MESOSCALE DISCUSSION 0211
   NWS STORM PREDICTION CENTER NORMAN OK
   0720 PM CST SUN FEB 24 2013
   
   AREAS AFFECTED...NERN NM...TX AND OK PANHANDLES...EXTREME SWRN KS
   
   CONCERNING...HEAVY SNOW 
   
   VALID 250120Z - 250715Z
   
   SUMMARY...HEAVY SNOW WILL DEVELOP ACROSS MUCH OF THE SOUTHERN HIGH
   PLAINS FROM NORTHEAST NM INTO THE TX AND OK PANHANDLES.  SNOW RATES
   COULD EXCEED ONE INCH PER HOUR WITHIN HEAVIER THUNDERSTORMS.
   
   DISCUSSION...INTENSE HEIGHT FALLS ARE SPREADING ACROSS THE SRN HIGH
   PLAINS THIS EVENING AHEAD OF POWERFUL SRN ROCKIES UPPER LOW.  LATEST
   SATELLITE IMAGERY SUPPORTS THIS WITH RAPID MID LEVEL CLOUD
   DEVELOPMENT OCCURRING ACROSS THE TX SOUTH PLAINS NEAR THE LEE TROUGH
   WITHING VERY STEEP LAPSE RATE ENVIRONMENT.  FARTHER
   NORTH...CONVECTION IS DEEPENING/EXPANDING NORTH OF POLAR SURGE WHERE
   SFC TEMPERATURES HAVE DROPPED INTO THE LOWER 30S JUST NORTH OF THE
   WIND SHIFT.
   
   00Z SOUNDING FROM AMA EXHIBITS VERY STEEP MID LEVEL LAPSE RATES AND
   WEAK ELEVATED INSTABILITY CERTAINLY SUPPORTIVE OF CONVECTION ROOTED
   ABOVE 700MB.  LATEST LIGHTNING DATA SUPPORTS THIS EVOLUTION WITH
   TSTMS NOW INCREASING ACROSS THE SERN TX PANHANDLE AND MORE ISOLATED
   ACTIVITY DEEPER BEHIND THE COLD FRONT INTO NERN NM.  GIVEN THE LARGE
   SCALE FORCING AND STRENGTHENING UPSLOPE FLOW INTO NERN NM...VERY
   HEAVY SNOW...LIKELY ACCOMPANIED BY LIGHTNING...WILL INCREASE ACROSS
   THE CANADIAN ESCARPMENT INTO THE TX PANHANDLE.  ICE PELLETS MAY
   INITIALLY MIX ACROSS THE ERN TX PANHANDLE INTO NWRN OK BEFORE THE
   CHANGEOVER TO SNOW AROUND 06Z.
   
   ..DARROW.. 02/25/2013
   
   
   ATTN...WFO...OUN...DDC...LUB...AMA...ABQ...
   
   LAT...LON   36160567 36420260 37410060 37019972 35150034 34610180
               34810369 35260454 35350578 36160567