

900 

WWUS20 KWNS 201524

SEL0

SPC WW 201524

ALZ000-FLZ000-GAZ000-CWZ000-210000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 690

NWS STORM PREDICTION CENTER NORMAN OK

920 AM CST THU DEC 20 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST ALABAMA

       THE FLORIDA PANHANDLE

       SOUTHWEST GEORGIA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 920 AM UNTIL 600

PM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHWEST OF ALBANY

GEORGIA TO 45 MILES SOUTH SOUTHWEST OF PANAMA CITY FLORIDA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 689...



DISCUSSION...BAND OF DISCRETE SUPERCELLS FORMING IN CORRIDOR OF

STRONG PRE-COLD FRONTAL WAA OVER SRN AL/FAR WRN FL PANHANDLE

EXPECTED TO CONTINUE EWD THROUGH MID AFTN. WHILE ATMOSPHERE OVER

CNTRL/ERN PORTIONS OF THE FL PANHANDLE AND S GA ATTM REMAINS

COMPARATIVELY STABLE RELATIVE TO POINTS W...SATELLITE DATA...SFC

OBS...AND MODEL FCSTS SUGGEST THAT APPRECIABLE DESTABILIZATION WILL

OCCUR LATER TODAY AS FRONTAL SYSTEM CONTINUES EWD AND AS MODERATE

SFC HEATING OCCURS AHEAD OF IT. GIVEN STRENGTH OF LOW TO MID-LVL

WIND PROFILES AND PRESENCE OF EXISTING LONG-LIVED STORMS...IT

APPEARS THAT A SUFFICIENT RISK FOR TORNADOES WILL BE PRESENT TO

WARRANT ISSUANCE OF A TORNADO WW. AREA N OF THIS WW WILL BE

MONITORED FOR POSSIBLE WW ISSUANCE LATER THIS MORNING OR DURING THE

EARLY AFTN SHOULD IT APPEAR THAT SIGNIFICANT DESTABILIZATION ALSO

WILL OCCUR IN CNTRL PARTS OF GA.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.

MEAN STORM MOTION VECTOR 23035.





...CORFIDI

