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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 898

NWS STORM PREDICTION CENTER NORMAN OK

435 AM CST THU DEC 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN LOUISIANA

       SOUTHERN AND CENTRAL MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 435 AM UNTIL

100 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 90 MILES NORTH NORTHEAST OF

JACKSON MISSISSIPPI TO 20 MILES SOUTH OF INTRACOASTAL CITY

LOUISIANA.  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.



DISCUSSION...SSW-NNE SQLN NOW EVOLVING OVER THE SABINE RVR VLY

EXPECTED TO INCREASE IN EXTENT AND POSSIBLY INTENSITY AS THE LINE

CONTINUES EWD INTO REGION OF RAPID LOW LVL MOISTENING/WARMING AHEAD

OF TX SHORTWAVE TROUGH.  WELL-DEFINED JET EXIT REGION FORMING IN

RESPONSE TO AMPLIFICATION OF THE DOWNSTREAM UPR RDG WILL ENHANCE

LARGE SCALE ASCENT OVER LA/MS.  THIS MAY FOSTER DEVELOPMENT OF

ADDITIONAL STORMS AHEAD OF THE SQLN IN CONFLUENT LOW LVL SSWLY FLOW.

STRENGTHENING WIND FIELD WILL SUPPORT EMBEDDED SUPERCELLS/LEWPS

WITHIN SQLN LINE...WITH AN ATTENDANT RISK FOR DMGG WIND/ISOLD

TORNADOES.  ISOLD TORNADOES ALSO WILL BE POSSIBLE WITH ANY STORMS

THAT FORM AHEAD OF SQLN.



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 21040.





...CORFIDI

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