SWOMCD
SPC MCD 251907
GAZ000-FLZ000-ALZ000-252000-
MESOSCALE DISCUSSION 2155
NWS STORM PREDICTION CENTER NORMAN OK
0207 PM CDT MON AUG 25 2008
AREAS AFFECTED...AL/FL PANHANDLE/WRN GA
CONCERNING...TORNADO WATCH 863...
VALID 251907Z - 252000Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 863 CONTINUES.
ERN PART OF WW 863 /ERN AL AND WRN GA/ MAY BE LOCALLY EXTENDED FOR
1-2 HOURS BEYOND THE SCHEDULED 20Z EXPIRATION TIME. HOWEVER...
OVERALL SEVERE WEATHER THREAT IS EXPECTED TO CONTINUE DIMINISHING
THIS AFTERNOON.
AT 1830Z...REGIONAL RADAR/SATELLITE IMAGERY INDICATED THE CENTER OF
T.D. FAY MOVING SLOWLY NWD ACROSS EAST CENTRAL MS. AREA VWP DATA
INDICATED SOME WEAKENING IN THE LLJ WITH STRONGEST AXIS OF LOW AND
MID LEVEL WINDS HAS SHIFTED EWD INTO ERN AL TO ALONG THE AL/GA
BORDER. BACKED SURFACE WINDS /ESELY/ BENEATH SLY LLJ ARE
MAINTAINING STRONG LOW LEVEL SHEAR /SFC-1 KM SHEAR 30-40 KT/ FROM
CENTRAL/ERN AL INTO WRN GA. EFFECTIVE BULK SHEAR AROUND 35 KT
ACROSS THESE SAME AREAS WOULD BE SUPPORTIVE OF SUSTAINED UPDRAFTS.
HOWEVER...THE EXTENSIVE AREA OF SHOWERS/EMBEDDED TSTMS ALONG ERN
PERIPHERY OF T.D. FAY HAS OVERTURNED MUCH OF THE AVAILABLE
CONVECTIVE INSTABILITY. ALTHOUGH THE SHEAR VALUES WOULD SUPPORT
STORM ROTATION...THE WEAK INSTABILITY SHOULD LIMIT THE AREAL
COVERAGE OF ADDITIONAL SEVERE STORMS.
..PETERS.. 08/25/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FFC...TAE...BMX...HUN...MOB...
30008717 31268768 31488738 32228697 33228726 33978764
33998693 34238610 34558539 34388430 33188395 31988402
31668452 30488449 29768464 29218521 29928629
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