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Mesoscale Discussion #0421 issued at 1821 UTC 15 March 2008
MESOSCALE DISCUSSION 0421
   NWS STORM PREDICTION CENTER NORMAN OK
   0121 PM CDT SAT MAR 15 2008
   
   AREAS AFFECTED...PORTIONS ERN AL...NRN GA...SC...SRN NC.
   
   CONCERNING...TORNADO WATCH 119...
   
   VALID 151821Z - 151945Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 119 CONTINUES.
   
   TORNADIC SUPERCELL HAS PASSED OVER HALL COUNTY GA...MOVING ROUGHLY
   FROM 260 DEG AT 50 KT...SLIGHTLY MORE RIGHTWARD THEN EARLIER AND
   INTO INCREASINGLY MOIST/UNSTABLE WARM-FRONTAL AIR.  ASSOCIATED
   POTENTIAL FOR SIGNIFICANT TORNADOES...DAMAGING WIND AND HAIL MAY
   EXTEND TO ANDERSON COUNTY SC AROUND 19Z...UNION/FAIRFIELD/NEWBERRY
   COUNTY AREA AROUND 20Z.  WITH DESTABILIZATION OF AIR MASS CONTINUING
   INVOF WARM FRONT E OF THIS STORM...AND LIKELIHOOD OF
   ADDITIONAL/UPSTREAM ACTIVITY MOVING ACROSS THIS REGION...ANOTHER WW
   MAY BE REQUIRED ACROSS PORTIONS SRN NC AND ERN SC.
   
   VERY INTENSE SFC PRESSURE PERTURBATION WITH MAJOR SUPERCELL
   INDICATES INCREASINGLY WELL-DEVELOPED/COLLOCATED MESOLOW.  GVL SFC
   OB SHOWED 4 MB PRESSURE FALL IN 22 MIN AND 6 MB IN ONE HOUR...PRIOR
   TO 40 KT SFC GUST WITH STORM OUTFLOW...THEN 5 MB RISE IN NEXT 7 MIN
   THEREAFTER.  THIS LOW SHOULD PROCEED EWD ALONG WARM FRONT ACROSS NRN
   SC THROUGH NEXT 2-3 HOURS...THEN EWD OVER ADJOINING PORTIONS SRN NC.
    ASSOCIATED ISALLOBARIC FORCING WILL MAINTAIN FAVORABLY BACKED WINDS
   AND ENLARGED LOW LEVEL HODOGRAPHS ALONG WARM FRONT...WITH MODIFIED
   18Z RAOBS AND RUC SOUNDINGS SHOWING MLCAPES AROUND 1000 J/KG IN
   PROSPECTIVE INFLOW LAYER.  THIS MAY SUPPORT ADDITIONAL SUPERCELL
   FORMATION FROM ACTIVITY DEVELOPING AHEAD OF INITIAL/PRIMARY STORM AS
   WELL.
   MEANWHILE SUPERCELL/TORNADO THREAT WILL CONTINUE INVOF BOUNDARY
   ACROSS NRN GA AND PERHAPS NERN AL...WITH ADDITIONAL DEVELOPMENT
   EVIDENT IN THOSE AREAS.
   
   ..EDWARDS.. 03/15/2008
   
   
   ATTN...WFO...MHX...RAH...ILM...CHS...CAE...GSP...FFC...BMX...


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