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
   
   
   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