MESOSCALE DISCUSSION 0524
   NWS STORM PREDICTION CENTER NORMAN OK
   0456 PM CDT THU APR 18 2013
   
   AREAS AFFECTED...NRN/CNTRL MS...FAR NERN LA
   
   CONCERNING...TORNADO WATCH 126...
   
   VALID 182156Z - 182330Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 126 CONTINUES.
   
   SUMMARY...RISK FOR DAMAGING WINDS AND TORNADOES SHOULD PERSIST INTO
   MID-EVENING THROUGH THE BULK OF WW 126 AND MAY DEVELOP INTO AREAS N
   OF THE WW IN NRN MS. THIS AREA WILL CONTINUE TO BE MONITORED FOR AN
   ADDITIONAL TORNADO WATCH.
   
   DISCUSSION...MOST INTENSE PORTION OF THE EXTENSIVE QLCS REMAINS
   CONFINED TO THE FAR SRN EXTENT...CURRENTLY CROSSING THE MS RIVER
   NEAR THE JUXTAPOSITION OF THE AR/LA/MS BORDER. THE LARGEST SURFACE
   PRESSURE FALLS AT 21Z WERE NOTED JUST AHEAD OF THESE SEVERE
   STORMS...ON THE NOSE OF THE MIDDLE/UPPER 60S SURFACE DEW POINTS. 18Z
   JAN RAOB AND A 2030Z RAOB LAUNCHED BY MS STATE AROUND 30 NE GLH BOTH
   INDICATED MODEST SURFACE-BASED BUOYANCY. HOWEVER...DEEP-LAYER SHEAR
   HAS STRENGTHENED PER THE LATTER RAOB AND JAN VWP DATA. THIS WILL
   SUPPORT CONTINUED THREATS OF DAMAGING WINDS AND TORNADOES AS
   EMBEDDED SUPERCELL STRUCTURES MAY PERSIST WITHIN THE
   LINE...PRIMARILY N OF THE I-20 CORRIDOR.
   
   ..GRAMS/THOMPSON.. 04/18/2013
   
   
   ATTN...WFO...MEG...JAN...LZK...
   
   LAT...LON   34159090 34529035 34598964 34548929 34168865 32928908
               32008983 31809073 31989165 32309172 34159090