SWOMCD
SPC MCD 201906
ALZ000-MSZ000-LAZ000-202030-
MESOSCALE DISCUSSION 2248
NWS STORM PREDICTION CENTER NORMAN OK
0106 PM CST THU DEC 20 2007
AREAS AFFECTED...SERN LA...FAR SRN MS
CONCERNING...TORNADO WATCH 741...
VALID 201906Z - 202030Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 741 CONTINUES.
A SEVERE THREAT WILL CONTINUE ACROSS WW 741 WITH THE GREATEST
POTENTIAL FOR SEVERE ACROSS THE SRN AND ERN PART OF THE WATCH. WIND
DAMAGE AND HAIL WILL BE POSSIBLE WITH THE STRONGER STORMS.
THE LATEST SFC ANALYSIS SHOWS A COLD FRONT ADVANCING EWD ACROSS FAR
SE TX AND WRN LA WITH SFC DEWPOINTS REMAINING IN THE 60S F ACROSS
SRN LA AND FAR SRN MS. SFC WINDS HAVE VEERED ACROSS SOUTHWEST LA AND
A DRY SLOT ASSOCIATED WITH AN APPROACHING UPPER-LEVEL TROUGH HAS
ENDED THE SEVERE THREAT THERE. FARTHER EAST ACROSS SE LA...SFC WINDS
REMAIN SLY AND OBJECTIVE ANALYSIS SUGGESTS MUCAPE VALUES OF 500 TO
1000 J/KG STILL EXIST IN THE NEW ORLEANS AREA. IN ADDITION...STRONG
VERTICAL SHEAR IS PRESENT EVIDENT ON SEVERAL REGIONAL WSR-88D VWPS
WHICH COMBINED WITH STEEPENING MID-LEVEL LAPSE RATES AS THE
UPPER-LEVEL TROUGH APPROACHES SHOULD CONTINUE TO PROMOTE AN ISOLATED
SEVERE THREAT THIS AFTERNOON.
.BROYLES.. 12/20/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MOB...JAN...LIX...LCH...
29489331 29819326 29599263 30099255 30069240 30269217
30399204 30409188 30449166 30699171 30799182 30939180
30999167 31009157 31079154 31119160 31249160 31229148
31309146 31369133 31369130 31339106 31359006 31219003
31168996 31108988 31068981 31008982 31028953 30998943
31018938 31008932 30668934 30648922 30688917 30668889
30758883 30718842 30348839 29928830 29898844 29618855
29428872 29238868 28978874 28858884 28708903 28638924
28628945 28698967 28958978 28818999 28749022 28739054
28719070 28719085 28789113 28869120 28949140 29079156
29179160 29099180 29119195 29219208 29229234 29259259
29319280 29399301 29449318
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