Weather Advisory...

posted Nov 17, 2011, 5:40 PM by smike@guemesfire.org   [ updated Nov 17, 2011, 5:41 PM ]
1142 AM PST THU NOV 17 2011

...A MIX OF RAIN AND SNOW SHOWERS POSSIBLE ACROSS THE LOWLANDS OF WESTERN WASHINGTON LATE TONIGHT THROUGH SATURDAY. ACCUMULATION IS POSSIBLE AT SOME LOCATIONS LATE TONIGHT INTO EARLY FRIDAY MORNING AND AGAIN EARLY SATURDAY MORNING...

A COLD UPPER TROUGH MOVING SOUTHWARD ALONG THE BRITISH COLUMBIA COAST WILL SETTLE OVER WESTERN WASHINGTON BY EARLY FRIDAY MORNING. THIS TROUGH WILL PRODUCE SHOWERS AND BRING VERY COLD AIR ALOFT INTO THE AREA. TEMPERATURES NEAR THE SURFACE WILL BE COLD ENOUGH FOR A MIX OF SNOW WITH RAIN SHOWERS ACROSS MOST AREAS THROUGH SATURDAY. HOWEVER...HIGHER HILL TOPS AND AREAS WITH PERSISTENT OR HEAVY SHOWERS COULD SEE LIGHT ACCUMULATIONS OF SNOW...

WHILE MOST AREAS WILL NOT SEE ANY ACCUMULATION OF SNOW... MODEL
GUIDANCE CONTINUES TO INDICATE THE POSSIBILITY OF A CONVERGENCE ZONE
DEVELOPING SOMEWHERE NORTH OF SEATTLE LATE TONIGHT INTO EARLY FRIDAY
MORNING. IF THIS DEVELOPS AND PERSISTS LONG ENOUGH...ACCUMULATIONS
OF AN INCH OR TWO COULD BE POSSIBLE ANYWHERE FROM SEATTLE TO MOUNT
VERNON...

ANOTHER SYSTEM PASSING TO THE SOUTH OF THE AREA EARLY SATURDAY
MORNING WILL BRING AN ADDITIONAL THREAT OF LOWLAND SNOW MAINLY TO
THE SOUTH SOUND AND SOUTHWEST INTERIOR. THERE REMAINS SOME
UNCERTAINTY CONCERNING THE TRACK OF THIS SYSTEM...WHICH AFFECTS THE
POTENTIAL FOR ACCUMULATING SNOW. THERE IS ENOUGH POTENTIAL FOR SNOW
ACCUMULATION OVER PARTS OF THE SOUTHERN INLAND AREAS THAT IT
WARRANTS MENTION...

COLDER TEMPERATURES ARE EXPECTED ACROSS WESTERN WASHINGTON THROUGH
THE WEEKEND WITH WIDESPREAD LOW TEMPERATURES FALLING INTO THE LOW
30S TONIGHT AND INTO THE MID 20S TO AROUND 30 DEGREES SATURDAY
MORNING. AS A RESULT WET ROADWAYS MAY ICE UP TONIGHT AND WILL LIKELY
ICE UP SATURDAY MORNING...PRODUCING POTENTIALLY HAZARDOUS DRIVING
CONDITIONS. COLD MORNING TEMPERATURES WILL OCCUR AGAIN ON SUNDAY
MORNING WITH MODERATING TEMPERATURES DURING THE AFTERNOON.
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