WATCHES: Tornado Watch Number 108

WWUS20 KWNS 021858
SEL8
SPC WW 021858
ALZ000-FLZ000-GAZ000-CWZ000-030200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 108
NWS STORM PREDICTION CENTER NORMAN OK
300 PM EDT THU APR 2 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

SOUTHEAST ALABAMA
NORTH FLORIDA AND THE FLORIDA PANHANDLE
SOUTHERN GEORGIA
COASTAL WATERS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
1000 PM EDT.

TORNADOES...HAIL TO 2 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 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST NORTHWEST OF
PANAMA CITY FLORIDA TO 25 MILES EAST NORTHEAST OF JACKSONVILLE
FLORIDA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 103...TORNADO WATCH NUMBER 104. WATCH NUMBER 103 104
WILL NOT BE IN EFFECT AFTER 300 PM EDT. CONTINUE...WW 105...WW
106...WW 107...

DISCUSSION...A LARGE BAND OF THUNDERSTORMS IS EXPECTED TO PERSIST
THROUGH THE AFTERNOON/EVENING ACROSS N FL/S GA...WITH NEW
DEVELOPMENT LIKELY SPREADING INLAND FROM THE NE GULF. THE GREATER
THREAT FOR TORNADOES WILL BE WITH SURFACE-BASED CONVECTION ON THE
LEADING EDGE OF THE BAND...WHERE A GRADUAL INCREASE IN LOW-LEVEL
FLOW THROUGH THE AFTERNOON/EVENING WILL RESULT IN FAVORABLE VERTICAL
SHEAR FOR SUPERCELLS WITH A FEW TORNADOES. FARTHER W/N...SOMEWHAT
ELEVATED CONVECTION IS MORE PROBABLE TO THE N OF THE OUTFLOW
BOUNDARY WHICH REMAINS OFFSHORE. INCREASING WAA ABOVE THE SHALLOW
COLD POOL WILL SUPPORT A RISK OF LARGE HAIL AND POSSIBLY DAMAGING
WINDS WITH THE STRONGER STORMS ACROSS THE FL PANHANDLE AND SE AL/SW
GA.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24035.

...THOMPSON

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