MESOSCALE DISCUSSION 0060
   NWS STORM PREDICTION CENTER NORMAN OK
   0342 PM CST MON JAN 28 2013
   
   AREAS AFFECTED...CASCADES OF WA AND NRN ORE
   
   CONCERNING...HEAVY SNOW 
   
   VALID 282142Z - 290315Z
   
   SUMMARY...SNOW RATES WILL INCREASE TO 1-2 IN/HR FOR ELEVATIONS AOA
   2-2.5 KFT BY 00Z...WITH SIMILAR RATES CONTINUING INTO THE EVENING
   HOURS.
   
   DISCUSSION...A RIBBON OF MODESTLY ENHANCED DEEP MOISTURE...
   HIGHLIGHTED BY 0.50-0.65-INCH PW VALUES PER GPS DATA...EXTENDS SEWD
   INTO THE PACIFIC NW FROM THE FAR E PACIFIC. AND GIVEN THE ONGOING
   UPSLOPE FLOW REGIME...REGIONAL MOSAIC RADAR IMAGERY AND SFC OBS
   INDICATE WIDESPREAD PRECIPITATION OCCURRING...ESPECIALLY OVER THE
   WRN SLOPES OF THE CASCADES. AS A MID-LEVEL SHORTWAVE TROUGH
   CONTINUES MOVING SEWD OVER BRITISH COLUMBIA...UPSLOPE FLOW IS
   FORECAST TO STRENGTHEN OVER THE CASCADES LATER THIS AFTERNOON INTO
   THIS EVENING. RTX VWP DATA DURING THE LAST COUPLE OF HOURS INDICATE
   A SUBTLE INCREASE IN THE FLOW BELOW 3 KM AGL...POTENTIALLY IN
   ASSOCIATION WITH THE ONSET OF THE STRENGTHENING UPSLOPE FLOW. THE
   MORE MARKED INCREASE IN UPSLOPE FLOW IS ANTICIPATED BY 00Z...WITH A
   CORRESPONDING INCREASE IN PRECIPITATION RATES. AS SUCH...SNOW RATES
   WILL LIKELY REACH 1-2 IN/HR BY 00Z FOR ELEVATIONS AOA 2-2.5 KFT.
   THESE RATES ARE FORECAST TO CONTINUE THROUGHOUT THE EVENING HOURS.
   ADDITIONALLY...STRENGTHENING SFC WINDS SHOULD YIELD REDUCED
   VISIBILITIES IN AREAS OF BLOWING/DRIFTING SNOW.
   
   ..COHEN.. 01/28/2013
   
   
   ATTN...WFO...OTX...PDT...SEW...PQR...
   
   LAT...LON   48992117 48862064 48222047 47822059 47232085 46672116
               46012144 45252155 44752168 44642203 44922221 45152218
               45332213 45682214 45952228 46192235 46652231 47142192
               47552175 48052182 48662209 48972193 48992117