MESOSCALE DISCUSSION 0038
   NWS STORM PREDICTION CENTER NORMAN OK
   1050 PM CST WED JAN 19 2011
   
   AREAS AFFECTED...NORTHERN HALF OF OK
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 200450Z - 200915Z
   
   A MIX OF FREEZING DRIZZLE/SOME SLEET WILL YIELD TO
   INCREASING/EASTWARD EXPANDING SNOW OVERNIGHT ACROSS THE NORTHERN
   HALF OF OK.
   
   WINTRY PRECIPITATION IS EXPECTED TO STEADILY INCREASE ACROSS THE
   NORTHERN HALF OF OK OVERNIGHT TO THE NORTH OF A SOUTHWARD ADVANCING
   SURFACE COLD FRONT. WITH AN INITIAL BOUT OF DRY AIR IN THE MID
   LEVELS...03Z RUC/00Z NAM FORECAST SOUNDINGS GENERALLY IMPLY AN
   INITIAL MIX OF FREEZING DRIZZLE/SOME SLEET. OF NOTE...A BAND OF
   CONVECTIVE PRECIPITATION CURRENTLY EVOLVING ACROSS WESTERN
   OK...EVIDENCED BY SOME CLOUD-GROUND LIGHTNING IN DEWEY COUNTY OK AND
   STEEP MID LEVEL LAPSE RATES AS DEDUCED FROM RUC SOUNDINGS...WILL BE
   CONDUCIVE FOR A RELATIVELY NARROW CORRIDOR OF SLEET AS ICE IS
   INTRODUCED ALOFT. OTHERWISE...SNOW WILL LIKELY BECOME MORE
   PREVALENT/EXPAND EASTWARD ACROSS NORTH CENTRAL AND
   NORTHEAST/EAST-CENTRAL OK THROUGH THE EARLY MORNING HOURS...WITH
   BOUTS OF MODERATE SNOW BECOMING MORE PROBABLE TOWARD 08Z-10Z AND
   BEYOND.
   
   ..GUYER.. 01/20/2011
   
   
   ATTN...WFO...TSA...OUN...
   
   LAT...LON   35409972 36549947 36829564 36209461 35299618 35159770
               35409972