MESOSCALE DISCUSSION 0011
   NWS STORM PREDICTION CENTER NORMAN OK
   1119 PM CST MON JAN 05 2004
   
   AREAS AFFECTED...NWRN OREGON...WRN WASHINGTON
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 060519Z - 060915Z
   
   ...SNOW WILL INCREASE IN INTENSITY WEST OF THE CASCADE RANGE OVER
   THE NEXT FEW HOURS.  FREEZING RAIN WILL ALSO SPREAD NWD ACROSS THE
   WILLAMETTE VALLEY...
   
   BROAD WARM CONVEYOR BELT OF DEEPER PRECIPITATION IS SHIFTING EWD
   WITH LEADING EDGE OF THIS ACTIVITY NOW SPREADING ONSHORE ACROSS
   PORTIONS OF WRN ORE/WA.  STRONG PRESSURE GRADIENT DUE TO POLAR HIGH
   EAST OF THE CASCADES WILL CONTINUE TO FORCE COLD AIR INTO THE
   WILLAMETTE VALLEY REGION BENEATH GRADUALLY WARMING MID LEVEL COLUMN.
    ALTHOUGH MUCH OF THE INITIAL PRECIPITATION WILL BEGIN AS SNOW
   ACROSS ORE...FORECAST SOUNDINGS STRONGLY SUGGEST SNOW WILL CHANGE TO
   FREEZING RAIN AROUND 07Z FROM SOUTH...NEAR EUGENE...TO
   NORTH...AROUND PORTLAND BY 12Z.  ALL BUT EXTREME SWRN COASTAL AREAS
   OF WA WILL MAINTAIN SNOW PROFILE THROUGH 12Z.  SNOW RATES WILL
   APPROACH 1 INCH PER HOUR IN THE VALLEYS WITH HEAVY ICING EXPECTED
   ACROSS THE SRN WILLAMETTE VALLEY.
   
   ..DARROW.. 01/06/2004
   
   
   ATTN...WFO...SEW...PQR...
   
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