SPC MESOSCALE DISCUSSION 0172 FOR SERN MS/SWRN AL
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL...
   
   VALID 122154Z - 130000Z
   
   A THREAT FOR ISOLATED SEVERE HAIL WILL CONTINUE WITH THE
   THUNDERSTORMS OVER SERN MS INTO SWRN AL FOR THE NEXT 2-3 HOURS.  
   WW IS NOT EXPECTED.
   
   A CLUSTER OF STRONG TO SEVERE STORMS HAS DEVELOPED FROM WASHINGTON
   PARISH LA TO COVINGTON COUNTY MS DURING THE LAST HALF HOUR.  THESE
   STORMS FORMED ALONG A COLD FRONT AND WITHIN A MARGINALLY UNSTABLE
   AIRMASS WITH SBCAPE VALUES AROUND 1500 J/KG.  IN ADDITION...LOW-MID
   LEVEL LAPSE RATES HAVE INCREASED DUE TO THIS AREA BEING THE
   VICINITY OF COLD MID-LEVEL TEMPERATURES AROUND -20 C.  STORMS
   SHOULD CONTINUE TO DEVELOP ALONG LOW-LEVEL CONVERGENCE ASSOCIATED
   WITH THE SEWD MOVING COLD FRONT.  HOWEVER...THE THREAT SHOULD BE
   LIMITED TO A FEW HOURS...WITH ACTIVITY DIMINISHING AFTER SUNSET.
   
   ..PETERS.. 03/12/02