MESOSCALE DISCUSSION 1410
   NWS STORM PREDICTION CENTER NORMAN OK
   0517 PM CDT SAT JUL 07 2007
   
   AREAS AFFECTED...ERN AL
   
   CONCERNING...TORNADO WATCH 490...
   
   VALID 072217Z - 072345Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 490 CONTINUES.
   
   A CLUSTER OF ROTATING STORMS ACROSS THE WRN AND SRN PART OF WW 490
   SHOULD CONTINUE TO HAVE A TORNADO THREAT OVER THE NEXT FEW HOURS.
   THE THREAT SHOULD EXPAND EWD AFFECTING AREAS NEAR THE GEORGIA
   STATE-LINE BY EARLY EVENING.
   
   LATEST SFC ANALYSIS SHOWS A SFC LOW EAST OF JACKSON MS WITH A
   STATIONARY BOUNDARY EXTENDING EWD ACROSS SCNTRL AL JUST SOUTH OF THE
   MONTGOMERY AL VICINITY. A CLUSTER OF STORMS IS ONGOING ALONG THE
   BOUNDARY ALONG THE NRN GRADIENT OF A POCKET OF MODERATE INSTABILITY
   IN SRN AL WHERE MLCAPE VALUES RANGE FROM 1000 TO 1500 J/KG. THE
   BIRMINGHAM WSR-88D VWP CURRENTLY SHOWS A LARGE CIRCULAR HODOGRAPH
   WITH STRONG DIRECTIONAL SHEAR BELOW 1 KM AND ABOUT 35 KT OF VERTICAL
   SHEAR. THIS SHOULD BE SUFFICIENT FOR A FEW SUPERCELLS AND/OR BOW
   ECHOES WITH TORNADO POTENTIAL OVER THE NEXT FEW HOURS. THE THREAT
   SHOULD GRADUALLY SHIFT DOWNSTREAM TO AREAS EAST OF HIGHWAY 231 IN
   THE 23Z TO 01Z TIMEFRAME.
   
   ..BROYLES.. 07/07/2007
   
   
   ATTN...WFO...FFC...TAE...BMX...MOB...
   
   31388601 31428559 31548506 31998483 32558485 32908503
   32958532 32978617 32918687 32628705 32018708 31628686
   31448638