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Tornado Watch 254
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WW0254 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL4
   
   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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Page last modified: May 02, 2008
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