

265 

WWUS20 KWNS 290636

SEL0

SPC WW 290636

FLZ000-CWZ000-291500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 40

NWS STORM PREDICTION CENTER NORMAN OK

235 AM EDT MON MAR 29 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH FLORIDA

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING FROM 235 AM UNTIL 1100 AM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH SOUTHEAST OF

WEST PALM BEACH FLORIDA TO 40 MILES SOUTH OF NAPLES FLORIDA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 39...



DISCUSSION...TSTMS EXPECTED TO PERSIST THROUGH MID MORNING WITH WAA

ALONG A LOOSELY-ORGANIZED WSW-ENE BAND ACROSS S FL.  ACTIVITY MAY BE

ENHANCED BY GLANCING INFLUENCE OF INCREASING UVV/WIND FIELD

ASSOCIATED WITH LA/N CNTRL GULF UPR IMPULSE.  GIVEN EXISTING

STRENGTH OF LOW-LVL VERTICALLY-VEERING WIND FIELD...QUALITY OF

LOW-LVL MOISTURE...AND LIKELIHOOD FOR A FEW SEMI-DISCRETE

STORMS...SOME THREAT WILL EXIST FOR TORNADOES.



AVIATION...TORNADOES AND 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 25030.





...CORFIDI

