MESOSCALE DISCUSSION 0464
   NWS STORM PREDICTION CENTER NORMAN OK
   0727 AM CDT MON APR 13 2009
   
   AREAS AFFECTED...SOUTHERN AL/SOUTHERN GA/NORTH FL
   
   CONCERNING...TORNADO WATCH 148...
   
   VALID 131227Z - 131430Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 148 CONTINUES.
   
   TORNADO WATCH 148 CONTINUES UNTIL 15Z...WITH A CONTINUED RISK FOR
   ISOLATED TORNADOES/DAMAGING WINDS AND HAIL. WILL MONITOR FOR THE
   POSSIBILITY OF AN ADDITIONAL WATCH /MAINLY ACROSS SOUTH GA AND NORTH
   FL/ PRIOR TO THE SCHEDULED 15Z EXPIRATION OF WW 148.
   
   LEADING PORTION OF NORTHEAST-SOUTHWEST ORIENTED QUASI-LINEAR
   CONVECTIVE SYSTEM/COMPOSITE OUTFLOW WILL CONTINUE TO DEVELOP
   EASTWARD ACROSS THE FL PANHANDLE/FAR SOUTHEAST AL INTO SOUTHERN GA
   OVER THE NEXT SEVERAL HOURS. GIVEN A RESIDUAL WARM LAYER ALOFT /PER
   12Z TLH OBSERVED RAOB/ AND LIMITED EARLY DAY HEATING ACROSS THE
   PRE-QLCS WARM SECTOR...PRIMARY SEVERE THREAT SHOULD REMAIN CLOSELY
   TIED TO LINE-ASSOCIATED SMALL SCALE BOWS/EMBEDDED SUPERCELLS INTO
   MID MORNING. A MODESTLY MOIST BOUNDARY LAYER AND RATHER FAVORABLE
   SHEAR PROFILES...WITH 300-500 M2/S2 0-1 KM SRH PER THE 12Z TLH
   RAOB/REGIONAL WSR-88D VWPS...WILL SUPPORT A CONTINUED RISK OF
   ISOLATED TORNADOES/DAMAGING WINDS THIS MORNING. IN ADDITION...VERY
   HEAVY RAINFALL WILL CONTINUE TO BE A THREAT AS THE BROAD CONVECTIVE
   LINE REMAINS ORIENTED WITH THE MEAN FLOW. AS DIURNAL WARMING/LOW
   LEVEL MOISTENING OCCURS...EARLY INDICATIONS ARE THAT AN ADDITIONAL
   WATCH WILL BE NEEDED ACROSS PORTIONS OF SOUTH GA/NORTH FL PRIOR TO
   THE SCHEDULED 15Z EXPIRATION OF WW 148.
   
   ..GUYER.. 04/13/2009
   
   
   ATTN...WFO...JAX...FFC...TAE...BMX...MOB...LIX...
   
   LAT...LON   30278870 30808849 31188723 31358629 31848522 32218460
               31008281 30158508 30278870