MESOSCALE DISCUSSION 0159
   NWS STORM PREDICTION CENTER NORMAN OK
   0145 AM CST FRI FEB 27 2009
   
   AREAS AFFECTED...ERN AR...FAR WRN TN...EXTREME NWRN MS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 33...35...
   
   VALID 270745Z - 270815Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   33...35...CONTINUES.
   
   SVR TSTM WATCH 33 IS SET TO EXPIRE AT 08Z.
   
   PRIMARY FORCING FOR LARGE SCALE ASCENT WAS BEGINNING TO FOCUS NORTH
   OF THE MEMPHIS AREA NEWD INTO THE OH VLY EARLY THIS MORNING.  VWP
   PLOTS SUGGEST A QUICKLY VEERING LLVL WIND FIELD OVER AR...WITH
   STRONGEST LLJ BECOMING CONCENTRATED FROM NWRN TN INTO SWRN OH. AS
   SUCH...HIGHEST POTENTIAL FOR DMGG WIND GUSTS/HAIL THROUGH THE NEXT
   FEW HOURS SHOULD BE ACROSS FAR NERN AR...NWRN TN AND POINTS NEWD
   FROM THERE.
   
   FARTHER S...GENERATION ZONE FOR NEW CONVECTIVE TOWERS HAS GRADUALLY
   BEEN SHIFTING OUT OF SWRN AR INTO SERN AR/NWRN MS WHERE WEAKER SWLY
   LLJ COMPONENT IMPINGES UPON CONVECTIVELY COOLED ENVIRONMENT. 
   EARLIER SEMI-ORGANIZED CELL STRUCTURES HAVE BECOME ILL-DEFINED AS
   OVERALL SHEAR IN THE LOWEST 3 KM WEAKENS WITH VEERING/WEAKENING WIND
   PROFILES.  AS A RESULT...ONLY ISOLD HAIL/GUST WIND POTENTIAL SHOULD
   EXIST ACROSS SRN SECTIONS OF WW 35 AND THE REMAINING PORTIONS OF
   EXPIRING WW 33.
   
   ..RACY.. 02/27/2009
   
   
   ATTN...WFO...MEG...LZK...
   
   LAT...LON   34249344 36319039 36008952 34799017 33599170 34249344