

978 

WWUS20 KWNS 111557

SEL9

SPC WW 111557

FLZ000-CWZ000-112300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 29

NWS STORM PREDICTION CENTER NORMAN OK

1100 AM EST THU MAR 11 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF CENTRAL FLORIDA PENINSULA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1100 AM UNTIL

600 PM EST.



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 60 MILES WEST NORTHWEST OF

SAINT PETERSBURG FLORIDA TO 30 MILES EAST NORTHEAST OF MELBOURNE

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



DISCUSSION...STRONG/VEERING SHEAR PROFILES COUPLED WITH A MOIST AND

MODESTLY UNSTABLE AIR MASS WILL SUPPORT SUPERCELL DEVELOPMENT MOVING

EWD OFF GULF ACROSS CENTRAL FL.  PRIMARY THREAT WILL BE TORNADOES

ASSOCIATED WITH ANY SUPERCELL.



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 27035.





...HALES

