

195 

WWUS20 KWNS 281050

SEL1

SPC WW 281050

FLZ000-CWZ000-281600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 71

NWS STORM PREDICTION CENTER NORMAN OK

650 AM EDT MON MAR 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTH FLORIDA

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING FROM 650 AM UNTIL NOON EDT.



HAIL TO 1 INCH 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 45

STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES SOUTHWEST OF

FORT MEYERS FLORIDA TO 35 MILES SOUTHEAST OF VERO BEACH FLORIDA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...LONG-LIVED MCS WITH EMBEDDED BOWING STRUCTURES EXPECTED

TO CONTINUE GENERALLY ESE AT 25-30 KTS ACROSS CNTRL AND S FL.  WHILE

DEEP WIND FIELD IS MODERATE IN STRENGTH...HIGH PW VALUES AND

LIKELIHOOD FOR MERGING STORMS/LEWP STRUCTURES SUGGEST POTENTIAL FOR

A FEW POCKETS/SHORT SWATHS OF DMGG WIND AND POSSIBLY MARGINALLY SVR

HAIL.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 29030.





...CORFIDI

