

111 

WWUS20 KWNS 051356

SEL5

SPC WW 051356

FLZ000-CWZ000-052000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 795...RESENT

NWS STORM PREDICTION CENTER NORMAN OK

900 AM EST SAT DEC 5 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH AND SOUTHEAST FLORIDA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 900 AM UNTIL

300 PM EST.



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 90 STATUTE

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

KEY WEST FLORIDA TO 20 MILES EAST OF WEST PALM BEACH FLORIDA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 794. WATCH NUMBER 794 WILL NOT BE IN EFFECT AFTER

900 AM EST.



DISCUSSION...ANOTHER BAND OF THUNDERSTORMS IN ADVANCE OF A SURFACE

COLD FRONT AND MID LEVEL TROUGH WILL MOVE INLAND ACROSS S FL THROUGH

THE MORNING AND INTO EARLY AFTERNOON.  WEAK-MODERATE INSTABILITY AND

EFFECTIVE BULK SHEAR OF 40-50 KT WILL FAVOR BOTH SUPERCELL AND

EMBEDDED BOW STRUCTURES WITH THE POTENTIAL TO PRODUCE DAMAGING GUSTS

AND A BRIEF TORNADO OR TWO.



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 26035.





...THOMPSON



988 

WWUS20 KWNS 051356

SEL5

SPC WW 051356

FLZ000-CWZ000-052000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 795

NWS STORM PREDICTION CENTER NORMAN OK

900 AM EST SAT DEC 5 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH AND SOUTHEAST FLORIDA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 900 AM UNTIL

300 PM EST.



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 90 STATUTE

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

KEY WEST FLORIDA TO 20 MILES EAST OF WEST PALM BEACH FLORIDA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 794. WATCH NUMBER 794 WILL NOT BE IN EFFECT AFTER

900 AM EST.



DISCUSSION...ANOTHER BAND OF THUNDERSTORMS IN ADVANCE OF A SURFACE

COLD FRONT AND MID LEVEL TROUGH WILL MOVE INLAND ACROSS S FL THROUGH

THE MORNING AND INTO EARLY AFTERNOON.  WEAK-MODERATE INSTABILITY AND

EFFECTIVE BULK SHEAR OF 40-50 KT WILL FAVOR BOTH SUPERCELL AND

EMBEDDED BOW STRUCTURES WITH THE POTENTIAL TO PRODUCE DAMAGING GUSTS

AND A BRIEF TORNADO OR TWO.



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 26035.





...THOMPSON

