National Weather Service statement
The National Weather Service in Portland had this to say Monday morning:
547 AM PST MON MAR 5 2012
...COLDER WEATHER AND LOW ELEVATION SNOW POSSIBLE TONIGHT AND
EARLY TUESDAY MORNING...
A STRONG COLD FRONT WILL MOVE ACROSS SOUTHWEST WASHINGTON AND NORTHWEST
OREGON TODAY BRINGING MUCH COLDER AIR INTO THE REGION. HEAVY
PRECIPITATION WITH THE FRONT WILL DRAW THE SNOW LEVEL LOWER THAN
NORMAL DURING THE DAY TODAY AND IT IS POSSIBLE THAT SOME MIXED
RAIN AND SNOW MAY FALL AT THE HIGHER ELEVATIONS OF THE WILLAMETTE
VALLEY...CLARK COUNTY AND THE I-5 CORRIDOR.
SOME LOW ELEVATION SNOW IS POSSIBLE TONIGHT AS A WEAK DISTURBANCE
MOVES DOWN THE COAST OVER NORTHWEST OREGON AND SOUTHWEST
WASHINGTON. AT THIS TIME...MOISTURE IN THE VALLEYS APPEARS TO BE
LIMITED. SNOW SHOWERS ARE EXPECTED TO BE SPOTTY...WITH
ACCUMULATIONS OF UP TO 1 INCH...MOSTLY IN THE HILLS ABOVE 200
FEET. HOWEVER...IF MOISTURE BECOMES MORE ORGANIZED AFTER MIDNIGHT...
MORE SIGNIFICANT ACCUMULATIONS ARE POSSIBLE. IN THIS EVENT...THE
EARLY TUESDAY COMMUTE COULD BE AFFECTED. SHOWERS ARE EXPECTED TO
END TUESDAY MORNING WITH TEMPERATURES WARMING INTO THE MID 40S IN
THE VALLEYS TUESDAY. THIS WOULD ALLOW ANY SNOW THAT DOES FALL TO
QUICKLY MELT FOR IMPROVING CONDITIONS DURING THE LATE MORNING.
SEATTLE (AP) — Forecasters say the latest cold front moving through Washington will bring rain showers but not too much snow, except in the mountains.
A chance of snow for Western Washington lowlands that appeared possible in Sunday's forecast had largely changed to rain by Monday. But heavy snow is expected in the Cascades with 8 to 18 inches possible by Tuesday.
Meteorologist Mike McFarland in Seattle says there's a chance of a couple of inches of snow Tuesday morning in places like Lake Stevens and Granite Falls.
Forecasters expect a windy day Monday in Eastern Washington and a chance of rain or snow showers Monday night.
By mid-week the Weather Service sees mostly clear skies across the state and highs in the 50s. McFarland says it could hit 60 Thursday in Seattle.