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000
FZUS63 KDTX 201953
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
353 PM EDT MON MAY 20 2013

.SYNOPSIS...A LARGE LOW PRESSURE SYSTEM...AVERAGING 29.40
INCHES...WILL STALL OVER THE NORTHERN PLAINS BRINGING SEVERAL
ROUNDS OF SHOWERS AND THUNDERSTORMS THROUGH MIDWEEK. THIS LOW
WILL PASS THROUGH THE SOUTHERN GREAT LAKES LATE IN THE WEEK ALLOWING
HIGH PRESSURE TO BUILD BACK IN FROM THE NORTH.

LCZ460-210800-
LAKE ST CLAIR-
353 PM EDT MON MAY 20 2013

...SEVERE THUNDERSTORM WATCH 189 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

.TONIGHT...SOUTHEAST WINDS 5 TO 10 KNOTS THROUGH MIDNIGHT...BECOMING
LIGHT AND VARIABLE OVERNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS
THROUGH MIDNIGHT...THEN SHOWERS AND THUNDERSTORMS LIKELY AFTER
MIDNIGHT. PARTLY CLOUDY. WAVES 2 FEET OR LESS.
.TUESDAY...SOUTH WINDS 5 TO 10 KNOTS...BECOMING SOUTHWEST 10 TO
15 KNOTS LATE. SHOWERS AND THUNDERSTORMS LIKELY THROUGH EARLY
AFTERNOON...THEN SHOWERS AND THUNDERSTORMS BY MID AFTERNOON. WAVES
2 FEET OR LESS.
.TUESDAY NIGHT...SOUTHWEST WINDS 5 TO 10 KNOTS THROUGH MIDNIGHT...
BECOMING LIGHT AND VARIABLE OVERNIGHT. PARTLY CLOUDY WITH A CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES 2 FEET OR LESS.
.WEDNESDAY...SOUTH WINDS 5 TO 10 KNOTS...INCREASING TO 10 TO
15 KNOTS BY MID AFTERNOON. CLOUDY WITH SHOWERS AND THUNDERSTORMS
LIKELY. WAVES 2 FEET OR LESS.
.WEDNESDAY NIGHT...WEST WINDS 5 TO 10 KNOTS. LIGHT SHOWERS LIKELY.
MOSTLY CLOUDY THROUGH MIDNIGHT...BECOMING PARTLY CLOUDY OVERNIGHT.
WAVES 2 FEET OR LESS.
.THURSDAY...NORTHWEST WINDS 5 TO 10 KNOTS...BECOMING NORTH 10 TO
15 KNOTS BY MID AFTERNOON. MOSTLY CLOUDY WITH A CHANCE OF LIGHT
SHOWERS. WAVES 2 FEET OR LESS.
.FRIDAY...NORTHEAST WINDS 5 TO 10 KNOTS. MOSTLY CLEAR. WAVES 2 FEET
OR LESS.
.SATURDAY...LIGHT AND VARIABLE WINDS. MOSTLY CLEAR. WAVES 2 FEET OR
LESS.

$$

MR

WAVES ARE THE SIGNIFICANT WAVE HEIGHT - THE AVERAGE OF THE HIGHEST
1/3 OF THE WAVE SPECTRUM. MAXIMUM WAVE HEIGHT IS THE HIGHEST 1/20
WAVE HEIGHT.

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