MESOSCALE DISCUSSION 0101
   NWS STORM PREDICTION CENTER NORMAN OK
   1003 AM CST WED FEB 09 2011
   
   AREAS AFFECTED...ERN OK...FAR NE TX...AR...NRN LA...WRN TN...NW MS
   
   CONCERNING...HEAVY SNOW 
   
   VALID 091603Z - 092200Z
   
   SNOWFALL WILL GRADUALLY INCREASE IN THE ARKLATEX AND LOWER TO MID-MS
   VALLEY THIS AFTERNOON. SNOWFALL RATES SHOULD REACH 1 INCH PER HOUR
   ACROSS CNTRL AND ERN AR...NW MS AND WRN TN. A MIX OF RAIN...SLEET
   AND SNOW SHOULD EXIST FROM FAR NE TX EWD ACROSS FAR NRN LA INTO
   WCNTRL MS.
   
   A LARGE AREA OF SNOW IS CURRENTLY ONGOING ACROSS ERN OK AND AR
   LOCATED ALONG AND TO THE EAST OF A WELL-DEFINED INVERTED SFC TROUGH.
   EAST OF THE SFC TROUGH SFC WINDS ARE NELY WHICH COMBINED WITH WARM
   ADVECTION AND STRONG ISENTROPIC LIFT WILL CREATE CONDITIONS
   FAVORABLE FOR HEAVY SNOW THIS AFTERNOON. THE HEAVIEST SNOW IS
   LOCATED IN ERN OK AND NW AR JUST AHEAD OF A VORTICITY MAX IN NE OK.
   THE ASSOCIATED UPPER-LEVEL TROUGH WILL MOVE EWD ACROSS OK INCREASING
   LARGE-SCALE ASCENT ACROSS THE OZARKS. THIS SHOULD RESULT IN A
   GRADUAL INCREASE IN SNOWFALL RATES ACROSS CNTRL AND SRN AR LATER
   THIS AFTERNOON WITH UP TO 1 INCH PER HOUR RATES BECOMING LIKELY
   ESPECIALLY AFTER 18Z.
   
   FURTHER TO THE SOUTH FROM NE TX ENEWD ACROSS FAR NRN LA INTO NCNTRL
   MS...SFC TEMPS CURRENTLY RANGE FROM AROUND 32 F IN NCNTRL MS TO THE
   MID TO UPPER 30S F IN THE VICINITY OF SHREVEPORT LA. HOWEVER...NORTH
   TO NELY SFC WINDS SHOULD ENABLE SFC TEMPS TO DROP BELOW FREEZING
   ACROSS MOST OF THIS CORRIDOR THIS AFTERNOON. FORECAST SOUNDINGS
   ACROSS NRN LA AND NCNTRL MS SHOW MOST OF THE COLUMN WILL BE BELOW
   FREEZING SUGGESTING RAIN SHOULD QUICKLY CHANGEOVER TO SLEET AND MAY
   BE MIXED WITH SNOW. AS SFC TEMPS COOL LATER THIS AFTERNOON...A
   TRANSITION TO ALL SNOW APPEARS LIKELY AND 1 INCH PER HOUR SNOWFALL
   RATES MAY OCCUR.
   
   ..BROYLES.. 02/09/2011
   
   
   ATTN...WFO...OHX...PAH...MEG...JAN...LZK...SHV...TSA...FWD...
   
   LAT...LON   34989529 36139399 36429088 36338852 35478796 34458847
               33119007 32539187 32309356 32319474 33029550 33799568
               34989529