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054 

WWUS20 KWNS 251459

SEL3

SPC WW 251459

ARZ000-LAZ000-MSZ000-TXZ000-252200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 693

NWS STORM PREDICTION CENTER NORMAN OK

855 AM CST TUE DEC 25 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHERN ARKANSAS

       NORTHERN LOUISIANA

       EXTREME WESTERN MISSISSIPPI

       NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 855 AM UNTIL

400 PM CST.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST

OF LONGVIEW TEXAS TO 55 MILES EAST OF MONROE LOUISIANA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 691...WW 692...



DISCUSSION...SVR TSTMS WITH HAIL AND ISOLATED GUSTS SHOULD INCREASE

IN COVERAGE AND SHIFT ENEWD ACROSS WW AREA THROUGH AFTN...N OF SFC

WARM FRONT OVER SE TX AND SRN LA.  40-50 KT EFFECTIVE SHEAR

MAGNITUDES AND ELEVATED MUCAPE UP TO 1000 J/KG WILL SUPPORT TSTM

ORGANIZATION.



AVIATION...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 450. MEAN STORM

MOTION VECTOR 24040.





...EDWARDS

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