MESOSCALE DISCUSSION 0573
   NWS STORM PREDICTION CENTER NORMAN OK
   1007 PM CDT TUE APR 24 2007
   
   AREAS AFFECTED...PORTIONS SW/CENTRAL/NE TX...EXTREME SERN OK...SWRN
   AR.
   
   CONCERNING...TORNADO WATCH 176...179...
   
   VALID 250307Z - 250430Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 176...179...CONTINUES.
   
   SVR POTENTIAL OVER PORTIONS N-CENTRAL/NE TX...AND RIO GRANDE VALLEY
   TO SAT REGION...SHOULD PERSIST AFTER SCHEDULED 4Z EXPIRATION TIME
   FOR THESE WWS.  THEREFORE ADDITIONAL/REPLACEMENT WW ISSUANCES MAY BE
   REQUIRED FOR THOSE REGIONS.
   
   AIR MASS FROM CENTRAL TX NEWD INTO SRN AR SHOULD SUPPORT CONTINUED
   DAMAGING WIND THREAT WITH BOW ECHOES NOW EVIDENT NEAR PRX...AND OVER
   SRN PORTIONS DFW METROPLEX.  KINEMATIC PROFILES AS EVIDENT FROM PAT
   PROFILER AND SHV VWP INDICATE FAVORABLE SHEAR TO SUSTAIN SVR THREAT
   EWD ACROSS MORE OF NE TX AND SRN AR...AND ALSO...FOR SOME TORNADO
   POTENTIAL WITH EMBEDDED MESOCIRCULATIONS.  DEVELOPMENT OF 50-60 KT
   SWLY LLJ WILL CONTINUE TO YIELD LARGE LOW LEVEL HODOGRAPHS...E.G.
   0-1 KM SRH 200-300 J/KG.  MODIFIED FWD RAOB AND RUC SOUNDINGS
   SUGGEST EFFECTIVE INFLOW PARCELS WILL REMAIN ROOTED AT OR VERY NEAR
   SFC FOR OBSERVED DEW POINTS LOW-MID 60S F.
   
   FARTHER SW...DAMAGING/TORNADIC EAGLE PASS SUPERCELL IS DISSIPATING S
   SAT AS IT MOVES INTO PROGRESSIVELY MORE STOUT CAPPING...HOWEVER
   ADDITIONAL DEVELOPMENT IS OCCURRING IN LOW LEVEL WAA REGIME FARTHER
   W.  SCATTERED TSTMS SHOULD CONTINUE TO MOVE GENERALLY ESEWD ACROSS
   AREAS BETWEEN SAT-EAGLE PASS-COT...SOME OF WHICH MAY BECOME
   SUPERCELLS WITH DAMAGING HAIL AND SVR GUST POTENTIAL.  AS WITH
   EARLIER ACTIVITY...LIMITING FACTOR WITH EWD EXTENT WILL CONTINUE TO
   BE STRONG CINH...AS EVIDENT IN 00Z CRP RAOB.  HOWEVER...THIS MAY BE
   COUNTERACTED NEAR AND W OF I-35 BY STRONG LIFT ALONG OUTFLOW
   BOUNDARIES.
   
   ..EDWARDS.. 04/25/2007
   
   
   ATTN...WFO...SHV...TSA...HGX...FWD...CRP...EWX...SJT...
   
   29360101 31699828 33679611 34209420 33359389 32839397
   32129489 30709661 28929814 28279901 28069998