

000 

WWUS20 KWNS 131643

SEL6

SPC WW 131643

FLZ000-CWZ000-132300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 56

NWS STORM PREDICTION CENTER NORMAN OK

1145 AM EST WED FEB 13 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN FLORIDA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1145 AM UNTIL

600 PM EST.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTHEAST OF

KEY WEST FLORIDA TO 55 MILES NORTHEAST OF WEST PALM BEACH

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...E/W BOUNDARY FROM NEAR MIA TO W COAST EXPECTED TO BE

FOCUS FOR DEVELOPMENT OF SEVERE THUNDERSTORMS.  WITH MLCAPES S OF

BOUNDARY TO 1000 J/KG AND 40KT OF DEEP LAYER SHEAR...STORMS WILL

EVOLVE INTO SHORT LINE SEGMENTS AND POSSIBLE ISOLATED SUPERCELLS.

PRIMARY THREAT EXPECTED TO BE DAMAGING WINDS WITH POSSIBLE

WATERSPOUT/BRIEF TORNADOES.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24025.





...HALES

