SWOMCD
SPC MCD 220133
ALZ000-TNZ000-KYZ000-MSZ000-LAZ000-ARZ000-TXZ000-220300-
MESOSCALE DISCUSSION 2157
NWS STORM PREDICTION CENTER NORMAN OK
0733 PM CST WED NOV 21 2007
AREAS AFFECTED...WRN TN/NRN AND WRN MS/SERN AR/PARTS OF ERN AND SRN
LA
CONCERNING...SEVERE THUNDERSTORM WATCH 735...736...
VALID 220133Z - 220300Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
735...736...CONTINUES.
MOIST/UNSTABLE PRE-FRONTAL AIR MASS ACROSS THE LOWER MS VALLEY AND
EFFECTIVE BULK SHEAR OF 30-40 KT ARE EXPECTED TO MAINTAIN TSTM
DEVELOPMENT ALONG THE PROGRESSIVE COLD FRONT FOR THE NEXT SEVERAL
HOURS.
TSTM DEVELOPMENT ALONG THE COLD FRONT IN SWRN LA HAS DECREASED IN
INTENSITY AS THIS ACTIVITY MOVES INTO A CONVECTIVELY OVERTURNED
ENVIRONMENT IN THE WAKE OF PRE-FRONTAL TSTM CLUSTER NOW MOVING
THROUGH SWRN LA TO FAR SWRN MS. THIS LEADING TSTM CLUSTER MAY HAVE
AN ENHANCED WIND THREAT GIVEN UNSATURATED MID LEVEL ENVIRONMENT PER
00Z SOUNDINGS AT LCH/JAN AND SOME COLD POOL DEVELOPMENT ACROSS
SWRN/CENTRAL LA.
FARTHER N...EARLY EVENING OBJECTIVE ANALYSES INDICATED DECREASING
INSTABILITY ACROSS NRN PART OF WW 736 IN WRN TN/NRN MS...GIVEN LOSS
OF DAY TIME HEATING. THIS SHOULD RESULT IN A DIMINISHING SEVERE
WEATHER THREAT AS ACTIVITY MOVES EWD.
.PETERS.. 11/22/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OHX...BMX...HUN...PAH...MEG...JAN...LIX...LZK...LCH...SHV...HGX...
30119500 30769360 31439246 32519228 34109078 34908981
36538832 36478797 35068793 33738825 32888888 31428994
30249025 29879127
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