MESOSCALE DISCUSSION 2103
   NWS STORM PREDICTION CENTER NORMAN OK
   1120 PM CDT FRI OCT 09 2009
   
   AREAS AFFECTED...NE CO...SW NEB
   
   CONCERNING...HEAVY SNOW 
   
   VALID 100420Z - 100815Z
   
   HEAVY SNOWFALL WILL BE POSSIBLE TONIGHT ACROSS NE CO...SE WY INTO
   WRN AND CNTRL NEB. SOME SPOTS APPEAR LIKELY TO RECEIVE SNOWFALL
   RATES OF 1-2 INCHES PER HOUR.
   
   WATER VAPOR IMAGERY CURRENTLY SHOWS AN ENHANCEMENT OF CLOUD TOPS
   OVER SE WY AND WRN NEB WHERE THE RUC IS ANALYZING A WELL-DEFINED
   VORTICITY MAX. SOUTH OF THE VORTICITY MAX...FORECAST SOUNDINGS
   SUGGEST MOISTURE IN THE LOW TO MID-LEVELS IS MAXIMIZED WITH GPS-WX
   DATA SUGGESTING PRECIPITATELY WATER VALUES ARE AS HIGH AS .50 INCHES
   ACROSS NE CO. IN ADDITION...SFC WINDS MAY BECOME MORE VEERED WITH
   TIME ACROSS WRN NEB AND NE CO HELPING TO ENHANCE ISENTROPIC LIFT AND
   UPSLOPE FLOW ACROSS THE REGION. SHORT-TERM MODEL FORECASTS GENERATE
   PRECIPITATION TOTALS OF .4 TO .6 INCHES FROM NOW THROUGH ABOUT 12Z
   ACROSS MUCH OF THE MCD AREA SUGGESTING SNOWFALL RATES OF 1 TO 2
   INCHES PER HOURS WILL BE POSSIBLE IN SOME SPOTS. THIS HAS BEEN
   CONFIRMED ACROSS PARTS OF SRN WY WHERE NOAA MESONET DATA SHOWS
   OBSERVED 3 HOUR PRECIPITATION OF .7 TO .8 INCHES IN THE MEDICINE
   BOWS AND THE SNOWY RANGE. IN ADDITION...SFC WINDS ARE ALREADY IN THE
   20 TO 30 KT RANGE ACROSS MUCH OF THE CNTRL HIGH PLAINS BEHIND THE
   COLD FRONT AND THIS WILL CAUSE ADDITIONAL PROBLEMS WITH BLOWING
   SNOW. THE WINDS SHOULD REMAIN STRONG THROUGH LATE TONIGHT BUT THE
   SNOWFALL SHOULD TAPER OFF SLOWLY FROM WEST TO EAST ACROSS THE MCD
   AREA AS THE SHORTWAVE TROUGH MOVES AWAY FROM THE REGION.
   
   ..BROYLES.. 10/10/2009
   
   
   ATTN...WFO...LBF...GLD...BOU...CYS...
   
   LAT...LON   41680356 41720275 41710146 41410094 41040073 40650059
               40160110 39840207 39790306 39630389 39700435 39790489
               40710532 41190513 41520441 41680356