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Mesoscale Discussion 675
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   MESOSCALE DISCUSSION 0675
   NWS STORM PREDICTION CENTER NORMAN OK
   0757 PM CDT FRI MAY 23 2014

   AREAS AFFECTED...SC

   CONCERNING...SEVERE THUNDERSTORM WATCH 178...179...

   VALID 240057Z - 240200Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   178...179...CONTINUES.

   SUMMARY...THE THREAT FOR DAMAGING WINDS AND LARGE HAIL CONTINUES
   WITHIN SRN PORTION OF SEVERE THUNDERSTORM WATCH 178...AND FOR THIS
   REASON...THE WATCH HAS BEEN LOCALLY EXTENDED UNTIL 04Z. SEVERE
   THUNDERSTORM WATCH 179 WILL BE ALLOWED TO EXPIRE AT 01Z.

   DISCUSSION...AS OF 0045Z...REGIONAL RADAR DATA INDICATED A CLUSTER
   OF TSTMS WITH EMBEDDED SUPERCELL STRUCTURES OVER
   RICHLAND...SUMTER...AND LEE COUNTIES IN SC MOVING 315/30 KT. THESE
   STORMS APPEAR TO HAVE ORGANIZED A COLD POOL OVER THE PAST HOUR OR SO
   WITH SOME ACCELERATION OF STORM MOTION NOTED. 00Z CHS SOUNDING
   REVEALED AN IMPRESSIVE ENVIRONMENT FOR THE REGION WITH STEEP LOW TO
   MIDLEVEL LAPSE RATES AND A MOIST BOUNDARY LAYER WITH MLCAPE OF
   AROUND 2500 J/KG. THIS INSTABILITY COINCIDES WITH A KINEMATIC
   ENVIRONMENT FEATURING AROUND 40 KT OF WSWLY DEEP-LAYER
   SHEAR...SUPPORTIVE OF SUPERCELL AND BOWING STRUCTURES.

   BASED ON LATEST RADAR TRENDS...IT IS POSSIBLE THAT FURTHER
   ACCELERATION MAY OCCUR TO THE ONGOING TSTM COMPLEX WITH THE THREAT
   FOR GOLF BALL-SIZE HAIL AND CORRIDORS OF WIND DAMAGE SPREADING SEWD
   TOWARD THE SC COAST NEAR OR NORTH OF CHS BY 0300-0330Z.

   ..MEAD.. 05/24/2014


   ATTN...WFO...RAH...ILM...CHS...CAE...GSP...

   LAT...LON   32287989 32508042 33038042 33518137 33888158 34008194
               34538167 34568129 34578090 34878080 34817991 34287949
               34287908 33627827 33147884 32757910 32287989 

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Page last modified: May 24, 2014
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