MESOSCALE DISCUSSION 0583
   NWS STORM PREDICTION CENTER NORMAN OK
   0304 PM CDT SUN MAY 16 2010
   
   AREAS AFFECTED...OKLAHOMA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 176...
   
   VALID 162004Z - 162100Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 176
   CONTINUES.
   
   THREAT OF LARGE HAIL UP TO THE SIZE OF SOFTBALLS AND ISOLATED
   TORNADOES CONTINUES OVER OKLAHOMA.
   
   BRIEF SUBSIDENCE IN THE WAKE OF THE EARLIER UPPER WAVE HAS NOW
   PASSED...AND AN UPPER WAVE IN N CNTRL OK/S CNTRL KS IS BECOMING
   REINFORCED BY A VORT MAX TO THE WEST. STORM CHARACTERISTICS HAVE
   CERTAINLY REFLECTED INCREASED UPPER SUPPORT...WITH THE STORM IN
   KINGFISHER COUNTY EXHIBITING SUPERCELLULAR STRUCTURE...AND SOFTBALL
   SIZED HAIL HAS BEEN REPORTED. ALTHOUGH EFFECTIVE SHEAR REMAINS
   SOMEWHAT WEAK /35 KT/...COOL TEMPERATURES ALOFT AND MODERATE
   INSTABILITY HAVE BEEN SUFFICIENT FOR ORGANIZED STORMS. THE
   KINGFISHER COUNTY STORM MAY CONTINUE ALONG A WEAK BOUNDARY NOTED ON
   VISIBLE IMAGERY FROM NEAR GAGE ESEWD TOWARD MCALESTER. ADDITIONAL
   DEVELOPMENT IS OCCURRING TO THE SOUTHWEST OF THIS STORM ALONG A
   DECAYING SW TO NE ORIENTED OUTFLOW BOUNDARY. THESE STORMS MAY
   DEVELOP FURTHER AS THEY MOVE INTO GREATER INSTABILITY ACROSS SRN OK.
   
   ..HURLBUT.. 05/16/2010
   
   
   ATTN...WFO...TSA...OUN...
   
   LAT...LON   36339597 35469526 34779630 34949767 34989901 35229925
               35699932 36139862 36389758 36339597