MESOSCALE DISCUSSION 0477
   NWS STORM PREDICTION CENTER NORMAN OK
   0747 AM CDT TUE APR 14 2009
   
   AREAS AFFECTED...NORTH CENTRAL FL PENINSULA
   
   CONCERNING...TORNADO WATCH 154...
   
   VALID 141247Z - 141415Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 154 CONTINUES.
   
   TORNADO WATCH 154 CONTINUES UNTIL 18Z ACROSS THE NORTH CENTRAL FL
   PENINSULA...WITH A DISTINCT RISK FOR DAMAGING WINDS/ISOLATED
   TORNADOES...AS WELL AS HAIL.
   
   IMPRESSIVE MCS WITH EMBEDDED BOWING STRUCTURES/TRANSIENT BOOKEND
   VORTICES CONTINUES TO QUICKLY MOVE ONTO THE FL WEST COAST...FROM
   AROUND OCALA TO NEAR THE CLEARWATER/TAMPA VICINITY AS OF 1245Z. AS A
   MOIST LOW LEVEL INFLUX CONTINUES FROM THE EASTERN GULF...12Z TAMPA
   BAY OBSERVED RAOB/WSR-88D VWP REFLECTS A RATHER FAVORABLE WIND
   PROFILE WITH AMPLE LOW LEVEL TURNING AND 200+ MS/S2 0-1 KM
   SRH...WHICH IS CONDUCIVE FOR SUSTAINED BOWING STRUCTURES AND
   EMBEDDED AND/OR LINE LEADING QUASI-DISCRETE SUPERCELLS. THE 12Z
   TAMPA BAY RAOB REFLECTS 1600 J/KG OF MLCAPE AND AMPLE DRY AIR/STEEP
   LAPSE RATES ALOFT...AND EVEN MODEST EARLY DAY DIURNAL HEATING
   THROUGH THE LOW/MID 70S F WILL QUICKLY ERODE ANY REMAINING PRE-BOW
   NEAR-SURFACE CINH ACROSS THE REMAINDER OF THE NORTH CENTRAL FL
   PENINSULA.
   
   ..GUYER.. 04/14/2009
   
   
   ATTN...WFO...MLB...TBW...JAX...
   
   LAT...LON   29218275 29598199 29738140 29138067 27818062 27258280
               29218275