MESOSCALE DISCUSSION 0476
   NWS STORM PREDICTION CENTER NORMAN OK
   0636 AM CDT TUE APR 14 2009
   
   AREAS AFFECTED...NORTH CENTRAL FL PENINSULA
   
   CONCERNING...TORNADO WATCH 154...
   
   VALID 141136Z - 141230Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 154 CONTINUES.
   
   TORNADO WATCH 154 CONTINUES ACROSS THE NORTH CENTRAL FL PENINSULA
   UNTIL 18Z...WITH A RISK FOR TORNADOES/DAMAGING WINDS...ALONG WITH
   HAIL.
   
   LONG LIVED/HIGH ORGANIZED SQUALL LINE/LEWP...INCLUDING AT LEAST
   THREE EMBEDDED BOOKEND VORTICES...CONTINUES TO ADVANCE
   EAST-NORTHEASTWARD ACROSS THE EASTERN GULF TOWARD THE NORTHWEST/WEST
   CENTRAL FL PENINSULA AT AROUND 40 KT AS OF 1130Z.
   ACCORDINGLY...SEVERE POTENTIAL WILL LIKELY INCREASE OVER THE NEXT
   FEW HOURS AS THE MCS AND/OR LEADING DEVELOPMENT MOVE ONSHORE. AHEAD
   OF THIS ACTIVITY...A GRADUALLY WARMING/MOISTENING BOUNDARY
   LAYER...ALONG WITH EAST-SOUTHEASTERLY LOW LEVEL FLOW/ESTIMATED 0-1
   KM SRH OF 200-300 MS/S2...WILL SUPPORT A SUSTAINED SEVERE RISK
   THROUGH THE MORNING INCLUDING BOWING STRUCTURES AND EMBEDDED OR
   PERHAPS QUASI-DISCRETE/LINE LEADING SUPERCELLS.
   
   ..GUYER.. 04/14/2009
   
   
   ATTN...WFO...MLB...TBW...JAX...TAE...
   
   LAT...LON   28778341 29618290 29698194 29238085 27868092 27308291
               28778341