MESOSCALE DISCUSSION 0533
   NWS STORM PREDICTION CENTER NORMAN OK
   1021 PM CDT SUN APR 19 2009
   
   AREAS AFFECTED...CNTRL AL THROUGH NRN AND CNTRL GA
   
   CONCERNING...TORNADO WATCH 175...176...
   
   VALID 200321Z - 200445Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 175...176...CONTINUES.
   
   THREAT FOR MAINLY ISOLATED TORNADOES AND DAMAGING WIND WILL LIKELY
   PERSIST INTO THE EARLY MORNING HOURS FROM CNTRL AL THROUGH NRN AND
   CNTRL GA.
   
   THUNDERSTORMS INCLUDING A FEW SUPERCELLS CONTINUE DEVELOPING WITHIN
   ZONE OF ASCENT AND LOW LEVEL WARM ADVECTION ASSOCIATED WITH COUPLED
   JET STRUCTURE ATTENDING SHORTWAVE TROUGH MOVING EWD THROUGH THE TN
   VALLEY AND SERN STATES. THE PRIMARY MOIST AXIS REMAINS ACROSS CNTRL
   AL...BUT OBSERVATIONAL TRENDS INDICATE DEWPOINTS HAVE RISEN 2-3F
   ACROSS N-CNTRL GA. THE NWD ADVECTION OF HIGHER DEWPOINTS APPEARS TO
   BE OFFSETTING THE STABILIZING EFFECTS OF NOCTURNAL COOLING. STORMS
   HAVE INTENSIFIED ACROSS N-CNTRL GA WHERE OCCASIONAL STRONG
   ROTATIONAL SIGNATURES HAVE BEEN OBSERVED. THE ENVIRONMENT REMAINS
   FAVORABLY SHEARED WITH ATLANTA VWP INDICATING 0-1 KM STORM RELATIVE
   HELICITY OF 400-500 M2/S2 ALONG THE LOW LEVEL JET AXIS WHICH WILL
   MAINTAIN A THREAT OF LOW-LEVEL MESOCYCLONES NEXT FEW HOURS.
   
   ..DIAL.. 04/20/2009
   
   
   ATTN...WFO...FFC...BMX...HUN...MOB...
   
   LAT...LON   34188335 32758411 31898568 31948707 32688713 33878608
               34788527 34728393 34188335