MESOSCALE DISCUSSION 0636
   NWS STORM PREDICTION CENTER NORMAN OK
   0553 PM CDT WED APR 29 2009
   
   AREAS AFFECTED...N CNTRL/NERN TX INTO SWRN AR/NWRN LA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 212...
   
   VALID 292253Z - 300000Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 212
   CONTINUES.
   
   PRIMARY THREATS OF DMGG WINDS AND HEAVY RAINFALL WILL CONTINUE
   ACROSS WW212. AREAS IMMEDIATELY DOWNSTREAM ARE BEING MONITORED...AND
   ADDITIONAL COUNTIES MAY NEED TO BE ADDED TO THE WATCH. 
   
   LONG LIVED MCS IS SLOWLY PROPAGATING TO THE S AND E TOWARDS MODERATE
   INSTABILITY. ATTM...PRIMARY SEVERE THREAT APPEARS LIKELY ACROSS ERN
   PORTIONS OF THE WW...WHERE MORE LINEAR ORGANIZATION IS NOTED. BRIEF
   DEVELOPMENT OF ADDITIONAL STORMS ALONG THE OUTFLOW...NOW SLIGHTLY
   AHEAD OF THE MAIN CONVECTIVE LINE...HAS BEEN OBSERVED. STORMS THAT
   CAN DEVELOP ALONG AND AHEAD OF THE OUTFLOW BEFORE BEING ABSORBED
   INTO THE MAIN CONVECTION MAY HAVE BRIEF ROTATION...AND PRODUCE DMGG
   WINDS AHEAD OF THE LINE. COUNTIES ALONG THE EXTREME NRN PORTION OF
   THE WW IN A RAIN COOLED AIRMASS WILL LIKELY BE CLEARED
   SHORTLY...WHILE COUNTIES IMMEDIATELY DOWNSTREAM OF THE MCS WILL BE
   MONITORED FOR A POSSIBLE AREAL EXTENTION.
   
   ..HURLBUT.. 04/29/2009
   
   
   ATTN...WFO...LZK...SHV...FWD...OUN...
   
   LAT...LON   32809350 32379481 32589626 33129792 33589835 33939768
               33729617 33449474 34469354 34199292 33109315 32809350