SPC Tornado Watch 423

WW 423 TORNADO FL CW 242345Z - 250900Z
URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 423 NWS STORM PREDICTION CENTER NORMAN OK 745 PM EDT SUN JUN 24 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF WESTERN AND CENTRAL FLORIDA PENINSULA COASTAL WATERS EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 745 PM UNTIL 500 AM EDT. TORNADOES...HAIL TO 0.5 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 50 STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF CROSS CITY FLORIDA TO 30 MILES SOUTHEAST OF NAPLES FLORIDA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). 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 422... DISCUSSION...BASED ON LATEST NHC GUIDANCE...TROPICAL STORM DEBBY IS EXPECTED TO DRIFT SLOWLY NWD TONIGHT WITH ASSOCIATED STRONG LOW-LEVEL WIND FIELD /AND RESULTANT SHEAR/ PERSISTING ACROSS THE WATCH AREA. GIVEN 0-1 KM SRH OF 250-450 M2/S2 --PER LOCAL VAD DATA-- AND A MOIST/LOW LCL BOUNDARY LAYER...ENVIRONMENT WILL REMAIN SUPPORTIVE OF SUPERCELLS CAPABLE OF TORNADOES. THIS IS ESPECIALLY THE CASE INVOF WARM FRONT --CURRENTLY FROM N OF TPA TO MLB-- WHERE LOW-LEVEL SHEAR/VORTICITY WILL BE FURTHER ENHANCED. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 18035. ...MEAD Read more

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