SWOMCD
SPC MCD 201903
ALZ000-FLZ000-MSZ000-202000-
MESOSCALE DISCUSSION 2247
NWS STORM PREDICTION CENTER NORMAN OK
0103 PM CST THU DEC 20 2007
AREAS AFFECTED...SRN AL AND EXTREME WRN FL PANHANDLE
CONCERNING...TORNADO WATCH 742...743...
VALID 201903Z - 202000Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 742...743...CONTINUES.
GREATEST SEVERE THREAT...THE NEXT HOUR OR SO...WILL BE ACROSS SWRN
AL AND THE FAR WRN FL PANHANDLE.
AT 1850Z...AN MCV/POSSIBLE MESOLOW WAS LOCATED ABOUT 70 ESE OF MEI.
THIS CIRCULATION AND ASSOCIATED REAR INFLOW JET HAVE WEAKENED AS THE
SYSTEM HAS MOVED INTO WEAKER INSTABILITY. HOWEVER...CONVECTION
CONTINUES FROM THE MESOLOW SWWD INTO EXTREME SWRN AL AND FAR SERN
MS. A BOUNDARY ALSO EXTENDED FROM THE NORTH CENTRAL GULF NWD INTO
FAR SWRN AL. AT THE INTERSECTION OF THE THUNDERSTORM LINE AND
BOUNDARY...AND GIVEN THE STRONG DEEP LAYER SHEAR...THE POTENTIAL
EXISTS FOR ANOTHER WEAK CIRCULATION TO DEVELOP ALONG THIS LINE.
SPORADIC WIND DAMAGE IS EXPECTED WITH THE LINE AS IT SHIFTS
ESEWD...BUT THE THREAT FOR WIND DAMAGE WOULD INCREASE IF ANOTHER MID
LEVEL CIRCULATION DEVELOPS ALONG THE BOUNDARY.
.IMY.. 12/20/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MOB...LIX...
30228794 30288855 30548872 30818823 31228769 31608748
31738715 31578686 30958705 30398763
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