MESOSCALE DISCUSSION 0013
   NWS STORM PREDICTION CENTER NORMAN OK
   0306 PM CST SUN JAN 09 2011
   
   AREAS AFFECTED...CNTRL AND N-CNTRL MS / W-CNTRL AL
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 092106Z - 100100Z
   
   INTENSIFYING MIXED PRECIP RATES ARE FORECAST TO DEVELOP OVER THE
   NEXT FEW HOURS ACROSS MS AND THEN SHIFT EWD INTO W-CNTRL AL BY EARLY
   EVENING.  HOURLY LIQUID EQUIVALENT PRECIP RATES RANGING FROM
   0.05-0.10 INCH ARE EXPECTED FOR SEVERAL HOURS WITH LOCALLY HIGHER
   RATES POSSIBLE.  
   
   EARLY AFTERNOON SATELLITE IMAGERY INDICATES THAT A ZONE OF STRONG
   DEEP LAYER ASCENT /DCVA/ IS MOVING ENEWD ACROSS THE SABINE RIVER
   VALLEY THIS AFTERNOON AND WILL MOVE ACROSS THE LOWER MS VALLEY THIS
   EVENING.  AHEAD OF THIS FEATURE...WARM CONVEYER UPGLIDE IS OCCURRING
   ABOVE A SHALLOW COLD DOME THAT IS CONTINUING TO DRAW COOL/DRY AIR
   INTO THE REGION FROM A SLOW TO ERODE SURFACE HIGH OVER THE OH
   VALLEY.  THUS...INITIAL MOISTENING IS OCCURRING IN THE MID-LEVELS AS
   SEEN BY JAN/BMX 12-18Z RAOBS.  RICHER MOISTURE CONTENT ALONG THE
   GULF COAST VICINITY HAS BEGUN TO GRADUALLY MOVE NWD INTO THE LOWER
   MS VALLEY PER REGIONAL RADAR MOSAIC DATA THE PAST FEW HOURS.  AS
   THIS OCCURS...EXPECT THE PRE-CONDITIONED COLUMN TO SATURATE QUICKLY
   AND RESULT IN WET-BULB COOLING AND ONSET OF APPRECIABLE PRECIP RATES
   /0.05-0.10 INCH PER HOUR/.  FORECAST SOUNDINGS INDICATE FREEZING
   RAIN WILL PRIMARILY BE THE PRECIP TYPE INVOF THE I-20 CORRIDOR WITH
   SLEET/SNOW FARTHER N AND NW NEAR HWY 82.
   
   ..SMITH.. 01/09/2011
   
   
   ATTN...WFO...BMX...MOB...MEG...JAN...
   
   LAT...LON   32248706 31858756 31799063 32139090 32969101 33359061
               33738825 33638737 32978686 32248706