MESOSCALE DISCUSSION 0854
   NWS STORM PREDICTION CENTER NORMAN OK
   0109 PM CDT SUN MAY 22 2011
   
   AREAS AFFECTED...CNTRL/ERN AR...NRN MS...SWRN TN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 321...
   
   VALID 221809Z - 221915Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 321
   CONTINUES.
   
   WW 321 IS SCHEDULED TO EXPIRE AT 19Z AND THE NEED FOR A WW
   REPLACEMENT REMAINS UNCLEAR. LOW-LEVEL WARM THETA-E ADVECTION WILL
   CONTINUE ATOP A WEST/EAST-ORIENTED OUTFLOW BOUNDARY STRETCHING FROM
   30 N TXK TO 25 S TUP AT 18Z. THIS WILL FAVOR TSTM REGENERATION
   ACROSS THE MS VALLEY THROUGH AT LEAST MID-AFTERNOON. GIVEN EFFECTIVE
   SHEAR OF 30 TO 4O KT...A THREAT FOR MARGINALLY SEVERE HAIL AND
   LOCALIZED MICROBURSTS SHOULD PERSIST WITHIN STRONGER CORES.
   
   ..GRAMS.. 05/22/2011
   
   
   ATTN...WFO...HUN...MEG...JAN...LZK...
   
   LAT...LON   34369300 34759292 35069152 35658958 35638852 35338805
               34878812 34528846 34248990 34089123 34179257 34369300