MESOSCALE DISCUSSION 1072
   NWS STORM PREDICTION CENTER NORMAN OK
   0938 AM CDT FRI JUN 12 2009
   
   AREAS AFFECTED...PARTS OF CNTRL AND SRN AR INTO NRN MS
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 121438Z - 121545Z
   
   SEVERE STORMS WILL BE POSSIBLE THIS MORNING IN ADVANCE OF OK BOW
   ECHO.  A WW WILL LIKELY BE REQUIRED AS THE BOW ECHO MOVES OUT OF WW
   387 BY LATE MORNING...THOUGH THIS ISSUANCE MAY BE NEEDED SOONER
   SHOULD DEVELOPING DOWNSTREAM STORMS CONTINUE TO INTENSIFY. 
   ALSO...AN UPGRADE TO MODERATE RISK IS BEING CONSIDERED ACROSS PARTS
   OF THE DISCUSSION AREA FOR THE UPCOMING 1630Z ISSUANCE.
   
   A NW-SE ORIENTED BAND OF TSTMS ARE SLOWLY TRYING TO BECOME ORGANIZED
   FROM N OF MLC TO SW OF PBF WITHIN A ZONE OF BROAD LOW-LEVEL WAA PER
   REGIONAL VWPS AND PROFILERS.  12Z OUN/SHV/LIT SOUNDINGS INDICATED
   THE PRESENCE OF A VERY MOIST BOUNDARY LAYER...STEEP MIDLEVEL LAPSE
   RATES AND A DECREASING CAP WITH EWD EXTENT.  RESULTANT MUCAPES
   RANGED FROM 3000-4000 J/KG.
   
   AS SHORT WAVE TROUGH CONTINUES EWD THROUGH THE CNTRL PLAINS...IT IS
   ANTICIPATED THAT AT LEAST WEAK LOW-LEVEL WAA WILL CONTINUE TODAY TO
   THE N OF STATIONARY BOUNDARY WHICH EXTENDED FROM CNTRL OK SEWD
   THROUGH SRN AR INTO NRN MS AS OF 14Z.  GIVEN THE ALREADY STRONGLY
   UNSTABLE AIR MASS IN PLACE...THERE IS REASON TO BELIEVE THAT
   CURRENTLY DEVELOPING STORMS MAY CONTINUE TO INTENSIFY WITHIN
   KINEMATIC ENVIRONMENT FEATURING 40-50 KT OF EFFECTIVE BULK SHEAR. 
   AS SUCH...THE POTENTIAL WILL EXIST FOR SUPERCELL AND/OR BOWING
   STRUCTURES TO DEVELOP DOWNSTREAM FROM OK BOW ECHO.
   
   ..MEAD.. 06/12/2009
   
   
   ATTN...WFO...MEG...JAN...LZK...
   
   LAT...LON   33959303 34219364 34569413 35039400 35559350 35699220
               35609146 35279090 34779025 34099020 33709051 33619141
               33959303