SWOMCD
SPC MCD 261817
NCZ000-SCZ000-GAZ000-FLZ000-ALZ000-261915-
MESOSCALE DISCUSSION 2164
NWS STORM PREDICTION CENTER NORMAN OK
0117 PM CDT TUE AUG 26 2008
AREAS AFFECTED...ERN FL PANHANDLE/GA/WRN AND CENTRAL SC/SOUTH
CENTRAL NC
CONCERNING...TORNADO WATCH 866...
VALID 261817Z - 261915Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 866 CONTINUES.
LOW LEVEL SHEAR VALUES REMAIN FAVORABLE FOR SUSTAINED STORM ROTATION
WITH AN ATTENDANT THREAT FOR TORNADOES ACROSS MUCH OF WW 866 THIS
AFTERNOON.
17Z SURFACE ANALYSIS INDICATED THE CENTER OF CIRCULATION ATTENDANT
TO THE REMNANTS OF FAY WAS LOCATED ALONG THE AL/TN BORDER...WHILE
THE AXIS OF STRONGEST SLY LOW LEVEL WINDS /30-35 KT/ REMAINED ACROSS
GA INTO THE SRN APPALACHIANS. A SURFACE BOUNDARY EXTENDED GENERALLY
EWD FROM THIS AREA OF LOW PRESSURE THROUGH NRN GA AND NWRN SC TO
SERN NC. STRONG SURFACE HEATING WITHIN THE WARM SECTOR TO THE EAST
OF THE LEADING BAND OF TSTMS WHICH EXTENDED FROM NERN TO SWRN GA IS
SUPPORTING A MODERATELY UNSTABLE AIR MASS. THIS INSTABILITY
COMBINED WITH EFFECTIVE BULK SHEAR UP TO 35 KT WILL RESULT IN
ADDITIONAL ORGANIZED STORMS FROM WRN SC/NERN GA SSWWD ACROSS THE
TORNADO WATCH WHERE LOW LEVEL CONVERGENCE REMAINS MAXIMIZED. VWP
DATA OVER CENTRAL GA INDICATED LOW LEVEL SHEAR /0-1 KM SHEAR 20+ KT
AND 0-3 KM SRH 250 M2/S2/ SUPPORTIVE FOR STORM ROTATION/ATTENDANT
TORNADO THREAT.
BACKED ELY SURFACE WINDS ALONG THE E-W BOUNDARY OVER NRN SC/SERN NC
WILL ALSO MAINTAIN AN ENHANCED TORNADO THREAT WITH ANY STORMS THAT
MOVE ACROSS OR TRACK EWD IN THE VICINITY OF THIS FRONT.
FARTHER W...AREA VWP DATA SHOWED LOW LEVEL WINDS VEERING TO SWLY
FROM NWRN GA TO ALONG THE AL/GA BORDER...RESULTING IN SMALLER
HODOGRAPH CURVATURE. THIS TREND SUGGESTS THAT COUNTIES CAN BE
CANCELLED FROM WW 866 ONCE LOW LEVEL WINDS VEER.
..PETERS.. 08/26/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RAH...ILM...CHS...CAE...GSP...JAX...FFC...TAE...BMX...
29688552 30998533 32398504 33328486 34258391 34818261
35258210 35428086 34737979 34417857 33677853 33557986
33688084 33238147 32498210 31278305 30328322 29828436
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