MESOSCALE DISCUSSION 1084
   NWS STORM PREDICTION CENTER NORMAN OK
   0650 PM CDT FRI JUN 12 2009
   
   AREAS AFFECTED...PORTIONS OF OK
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 122350Z - 130045Z
   
   A CONDITIONAL SEVERE THREAT CONTINUES ALONG STATIONARY FRONT THAT
   BISECTS OK. IF SUSTAINED TSTMS DO DEVELOP...A WW WOULD LIKELY BE
   NEEDED GIVEN THE PRESENCE OF A VERY UNSTABLE AIR MASS JUXTAPOSED
   WITH STRONG DEEP-LAYER SHEAR.
   
   23Z SUBJECTIVE SURFACE ANALYSIS PLACED A STATIONARY FRONT AXIS FROM
   AROUND 30 NW CSM TO OKC TO 30 N DEQ. RECENT VISIBLE SATELLITE
   IMAGERY DEPICT CONGESTED/BUILDING CU/TCU ALONG PORTIONS OF THE
   BOUNDARY...PRIMARILY INVOF DEWEY/CUSTER AND LINCOLN/POTTAWATOMIE
   COUNTIES. MODIFIED 17Z OUN RAOB SUGGESTS AT LEAST A WEAK CAPPING
   INVERSION LIKELY REMAINS OVER AT LEAST CNTRL/ERN OK. WITH MID-LEVEL
   HEIGHTS CONTINUING TO RISE THROUGH THIS EVENING...UNCERTAINTY
   REMAINS OVER WHETHER SUSTAINED TSTM DEVELOPMENT WILL OCCUR.
   NEVERTHELESS...THE COMBINATION OF EFFECTIVE SHEAR OF 40-50 KT AND
   STRONG INSTABILITY WITH MLCAPE AOA 2500 J/KG WOULD PROMOTE
   SUPERCELLS WITH LARGE HAIL...DAMAGING WINDS AND ISOLATED TORNADOES.
   
   ..GRAMS.. 06/12/2009
   
   
   ATTN...WFO...TSA...FWD...OUN...
   
   LAT...LON   35599615 35099508 34559504 33969603 33869713 34459838
               34699927 35469964 35959964 36199928 36139793 35939680
               35599615