MESOSCALE DISCUSSION 0458
   NWS STORM PREDICTION CENTER NORMAN OK
   0405 AM CDT FRI APR 12 2013
   
   AREAS AFFECTED...CNTRL VA
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 120905Z - 121030Z
   
   CORRECTED TYPO
   
   PROBABILITY OF WATCH ISSUANCE...60 PERCENT
   
   SUMMARY...A SEVERE THREAT MAY DEVELOP ACROSS CNTRL VA OVER THE NEXT
   1 TO 2 HOURS. WIND DAMAGE AND A TORNADO COULD OCCUR AS A SQUALL-LINE
   MOVES INTO SCNTRL VA. WW ISSUANCE MAY BE NEEDED ACROSS PARTS OF SRN
   VA.
   
   DISCUSSION...A DEVELOPING QLCS IS CURRENTLY ONGOING TO THE EAST OF
   ROANOKE VA LOCATED VERY NEAR TO THE AXIS OF ANALYZED 45 TO 55 KT
   LOW-LEVEL JET. RADAR SHOWS SMALL EMBEDDED LEWP STRUCTURES OVER
   PITTSYLVANIA...BEDFORD AND ROCKINGHAM COUNTIES WITH REPORTS OF
   LOCALIZED WIND DAMAGE DURING THE PAST HOUR. SFC DEWPOINTS
   IMMEDIATELY AHEAD OF THE LINE ARE IN THE LOWER 60S F BUT FURTHER TO
   THE EAST...MID 60S F DEWPOINTS ARE PRESENT. THIS ALONG WITH STRONG
   LOW-LEVEL SHEAR MAY ALLOW THE STRONGER CELLS EMBEDDED IN THE LINE TO
   REACH SEVERE LIMITS. 40 TO 50 KT OF FLOW JUST ABOVE THE SFC MAY
   ENABLE TO THE LINE TO PRODUCE WIND DAMAGE. STRONG SPEED SHEAR IN THE
   BOUNDARY LAYER MAY ALSO BE SUFFICIENT FOR AN ISOLATED TORNADO
   THREAT.
   
   ..BROYLES/HART.. 04/12/2013
   
   
   ATTN...WFO...AKQ...LWX...RAH...RNK...
   
   LAT...LON   38197839 37727913 37097962 36777957 36597932 36527883
               36497819 36577757 37007684 37627676 38067734 38197839