO NORTHERN
ONTARIO TONIGHT. WEAK HIGH PRESSURE WILL BUILD INTO LOWER MICHIGAN
ON FRIDAY BEFORE SURFACE HIGH PRESSURE...CENTERED OVER
ONTARIO...STRENGTHENS OVER THE NORTHERN GREAT LAKES ON SATURDAY.
OVER THE SOUTHERN GREAT LAKES...A FRONTAL BOUNDARY WILL DEVELOP AND
BRING PERIODS OF SHOWERS AND THUNDERSTORMS LATE SATURDAY THROUGH
SUNDAY AS IT LIFTS NORTH.

LCZ460-280815-
LAKE ST CLAIR-
342 PM EDT THU APR 27 2017

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM EDT THIS EVENING...

.TONIGHT...SOUTHWEST WINDS 15 TO 20 KNOTS WITH GUSTS TO 25 KNOTS
DIMINISHING TO 5 TO 10 KNOTS. PARTLY CLOUDY BECOMING MOSTLY CLOUDY
LATE THIS EVENING BECOMING PARTLY CLOUDY. WAVES 2 FEET OR LESS.
.FRIDAY...SOUTHWEST WINDS 5 TO 10 KNOTS BECOMING SOUTH 10 TO 15
KNOTS LATE IN THE AFTERNOON. MOSTLY CLOUDY. WAVES 2 FEET OR LESS.
.FRIDAY NIGHT...SOUTH WINDS 5 TO 10 KNOTS UNTIL EARLY MORNING
BECOMING LIGHT AND VARIABLE. MOSTLY CLOUDY WITH A CHANCE OF LIGHT
SHOWERS. WAVES 2 FEET OR LESS.
.SATURDAY...NORTH WINDS 10 TO 15 KNOTS. CLOUDY WITH A CHANCE OF
LIGHT SHOWERS. WAVES 2 FEET OR LESS.
.SATURDAY NIGHT...NORTHEAST WINDS 10 TO 15 KNOTS. CLOUDY. A CHANCE
OF LIGHT SHOWERS IN THE EVENING...THEN SHOWERS LIKELY AFTER
MIDNIGHT. WAVES 2 FEET OR LESS.
.SUNDAY...SOUTHEAST WINDS 10 TO 15 KNOTS DIMINISHING TO 5 TO 10
KNOTS IN THE EVENING. CLOUDY. SHOWERS LIKELY AND A CHANCE OF
THUNDERSTORMS. WAVES 2 FEET OR LESS.
.MONDAY...SOUTHWEST WINDS 15 TO 20 KNOTS WITH GUSTS TO 30 KNOTS.
MOSTLY CLOUDY WITH SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS.
WAVES 1 TO 3 FEET. A SMALL CRAFT ADVISORY MAY BE NEEDED.
.TUESDAY...WEST WINDS 20 TO 25 KNOTS WITH GUSTS TO 30 KNOTS. MOSTLY
CLOUDY WITH A CHANCE OF SHOWERS. WAVES 1 TO 3 FEET.

$$

SF

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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