MESOSCALE DISCUSSION 0855
   NWS STORM PREDICTION CENTER NORMAN OK
   1127 AM CDT FRI MAY 22 2009
   
   AREAS AFFECTED...SRN/CNTRL FL
   
   CONCERNING...HEAVY RAINFALL 
   
   VALID 221627Z - 221830Z
   
   RAINBAND ATTENDANT TO THE GULF OF MEXICO LOW WILL SHIFT SLOWLY NWD
   THROUGH EARLY AFTN ACROSS SRN/CNTRL FL.  HEAVIEST AXIS OF RNFL WILL
   LIKELY EVOLVE FROM THE MIAMI-DADE REGION NWD THROUGH ERN BROWARD
   COUNTY...AND FROM LAKE OKEECHOBEE NWWD INTO POLK COUNTY.  HOURLY
   RATES COULD EASILY EXCEED 1-3 INCHES. 
   
   VORTICITY SPOKE ROTATING AROUND DEEP LAYER CYCLONE CENTERED 260
   MILES W OF KTPA WILL MOVE NWD THROUGH CNTRL FL THIS AFTN.  MODEST
   LLVL CONVERGENCE BENEATH THIS BAND AND WITHIN WEAKLY CAPPED AND VERY
   MOIST AIR MASS /MLCAPES 1500-2000 J PER KG AND PWATS 1.5-1.8 INCHES/
   HAVE CONTRIBUTED TO NUMEROUS TSTMS.  PRIMARY BAND OF STORMS WILL
   TRANSLATE NWD AT 10-15 KTS WITH LEADING CONVECTION MERGING AND
   BOOSTING RNFL RATES.  SRN PORTIONS OF THE LINE WILL BE ORIENTED SUCH
   THAT TRAINING RAINFALL WILL BE AN ISSUE ACROSS THE URBAN CORRIDOR
   ALONG THE SERN CST.  IN ADDITION TO THE HVY RNFL THREAT...GUSTY
   WINDS TO 30-40 KTS WILL BE LIKELY AS STRONGER CORES COLLAPSE.
   
   ..RACY.. 05/22/2009
   
   
   ATTN...WFO...MFL...MLB...TBW...
   
   LAT...LON   25668013 25598042 26748096 27228137 27848213 28418213
               28528159 28288106 27798067 27148029 25668013