MESOSCALE DISCUSSION 0652
   NWS STORM PREDICTION CENTER NORMAN OK
   1032 AM CDT FRI MAY 01 2009
   
   AREAS AFFECTED...NERN OK/NWRN AR
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 220...
   
   VALID 011532Z - 011630Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 220
   CONTINUES.
   
   COMPLEX MCS LOCATED OVER SERN KS/NERN OK/SWRN MO/NWRN AR REMAINS
   SOMEWHAT STATIONARY AS LLJ BEGINS TO WEAKEN AND VEER ACROSS OK. 
   INDIVIDUAL UPDRAFTS CONTINUE TO DEVELOP/EVOLVE ALONG WRN/SRN
   PERIPHERY OF PRECIP SHIELD...THE STRONGEST OF WHICH ARE LOCATED JUST
   NORTH OF THE FRONTAL ZONE OVER OK.  WITH MEAGER BOUNDARY LAYER
   HEATING EXPECTED ACROSS THE WATCH OVER THE NEXT FEW HOURS IT APPEARS
   WARM ADVECTION ATOP FRONTAL ZONE WILL REMAIN INFLUENTIAL IN UPDRAFT
   GENERATION/MAINTENANCE.  HAIL WILL CONTINUE TO BE THE PRIMARY SEVERE
   THREAT...ALTHOUGH HEAVY RAIN IS ALSO BECOMING A CONCERN GIVEN THIS
   REGION HAS RECEIVED A CONSIDERABLE AMOUNT OF PRECIP RECENTLY.
   
   ..DARROW.. 05/01/2009
   
   
   ATTN...WFO...LZK...TSA...OUN...
   
   LAT...LON   36949666 35959331 35109367 36299744 36949666