MESOSCALE DISCUSSION 0570
   NWS STORM PREDICTION CENTER NORMAN OK
   0115 PM CDT MON APR 25 2011
   
   AREAS AFFECTED...ERN AR...SWRN TN...NRN MS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 200...
   
   VALID 251815Z - 251915Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 200
   CONTINUES.
   
   SURFACE AIRMASS AHEAD OF FORWARD PROPAGATING MCS POSITIONED NEAR THE
   MS RIVER AT 1755Z CONTINUES TO WARM...PARTICULARLY OVER NRN MS WHERE
   TEMPERATURES HAVE RISEN TO AROUND 80 F. THIS HEATING COMBINED WITH
   DEWPOINTS IN THE MID TO UPPER 60S IS AIDING IN THE DEVELOPMENT OF
   MLCAPE VALUES AROUND 1000 J/KG ALONG AND S OF THE CURRENT MCS TRACK.
   THIS SHOULD CONTINUE TO SUPPORT SYSTEM MAINTENANCE AND
   INTENSIFICATION...EVIDENT BY COOLING IR CLOUD TOPS AND INCREASING
   RADAR REFLECTIVITY. AS THE MCS MOVES DOWNSTREAM AT 30-40 KT...A
   DAMAGING WIND THREAT IS EXPECTED TO CONTINUE WITH BOWING SEGMENTS.
   IN ADDITION...30+ KT LLJ IS CONTRIBUTING TOWARD LOW-LEVEL VERTICAL
   WIND SHEAR SUFFICIENT FOR MESOVORTICES/ISOLATED TORNADO DEVELOPMENT
   EMBEDDED WITHIN THE LEADING EDGE OF THE QLCS.
   
   IF THE MCS MAINTAINS INTENSITY AS IT NEARS THE ERN EDGE OF WW
   200...AN ADDITIONAL DOWNSTREAM WATCH MAY BECOME NECESSARY.
   
   ..GARNER.. 04/25/2011
   
   
   ATTN...WFO...MEG...JAN...LZK...
   
   LAT...LON   35339120 35408826 33948827 33889120 35339120