MESOSCALE DISCUSSION 0770
   NWS STORM PREDICTION CENTER NORMAN OK
   0903 PM CDT FRI MAY 08 2009
   
   AREAS AFFECTED...NRN AND CNTRL TX
   
   CONCERNING...TORNADO WATCH 272...
   
   VALID 090203Z - 090400Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 272 CONTINUES.
   
   SCATTERED SUPERCELLS HAVE FORMED ACROSS TOR WATCH 272 AND SHOULD
   PERSIST FOR SEVERAL MORE HOURS. 00Z FWD SOUNDING SHOWED A TREMENDOUS
   INSTABILITY PROFILE WITH MUCAPE NEAR 5000 J/KG AND MID LEVEL LAPSE
   RATES NEAR DRY ADIABATIC.
   
   ORIENTATION OF THE DEEP LAYER SHEAR VECTORS HAS ALLOWED STORMS TO
   MOVE OFF THE INITIATION ZONE INTO THE WARM SECTOR. ALTHOUGH MID
   LEVEL FLOW IS RATHER MODEST AT 20-30 KT...SEWD STORM MOTION INTO A
   SLY 30 KT LOW LEVEL JET AS WELL AS STRONG INSTABILITY SHOULD ALLOW
   CELLS TO PRODUCE SIG HAIL AND WIND FOR SEVERAL MORE HOURS. THE
   TORNADO THREAT IS LIMITED LARGELY DUE TO MARGINAL LOW LEVEL
   SHEAR...BUT AN ISOLATED TORNADO CANNOT BE RULED OUT WITH THE
   STRONGER CELLS.
   
   ..JEWELL.. 05/09/2009
   
   
   ATTN...WFO...FWD...OUN...EWX...SJT...MAF...
   
   LAT...LON   30919838 30939961 31089958 31040069 31510070 31510131
               31590127 31580085 31700082 31660021 32100022 32100016
               32540016 32529961 32999961 32989898 33429894 33419840
               34089843 34139813 34019803 33909797 33979769 33819732
               33749711 33919693 33449692 33419680 33019685 33009650
               32549650 32549710 32259713 32079757 31919734 31759735
               31729735 31589758 31709768 31469817 31049789 31049785
               31019848 30919838