MESOSCALE DISCUSSION 0023
   NWS STORM PREDICTION CENTER NORMAN OK
   0645 PM CST FRI JAN 05 2007
   
   AREAS AFFECTED...CASCADES OF WA/NRN ORE ABOVE 3500 FT
   
   CONCERNING...HEAVY SNOW 
   
   VALID 060045Z - 060645Z
   
   HEAVY SNOW WITH RATES UP TO 2 INCH/HR WILL CONTINUE TO DEVELOP SWD
   THROUGH WA CASCADES INTO THE NRN ORE CASCADES THROUGH 06Z. SNOW
   LEVELS WILL CONTINUE TO SLOWLY RISE TO AROUND 3500 FT THROUGH THE
   EVENING. STRONG WINDS WILL LEAD TO NEAR BLIZZARD CONDITIONS AT TIMES
   IN THE HIGHEST ELEVATIONS.
   
   A VERY DYNAMIC SHORTWAVE TROUGH WILL CONTINUE TO APPROACH THE COAST
   OF SRN BRITISH COLUMBIA AND WA OVER THE NEXT 6 HOURS. AHEAD OF THIS
   SHORTWAVE...STRONG WARM ADVECTION /PER THE 00Z SLE SOUNDING/ COUPLED
   WITH STRONG SWLY /UPSLOPE/ LOW LEVEL FLOW AND UPPER LEVEL DIVERGENCE
   WILL SUPPORT A VERY STRONG VERTICAL MOTION PROFILE OVER WA AND NRN
   ORE CASCADES DURING THE NEXT 6+ HRS. BASED ON PRESENT SYSTEM
   MOTION...THE STRONGEST VERTICAL MOTION FIELDS WILL OCCUR OVER THE
   NRN WA CASCADES THROUGH 06Z...WHILE GRADUALLY DEVELOPING SWD INTO
   THE SRN WA/NRN ORE CASCADES BETWEEN 03-06Z AS THE UPPER DIVERGENCE
   MAXIMUM AND MID LEVEL COLD FRONT MOVE SEWD. GIVEN THE STRENGTH OF
   THE MESOSCALE FORCING...SNOWFALL RATES UP TO 2 INCH/HR WILL BE
   COMMONPLACE FOR MORE THAN A 6 HR PERIOD ESPECIALLY ACROSS THE WRN
   SLOPES. SNOWFALL LEVELS /PRESENTLY AROUND 2500 FT/ WILL CONTINUE TO
   RISE TO AROUND 3500 FT /PER THE UIL 00Z SOUNDING/ OVER THE NEXT FEW
   HRS UNDER THE PRESENCE OF CONTINUED STRONG WAA. A STRONG SFC
   PRESSURE/HEIGHT GRADIENT WILL SUPPORT SUSTAINED SSWLY WINDS FROM
   20-30 MPH WITH GUSTS OVER 40 MPH...LEADING TO NEAR BLIZZARD
   CONDITIONS AT TIMES IN THE HIGHEST TERRAIN.
   
   ..CROSBIE.. 01/06/2007
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
   SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
   TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
   FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
   
   ATTN...WFO...OTX...PDT...SEW...PQR...
   
   48812098 48792167 48542189 47992186 46982174 46232200
   45692206 45242216 44702242 44472205 44512171 45352150
   46662104 47682095 48522088