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012 

WWUS20 KWNS 302109

SEL0

SPC WW 302109

ARZ000-MSZ000-TNZ000-310500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 640

NWS STORM PREDICTION CENTER NORMAN OK

410 PM CDT THU JUL 30 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST ARKANSAS

       MUCH OF NORTHERN MISSISSIPPI

       WESTERN AND PARTS OF MIDDLE TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON FROM 410 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF

OXFORD MISSISSIPPI TO 80 MILES NORTHEAST OF JACKSON TENNESSEE.

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 639...



DISCUSSION...SEVERAL ROTATING THUNDERSTORMS HAVE DEVELOPED VICINITY

MS RIVER AND WILL BE MOVING INTO A VERY MOIST AND FAVORABLY SHEARED

AIR MASS.  SUPERCELLS INCLUDING TORNADOES ARE LIKELY TO DEVELOP EWD

ACROSS THE WATCH THROUGH THE EVENING.



AVIATION...TORNADOES AND 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

500. MEAN STORM MOTION VECTOR 24035.





...HALES

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