MESOSCALE DISCUSSION 0738
   NWS STORM PREDICTION CENTER NORMAN OK
   0251 PM CDT WED MAY 11 2011
   
   AREAS AFFECTED...CNTRL THROUGH NERN TX
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 278...
   
   VALID 111951Z - 112115Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 278
   CONTINUES.
   
   THREAT FOR ISOLATED DAMAGING WIND AND LARGE HAIL WILL PERSIST. THE
   DAMAGING WIND THREAT APPEARS GREATEST ACROSS NERN TX WITH ISOLATED
   LARGE HAIL AND HEAVY RAIN MORE PROBABLE ACROSS S-CNTRL THROUGH CNTRL
   TX. A NEW WW MIGHT BE NEEDED FARTHER EAST ACROSS NERN TX...SWRN AR
   INTO EXTREME NWRN LA...OR WW 278 MAY NEED TO BE REPLACED.
   
   A SQUALL LINE CONTINUES FROM NERN TX SWWD THROUGH S-CNTRL TX. NRN
   PORTION OF THE LINE HAS EVOLVED INTO A BOW ECHO AND IS MOVING EWD
   MORE QUICKLY AT 45 KT...WHILE TRAILING SRN END HAS A MUCH SMALLER
   EWD COMPONENT OF MOTION WITH A GREATER THREAT OF PERSISTENT HEAVY
   RAIN AS WELL AS LARGE HAIL. THE ATMOSPHERE DOWNSTREAM OF THE LINE
   REMAINS MODERATELY UNSTABLE...AND ACTIVITY WILL LIKELY CONTINUE EWD
   THE NEXT FEW HOURS. FORT WORTH VWP INDICATES BOWING PORTION HAS A
   45-50 KT REAR INFLOW JET WHICH IS SUPPORTING STRONG CONVERGENCE NEAR
   THE APEX. THREAT FOR DAMAGING WIND WILL LIKELY CONTINUE AS THIS
   ACTIVITY ADVANCES THROUGH REMAINDER OF NERN TX. STORMS WILL APPROACH
   THE ERN EDGE OF WW 278 BY 21Z...BUT SOME UNCERTAINTY EXISTS
   REGARDING ERN EXTENT OF SEVERE THREAT AS ACTIVITY BEGINS TO SHIFT
   EAST OF LLJ AXIS.
   
   ..DIAL.. 05/11/2011
   
   
   ATTN...WFO...LZK...SHV...TSA...FWD...EWX...SJT...
   
   LAT...LON   32469763 33659633 34279428 33259353 32409477 30589877
               31039948 32469763