WATCHES: Tornado Watch Number 899

WWUS20 KWNS 221603
SEL9
SPC WW 221603
ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-222300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 899
NWS STORM PREDICTION CENTER NORMAN OK
1000 AM CST THU DEC 22 2011

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

ALABAMA
WESTERN FLORIDA PANHANDLE
FAR SOUTHEAST LOUISIANA
SOUTHEAST MISSISSIPPI
COASTAL WATERS

EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL
500 PM CST.

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 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES EAST OF GULFPORT
MISSISSIPPI TO 10 MILES NORTH OF GADSDEN ALABAMA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU9).

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 898...

DISCUSSION...CONVECTIVE BAND ALONG COLD FRONT FROM NEAR JAN TO W OF
NEW ORLEANS IS EXPECTED TO INTENSIFY TODAY WHILE MOVING EWD WITH
ADDITIONAL DOWNSTREAM STORM DEVELOPMENT ANTICIPATED WITHIN THE OPEN
WARM SECTOR. LATEST VISIBLE SATELLITE SHOWS BREAKS IN THE CLOUDS
ACROSS PARTS OF SRN AL...WHICH WHEN COUPLED WITH BOUNDARY LAYER
DEWPOINTS IN THE MID 60S WILL YIELD AFTERNOON MLCAPE VALUES OF
AROUND 1000 J/KG. THIS INSTABILITY WILL COINCIDE WITH A KINEMATIC
ENVIRONMENT FEATURING 0-1 KM SRH OF 150-300 M2/S2 AND EFFECTIVE BULK
SHEAR OF 40-50+ KT. AS SUCH...GIVEN SETUP WILL SUPPORT SUPERCELL
AND BOW ECHO STORM MODES WITH ATTENDANT RISKS FOR A FEW TORNADOES
AND DAMAGING WINDS.

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
400. MEAN STORM MOTION VECTOR 22035.

...MEAD

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