MESOSCALE DISCUSSION 0882
   NWS STORM PREDICTION CENTER NORMAN OK
   0235 PM CDT THU MAY 30 2013

   AREAS AFFECTED...CNTRL/ERN OK...WRN AR...FAR SWRN MO

   CONCERNING...TORNADO WATCH 252...253...

   VALID 301935Z - 302030Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 252...253...CONTINUES.

   SUMMARY...GREATEST TORNADO THREAT EXISTS NEXT COUPLE OF HOURS WITH
   SEMI-DISCRETE SUPERCELLS ACROSS CNTRL INTO NERN OK AND SUPERCELLS
   EMBEDDED WITHIN A BROADER CLUSTER ACROSS FAR SERN OK/WRN AR. LARGE
   HAIL IS ALSO POSSIBLE WITH THE WRN SUPERCELLS.

   DISCUSSION...LOW-LEVEL WIND PROFILES ARE STRONGEST AND MOST
   FAVORABLE FOR TORNADOES IN ERN OK/WRN AR PER TULSA/FORT SMITH VWP
   DATA. HERE...0-1 KM SHEAR OF 30-35 KT HAS PERSISTED AND LARGELY IS
   AIDING IN THE DEVELOPMENT OF A FEW MODERATE TO STRONG MESOCYCLONES
   ACROSS FAR W-CNTRL AR. CONTINUED WAA ATOP SHALLOW CONVECTIVE OUTFLOW
   SHOULD FOSTER RENEWED UPDRAFTS WITH A PERSISTENT RISK FOR A FEW
   TORNADOES.

   FARTHER W...SUPERCELLS ACROSS CNTRL OK HAVE PROGRESSED OFF THE
   DRYLINE INTO A STRONGLY UNSTABLE AIR MASS PER 18Z OUN RAOB. ALTHOUGH
   LOW-LEVEL WIND PROFILES ARE NOT QUITE AS FAVORABLE AS FARTHER
   E...THEY ARE STILL SUFFICIENT FOR A RISK OF TORNADO
   DEVELOPMENT...WHERE ONE MIGHT BECOME STRONG GIVEN THE DEGREE OF
   BUOYANCY. HOWEVER...WITH LARGE-SCALE DRYING/WARMING OCCURRING
   /INFERRED BY WATER VAPOR IMAGERY/...SUPERCELLS HAVE SHOWN EVIDENCE
   OF STRUGGLING TO BECOME VERY INTENSE.

   ..GRAMS.. 05/30/2013


   ATTN...WFO...LZK...SGF...SHV...TSA...ICT...FWD...OUN...

   LAT...LON   34679864 35779756 36609658 37199515 37249402 36219356
               35319365 35019327 34699297 34369307 33919365 33779425
               33819533 34509850 34679864