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000 

WWUS20 KWNS 022208

SEL4

SPC WW 022208

ARZ000-LAZ000-MSZ000-030500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 254

NWS STORM PREDICTION CENTER NORMAN OK

510 PM CDT FRI MAY 2 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SMALL PART OF SOUTHERN ARKANSAS

       LARGE PART OF NORTHERN LOUISIANA

       PARTS OF CENTRAL MISSISSIPPI



EFFECTIVE THIS FRIDAY AFTERNOON FROM 510 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 3 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 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH SOUTHWEST OF

SHREVEPORT LOUISIANA TO 15 MILES SOUTHEAST OF JACKSON

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 251...WW 252...WW 253...



DISCUSSION...A VERY UNSTABLE AIRMASS WITH MLCAPES AOA 3000 J/KG

COUPLE WITH STRONG VEERING SHEAR PROFILES SUPPORTS SUPERCELL

DEVELOPMENT.  AS STRONG JET MAX ROTATES ACROSS LOWER MS VALLEY THIS

EVENING...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY EWD

ACROSS THE WATCH. TORNADOES AND VERY LARGE HAIL WILL BE POSSIBLE

WITH ANY SUPERCELL.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24030.





...HALES

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