Great Lakes Forecast
Issued by NWS

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FZUS63 KDTX 190149
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
949 PM EDT TUE APR 18 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 AVERAGING 30.10 INCHES...CENTERED OVER THE
EASTERN GREAT LAKES WILL DEPART THE REGION TONIGHT. LOW
PRESSURE...29.60 INCHES...OVER WESTERN LAKE SUPERIOR WILL THEN
WEAKEN AS IT PUSHES FROM LAKE SUPERIOR INTO SOUTHERN ONTARIO THROUGH
WEDNESDAY. A SECOND LOW PRESSURE SYSTEM...29.60 INCHES...OVER THE
CENTRAL PLAINS ON WEDNESDAY WILL MOVE INTO THE LOWER PENINSULA ON
THURSDAY. HIGH PRESSURE...30.30 INCHES...WILL THEN SETTLE BACK IN
ACROSS MICHIGAN BY SATURDAY.

LCZ460-190830-
LAKE ST CLAIR-
949 PM EDT TUE APR 18 2017

.REST OF TONIGHT...SOUTHEAST WINDS 15 TO 20 KNOTS DIMINISHING TO 10
TO 15 KNOTS AFTER MIDNIGHT. PARTLY CLOUDY IN THE LATE EVENING AND
EARLY MORNING BECOMING MOSTLY CLOUDY. WAVES 2 FEET OR LESS.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 15 KNOTS. CLOUDY WITH A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES 2 FEET OR LESS.
.WEDNESDAY NIGHT...NORTHEAST WINDS 5 TO 10 KNOTS. CLOUDY. SHOWERS
AND THUNDERSTORMS LIKELY UNTIL EARLY MORNING...THEN A CHANCE OF
SHOWERS AND THUNDERSTORMS EARLY IN THE MORNING. WAVES 2 FEET OR
LESS.
.THURSDAY...SOUTH WINDS 10 TO 15 KNOTS VEERING TO THE SOUTHWEST LATE
IN THE AFTERNOON. CLOUDY WITH SHOWERS AND THUNDERSTORMS LIKELY.
WAVES 2 FEET OR LESS.
.THURSDAY NIGHT...WEST WINDS 10 TO 15 KNOTS. MOSTLY CLOUDY WITH
SHOWERS AND THUNDERSTORMS LIKELY EARLY IN THE EVENING...THEN PARTLY
CLOUDY IN THE LATE EVENING AND OVERNIGHT. WAVES 2 FEET OR LESS.
.FRIDAY...NORTHWEST WINDS 10 TO 15 KNOTS. PARTLY CLOUDY. WAVES 2
FEET OR LESS.
.SATURDAY...NORTHEAST WINDS 10 TO 15 KNOTS. PARTLY CLOUDY. WAVES 2
FEET OR LESS.
.SUNDAY...NORTHEAST WINDS 5 TO 10 KNOTS. PARTLY CLOUDY. WAVES 2 FEET
OR LESS.

$$

SC

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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