MESO: Mesoscale Discussion 0421

ACUS11 KWNS 151821
SWOMCD
SPC MCD 151821
NCZ000-SCZ000-GAZ000-ALZ000-151945-

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

..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MHX...RAH...ILM...CHS...CAE...GSP...FFC...BMX...

33547902 32768366 32818558 33498629 34008580 35128226
35527772 35137690 34667697 34327770 33867798 33887840
33767879

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