MESOSCALE DISCUSSION 0440
   NWS STORM PREDICTION CENTER NORMAN OK
   0754 PM CDT FRI APR 10 2009
   
   AREAS AFFECTED...CNTRL SC...FAR SRN NC
   
   CONCERNING...TORNADO WATCH 135...
   
   VALID 110054Z - 110200Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 135 CONTINUES.
   
   SUPERCELLS EMBEDDED WITHIN QLCS ACROSS UPSTATE SC/NERN GA SHOULD
   PROGRESS EWD WITH ATTENDANT THREATS FOR DAMAGING WINDS...ISOLATED
   TORNADOES AND HAIL. HOWEVER...THE ERN EXTENT OF THE SEVERE THREAT
   APPEARS UNCERTAIN GIVEN WEAKER INSTABILITY. AREA DOWNSTREAM OF WW
   135 IS BEING MONITORED FOR EITHER A NEW WW OR POSSIBLE WFO AREAL
   EXTENSION.
   
   AS 0045Z...RADAR IMAGERY DEPICTED A QLCS STRETCHING FROM CHEROKEE
   COUNTY SC TO CLARKE COUNTY GA WITH SEVERAL EMBEDDED MESOCYCLONES AND
   BOWING SEGMENTS. THE OVERALL TREND FOR A LINEAR CONVECTIVE MODE
   SUGGESTS THAT DAMAGING WINDS SHOULD BECOME THE PRIMARY SEVERE
   THREAT...ALTHOUGH 0-1 KM SRH AOA 300 M2/S2 WILL SUPPORT POTENTIAL
   FOR ISOLATED TORNADOES. CURRENT QLCS TRACK SHOULD APPROACH THE ERN
   EXTENT OF WW 135 AROUND 02Z. HOWEVER...THE SEVERE THREAT SHOULD WANE
   FARTHER E AS THE ACTIVITY PROGRESSES E OF ANSON COUNTY NC TO
   ALLENDALE SC OWING TO AN APPARENT MARINE LAYER BOUNDARY NOTED
   EARLIER ON VIS/RADAR IMAGERY. INSTABILITY SHOULD BE QUITE LACKING E
   OF THIS LINE /AS DEPICTED IN 00Z CHS RAOB/. THUS...THERE IS
   UNCERTAINTY WHETHER A NEW WW WILL NEED TO BE ISSUED OR WHETHER A
   WFO-AREAL EXTENSION OF A FEW COUNTIES IN CNTRL SC WILL BE NEEDED.
   
   ..GRAMS.. 04/11/2009
   
   
   ATTN...WFO...RAH...ILM...CHS...CAE...GSP...FFC...
   
   LAT...LON   35098152 35168040 34977945 34427927 33138027 32608115
               32688203 33328254 34098255 34108244 35098152