MESOSCALE DISCUSSION 1433
   NWS STORM PREDICTION CENTER NORMAN OK
   0620 PM CDT SAT JUL 04 2009
   
   AREAS AFFECTED...SERN OK/PART OF WEST CENTRAL AR
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 545...
   
   VALID 042320Z - 050015Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 545
   CONTINUES.
   
   REGIONAL RADAR SHOWED A COMPLEX OF STRONG TSTMS ALONG A SRN OK
   OUTFLOW BOUNDARY /JOHNSTON TO ATOKA COUNTIES IN SERN EXTENT OF WW
   546/...WITH STORMS ALONG ERN EXTENT OF THIS COMPLEX TENDING TO
   WEAKEN AS THEY TRACK INTO SWRN PORTION OF WW 545.  MEANWHILE...
   ADDITIONAL TSTMS ARE DEVELOPING ALONG ANOTHER SURFACE BOUNDARY
   EXTENDING WNW-ESE FROM KINGFISHER COUNTY OK TO WRN AR.
   
   AIR MASS ALONG AND N OF THE SRN OK OUTFLOW BOUNDARY IS MODERATELY
   UNSTABLE WITH EFFECTIVE BULK SHEAR OF 30-45 KT.  THIS SUGGESTS TSTMS
   SHOULD HAVE A POTENTIAL TO BECOME STRONG TO SEVERE ACROSS ERN OK TO
   FAR WRN AR THROUGH THE EARLY EVENING.
   
   ..PETERS.. 07/04/2009
   
   
   ATTN...WFO...LZK...SHV...TSA...OUN...
   
   LAT...LON   34109565 34709597 35179593 35639492 35619388 35119297
               34869329 34449442 34139531 34109565