MESOSCALE DISCUSSION 0578
   NWS STORM PREDICTION CENTER NORMAN OK
   1238 PM CDT MON APR 29 2013
   
   AREAS AFFECTED...COASTAL PORTIONS OF SOUTHEAST GA/SC
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 291738Z - 291915Z
   
   PROBABILITY OF WATCH ISSUANCE...5 PERCENT
   
   SUMMARY...TSTMS ARE LIKELY TO INCREASE IN COVERAGE/INTENSITY THROUGH
   EARLY/MID AFTERNOON ACROSS THE COASTAL PLAIN OF SC/SOUTHEAST
   GA...WITH POTENTIAL FOR ISOLATED BOUTS OF DAMAGING WINDS/SOME HAIL
   WITH THE STRONGEST STORMS. LOW SEVERE PROBABILITIES MAY BE ADDED
   WITH THE 20Z CONVECTIVE OUTLOOK UPDATE.
   
   DISCUSSION...AIDED BY A PASSING SOUTHEAST STATES IMPULSE/SUBTLE
   CYCLONIC FLOW ALOFT...TSTMS ARE LIKELY TO STEADILY INCREASE IN
   COVERAGE/INTENSITY OVER THE NEXT FEW HOURS ACROSS COASTAL PORTIONS
   OF SC/SOUTHEAST GA. THIS IS WHERE THE AIRMASS HAS AGGRESSIVELY
   DESTABILIZED WITHIN A 50-60 MILE WIDE CORRIDOR OF STRONGER
   INSOLATION/HEATING ALONG THE COASTAL PLAIN...TO THE EAST-SOUTHEAST
   OF THICKER UPSTATE CLOUD COVER. AS OF 17Z...CONTEMPORARY
   MODIFICATIONS TO THE 12Z OBSERVED SOUNDING FROM CHARLESTON SC
   SUPPORT AROUND 2000 J/KG OF SBCAPE COINCIDENT WITH VIRTUALLY NIL
   BOUNDARY LAYER INHIBITION. AIDED BY MODERATE SOUTHWESTERLY MID-LEVEL
   FLOW...AROUND 30-35 KT OF EFFECTIVE BULK SHEAR MAY CONTRIBUTE TO
   SOME SEMI-SUSTAINED MULTICELLS CAPABLE OF LOCALIZED DAMAGING
   WINDS/BOUT OF HAIL THROUGH THE AFTERNOON.
   
   ..GUYER/HART.. 04/29/2013
   
   
   ATTN...WFO...ILM...CHS...CAE...
   
   LAT...LON   31708119 32398161 33718034 33987932 33477879 31708119