Great Lakes Forecast
Issued by NWS

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000
FZUS63 KDTX 201342 RRA
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
942 AM EDT WED JUL 20 2016

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...RIDGE OF HIGH PRESSURE...AVERAGING 30.10 INCHES...WILL
BEGIN TO BREAK DOWN AND RETREAT TO THE MID ATLANTIC TODAY. A WEAK
SURFACE TROUGH...AT 29.80 INCHES...WILL TRAVERSE THE NORTHER GREAT
LAKES THURSDAY NIGHT. A WEAK SURFACE RIDGE AXIS OF 30.00 INCHES WILL
THEN BUILD INTO THE WESTERN AND CENTRAL GREAT LAKES BY SATURDAY.

LCZ460-202000-
LAKE ST CLAIR-
942 AM EDT WED JUL 20 2016

.REST OF TODAY...LIGHT AND VARIABLE WINDS...BECOMING SOUTHEAST 5 TO
10 KNOTS LATE. MOSTLY SUNNY. WAVES 2 FEET OR LESS.
.TONIGHT...SOUTH WINDS 5 TO 10 KNOTS THROUGH MIDNIGHT...BECOMING
LIGHT AND VARIABLE...THEN BECOMING SOUTH 5 TO 10 KNOTS LATE. MOSTLY
CLEAR. WAVES 2 FEET OR LESS.
.THURSDAY...SOUTHWEST WINDS 5 TO 10 KNOTS. MOSTLY SUNNY. WAVES
2 FEET OR LESS.
.THURSDAY NIGHT...SOUTHWEST WINDS 5 TO 10 KNOTS. PARTLY CLOUDY WITH
A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 2 FEET OR LESS.
.FRIDAY...SOUTH WINDS 5 TO 10 KNOTS...VEERING TO THE WEST THROUGH
MIDNIGHT. PARTLY SUNNY WITH A CHANCE OF SHOWERS AND THUNDERSTORMS...
THEN MOSTLY CLEAR THROUGH MIDNIGHT. WAVES 2 FEET OR LESS.
.SATURDAY...SOUTH WINDS 5 TO 10 KNOTS. MOSTLY CLEAR. A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES 2 FEET OR LESS.
.SUNDAY...SOUTHWEST WINDS 10 TO 15 KNOTS. PARTLY CLOUDY. A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES 2 FEET OR LESS.

$$

DG

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



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