MESOSCALE DISCUSSION 0688
   NWS STORM PREDICTION CENTER NORMAN OK
   1044 PM CDT SAT MAY 18 2013
   
   AREAS AFFECTED...A PORTION OF S-CNTRL / CNTRL / AND NERN OK
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 190344Z - 190415Z
   
   PROBABILITY OF WATCH ISSUANCE...40 PERCENT
   
   SUMMARY...THE THREAT FOR CONVECTIVELY-INDUCED SEVERE WIND GUSTS
   CAPABLE OF ISOLD POCKETS OF WIND DAMAGE WILL PROBABLY CONTINUE FOR
   THE NEXT SEVERAL HOURS.  A NEW SEVERE THUNDERSTORM WATCH IS BEING
   CONSIDERED FOR PORTIONS OF OK.
   
   DISCUSSION...A CLUSTER OF ELEVATED TSTMS LOCATED FROM THE WICHITA
   MTNS TO THE OKC METRO AND RECENT ADDITIONAL STORM DEVELOPMENT IN
   OSAGE COUNTY CONTINUES TO LEND A THREAT FOR STRONG-SEVERE WIND
   GUSTS.  DESPITE A GUST FRONT SURGING WELL AHEAD OF THE ONGOING STORM
   CLUSTER...THE CONVECTIVE DOWNDRAFTS CONTINUE TO PENETRATE TO THE
   SURFACE IN THE FORM OF STRONG-SEVERE MEASURED WIND GUSTS PER
   MULTIPLE OK MESONET OBSERVATIONS.  GIVEN THE VERY STEEP LAPSE RATE
   ENVIRONMENT COUPLED WITH A 50+ KT LLJ...EVAPORATIVE COOLING
   PROCESSES WILL BE CONDUCIVE FOR SPORADIC DOWNDRAFT BURSTS TO
   PROBABLY CONTINUE TO FACILITATE POCKETS OF DAMAGING-CAPABLE WIND
   GUSTS.
   
   ..SMITH/CORFIDI.. 05/19/2013
   
   
   ATTN...WFO...TSA...OUN...
   
   LAT...LON   34739877 35609747 36789679 36989544 36409546 35069582
               34649679 34739877