MESOSCALE DISCUSSION 0499
   NWS STORM PREDICTION CENTER NORMAN OK
   1022 PM CDT WED APR 20 2011
   
   AREAS AFFECTED...SERN AR...N CNTRL MS AND AL
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 173...
   
   VALID 210322Z - 210445Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 173
   CONTINUES.
   
   AN ORGANIZED BOW IS CURRENTLY MOVING ACROSS WALKER AND WINSTON
   COUNTY AL IS EXPECTED TO PERSIST FOR A COUPLE MORE HOURS...AFFECTING
   JEFFERSON...BLOUNT...CULLMAN COUNTY AREA INCLUDING THE BIRMINGHAM
   AREA. SURFACE ANALYSIS SHOWED A WEAK MESOLOW ASSOCIATED WITH THIS
   DEVELOPING LINE...AND LATEST RADAR TRENDS INDICATE THE NRN END OF
   THE LINE IS LIKELY SEVERE WITH MESOSCALE ROTATION WITH THE LOW. 
   
   WHILE THIS SYSTEM IS CURRENTLY MATURE...WEAKENING LOW TO MID LEVEL
   WINDS...AS WELL AS SLOW STABILIZATION...IS EXPECTED TO CAUSE
   WEAKENING IN THIS SYSTEM LATER THIS EVENING ACROSS ERN PORTIONS OF
   NRN AL. UNTIL THEN...AREAS OF STRONG TO DAMAGING WINDS ARE
   LIKELY...ALONG WITH SOME HAIL.
   
   ..JEWELL.. 04/21/2011
   
   
   ATTN...WFO...BMX...HUN...MEG...JAN...LZK...
   
   LAT...LON   34169168 33708918 33588833 33908771 34348760 34478709
               34378657 33988620 33518623 33088653 32618703 32578809
               32719097 32789151 32999196 33289219 33659224 33839224
               34169168