

490 

WWUS20 KWNS 272343

SEL6

SPC WW 272343

ARZ000-TNZ000-280400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 966

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CST SAT DEC 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME EAST CENTRAL ARKANSAS

       WESTERN TENNESSEE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 545 PM UNTIL

1000 PM CST.



HAIL TO 1 INCH 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF

DYERSBURG TENNESSEE TO 50 MILES SOUTHWEST OF JACKSON TENNESSEE.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 962...WW 964...WW 965...



DISCUSSION...WELL-DEVELOPED SQUALL LINE WITH EMBEDDED BOW ECHOES

WILL LIKELY PERSIST FOR THE NEXT FEW HOURS WHILE MOVING FROM AR INTO

WRN TN.  STRONG AMBIENT FLOW AND VERTICAL SHEAR IN THE LOW LEVELS

WILL MAINTAIN A THREAT FOR DAMAGING WINDS BEFORE WEAKENING

INSTABILITY REDUCES THE SEVERE THREAT LATER TONIGHT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 26035.





...THOMPSON



490 

WWUS20 KWNS 272343

SEL6

SPC WW 272343

ARZ000-TNZ000-280400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 966

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CST SAT DEC 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME EAST CENTRAL ARKANSAS

       WESTERN TENNESSEE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 545 PM UNTIL

1000 PM CST.



HAIL TO 1 INCH 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF

DYERSBURG TENNESSEE TO 50 MILES SOUTHWEST OF JACKSON TENNESSEE.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 962...WW 964...WW 965...



DISCUSSION...WELL-DEVELOPED SQUALL LINE WITH EMBEDDED BOW ECHOES

WILL LIKELY PERSIST FOR THE NEXT FEW HOURS WHILE MOVING FROM AR INTO

WRN TN.  STRONG AMBIENT FLOW AND VERTICAL SHEAR IN THE LOW LEVELS

WILL MAINTAIN A THREAT FOR DAMAGING WINDS BEFORE WEAKENING

INSTABILITY REDUCES THE SEVERE THREAT LATER TONIGHT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 26035.





...THOMPSON

