

467 

WWUS20 KWNS 082040

SEL1

SPC WW 082040

ARZ000-KYZ000-MOZ000-TNZ000-VAZ000-090400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 271

NWS STORM PREDICTION CENTER NORMAN OK

440 PM EDT FRI MAY 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST ARKANSAS

       SMALL PART OF SOUTHERN KENTUCKY

       BOOTHEEL OF MISSOURI

       MUCH  OF TENNESSEE

       SMALL PART OF WESTERN VIRGINIA



EFFECTIVE THIS FRIDAY AFTERNOON FROM 440 PM UNTIL MIDNIGHT EDT.



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 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF

WALNUT RIDGE ARKANSAS TO 35 MILES NORTHEAST OF BRISTOL TENNESSEE.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 267...WW 268...WW

269...WW 270...



DISCUSSION...STRONG VEERING SHEAR PROFILES COUPLE WITH A MDTLY

UNSTABLE VERY MOIST AIR MASS PROVIDING FAVORABLE CONDITIONS FOR

SUPERCELL DEVELOPMENT.  IN ADDITION TO LARGE HAIL...TORNADOES WILL

BE POSSIBLE ANY SUPERCELL BOTH ALONG OLD OUTFLOW BOUNDARY AND IN

WARM SECTOR.



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

550. MEAN STORM MOTION VECTOR 24035.





...HALES

