MESOSCALE DISCUSSION 0310
   NWS STORM PREDICTION CENTER NORMAN OK
   0147 AM CDT SAT MAR 28 2009
   
   AREAS AFFECTED...SERN LA/CENTRAL AND SRN MS
   
   CONCERNING...TORNADO WATCH 83...
   
   VALID 280647Z - 280700Z
   
   CORRECTED FOR WATCH NUMBER TYPO IN TEXT OF MCD
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 83 CONTINUES.
   
   WW 83 WILL NEED TO BE EITHER EXTENDED IN TIME BEYOND THE SCHEDULED
   07Z EXPIRATION OR A NEW WW WILL BE ISSUED TO REPLACE WW 83.
   
   TRENDS IN REGIONAL RADARS ACROSS THE LOWER MS VALLEY INDICATED
   ACTIVITY FROM SERN LA INTO PARTS OF CENTRAL MS ARE EVOLVING INTO A
   MORE LINEAR TYPE SYSTEM.  THIS SCENARIO IS EXPECTED AS MID-UPPER
   LEVEL FLOW/EFFECTIVE SHEAR VECTORS BACK ACROSS THIS REGION WITH THE
   APPROACH OF THE SRN PLAINS CLOSED LOW.  A CONTINUED INFLUX OF GULF
   MOISTURE NWD ALONG SLY LLJ WITHIN WARM SECTOR WILL MAINTAIN AN
   UNSTABLE ENVIRONMENT CONDUCIVE FOR ADDITIONAL TSTMS.  LOW LEVEL
   SHEAR IS EXPECTED TO REMAIN STRONG...GIVEN BACKED SELY SURFACE WINDS
   BENEATH SLY LLJ.
   
   ..PETERS.. 03/28/2009
   
   
   ATTN...WFO...BMX...MOB...JAN...LIX...LCH...
   
   LAT...LON   29279211 31629064 33028977 32918824 30018975 29259003
               28919052 29279211