

824 

WWUS20 KWNS 011729

SEL0

SPC WW 011729

FLZ000-CWZ000-020100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 100

NWS STORM PREDICTION CENTER NORMAN OK

125 PM EDT WED APR 1 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF THE NORTHERN AND CENTRAL FLORIDA PENINSULA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 125 PM UNTIL

900 PM EDT.



HAIL TO 1.5 INCHES 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH OF

GAINESVILLE FLORIDA TO 30 MILES WEST SOUTHWEST OF ORLANDO

FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...TSTMS ARE EXPECTED TO DEVELOP THIS AFTERNOON ALONG

DIFFERENTIAL HEATING/OUTFLOW BOUNDARY SITUATED ACROSS THE NRN

PENINSULA.  ADDITIONAL...ONGOING STORMS OVER THE NERN GULF OF MEXICO

SHOULD MOVE INTO THE BIG BEND AREA THIS AFTERNOON...AND EVENTUALLY

ACROSS THE PENINSULA LATER TODAY.  GIVEN THE MOIST/MODERATELY

UNSTABLE AIR MASS AND 40-50+ KT OF DEEP-LAYER SHEAR...ENVIRONMENT

WILL BE FAVORABLE FOR THE DEVELOPMENT OF ORGANIZED TSTMS...INCLUDING

SUPERCELLS AND/OR BOWS WITH THE THREAT FOR HAIL AND DAMAGING WIND

GUSTS.



AVIATION...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 28030.





...MEAD/THOMPSON

