MESOSCALE DISCUSSION 2411
   NWS STORM PREDICTION CENTER NORMAN OK
   1011 PM CST SAT NOV 12 2005
   
   AREAS AFFECTED...SERN OK...SRN MO...WRN AR
   
   CONCERNING...TORNADO WATCH 860...
   
   VALID 130411Z - 130545Z
   
   SEVERE THREAT PERSISTS ACROSS PARTS OF TORNADO WATCH 860 LATE THIS
   EVENING.
   
   A COUPLE OF SQUALL LINES WITH EMBEDDED MESOCYCLONES AND COOLING
   CLOUD TOPS HAVE MOVED OFF THE DRYLINE AND SHOULD CONTINUE TO POSE A
   THREAT OF SEVERE WEATHER OVER THE NEXT 1-2 HOURS. MOIST AIR MASS
   AHEAD OF THIS ACTIVITY FROM SWRN AR NEWD TO SRN MO WAS CONTRIBUTING
   TO MODEST SURFACE-BASED INSTABILITY WHICH SHOULD SUSTAIN UPDRAFTS
   ALONG EWD ADVANCING COLD POOLS. MID LEVEL FLOW OF 40-65 KT WAS
   RESULTING IN DEEP LAYER SHEAR SUITABLE FOR CONTINUED STORM
   ORGANIZATION. BREAKS OR CELLS WITHIN TRAILING PORTIONS OF EXISTING
   SQUALL LINES MAY ACQUIRE ROTATION WITH ISOLATED TORNADO STILL
   POSSIBLE GIVEN 0-1KM SRH IN EXCESS OF 300 M2/S2 PER DEQUEEN AR
   PROFILER.
   
   ..CARBIN.. 11/13/2005
   
   
   ATTN...WFO...PAH...LSX...LZK...SGF...SHV...TSA...FWD...OUN...
   
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