Great Lakes Forecast
Issued by NWS

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903
FZUS63 KDTX 201500
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1000 AM EST MON FEB 20 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...HIGH PRESSURE...30.40 INCHES...WILL MOVE FROM NORTHERN
ONTARIO THIS MORNING TO QUEBEC BY EVENING. DEEPENING LOW PRESSURE
MOVING FROM MANITOBA TO NORTHERN QUEBEC TONIGHT WILL DRIVE A SURFACE
FRONT...AVERAGE PRESSURE 29.90 INCHES...FROM THE UPPER MIDWEST THIS
AFTERNOON TO LAKE HURON TUESDAY AFTERNOON. A FRONTAL BOUNDARY IS
FORECAST TO DROP INTO THE NORTHERN GREAT LAKES ON WEDNESDAY WITH
DEEPENING LOW PRESSURE FORECAST TO TRACK ALONG THE FRONT AND
NORTHEAST OF LAKE HURON BY THURSDAY MORNING.

LCZ460-202115-
LAKE ST CLAIR-
1000 AM EST MON FEB 20 2017

.REST OF TODAY...SOUTHEAST WINDS 5 TO 10 KNOTS. PARTLY SUNNY. WAVES
2 FEET OR LESS.
.TONIGHT...SOUTHEAST WINDS 10 TO 15 KNOTS. PARTLY CLOUDY UNTIL EARLY
MORNING...BECOMING MOSTLY CLOUDY. WAVES 2 FEET OR LESS.
.TUESDAY...SOUTHEAST WINDS 10 TO 15 KNOTS...BECOMING SOUTHWEST 5 TO
10 KNOTS IN THE LATE MORNING AND AFTERNOON. MOSTLY CLOUDY WITH LIGHT
SHOWERS LIKELY. WAVES 2 FEET OR LESS.
.TUESDAY NIGHT...SOUTHWEST WINDS 5 TO 10 KNOTS. PARTLY CLOUDY. WAVES
2 FEET OR LESS.
.WEDNESDAY...SOUTHWEST WINDS 5 TO 10 KNOTS...BECOMING SOUTH 10 TO
15 KNOTS IN THE EVENING. MOSTLY SUNNY...BECOMING PARTLY CLOUDY.
WAVES 2 FEET OR LESS.
.THURSDAY...NORTHEAST WINDS 10 TO 15 KNOTS. PARTLY CLOUDY. A CHANCE
OF RAIN. WAVES 2 FEET OR LESS.
.FRIDAY...SOUTH WINDS 10 TO 15 KNOTS. SHOWERS WITH THUNDERSTORMS
LIKELY. WAVES 2 FEET OR LESS.

$$

SF

EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/DTX/GLFTABLESC (ALL LOWER CASE)

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



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