

733 

WWUS20 KWNS 141022

SEL4

SPC WW 141022

FLZ000-CWZ000-141800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 154

NWS STORM PREDICTION CENTER NORMAN OK

615 AM EDT TUE APR 14 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN FLORIDA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 615 AM UNTIL

200 PM EDT.



TORNADOES...HAIL TO 1.5 INCHES 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 EITHER SIDE OF A LINE FROM 35 MILES SOUTHEAST OF DAYTONA

BEACH FLORIDA TO 30 MILES NORTHWEST OF SAINT PETERSBURG FLORIDA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...TSTMS IN THE NERN GULF OF MEXICO APPEAR TO BE AT LEAST

PARTLY ASSOCIATED WITH ENHANCED ASCENT ON SRN FRINGE OF SHORTWAVE

IMPULSE NOW ROUNDING BASE OF OH VLY TROUGH.  STRENGTHENING SW

FLOW/LOW LVL MOISTENING AHEAD OF STORM CLUSTER EXPECTED TO MAINTAIN

THE STORMS AS THEY CONTINUE GENERALLY E IN MEAN WLY FLOW.

ADDITIONAL STORMS MAY FORM AHEAD OF CLUSTER AS WAA INCREASES ATOP

SHALLOW COOL DOME OVER NRN HALF OF FL.  STRENGTH OF SHEAR AND

QUALITY OF MOISTURE SUGGEST POTENTIAL FOR ISOLD TORNADOES...GIVEN

PRESENCE OF SUSTAINED STORMS AND/OR FAVORABLE STORM INTERACTIONS.

OTHERWISE...SETUP APPEARS FAVORABLE FOR EMBEDDED ROTATING

STORMS/BOWING SEGMENTS WITH HIGH WIND/HAIL.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 26035.





...CORFIDI

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