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Tornado Watch 899
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WW0899 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 899
   NWS STORM PREDICTION CENTER NORMAN OK
   430 PM CDT FRI SEP 12 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          EAST CENTRAL KANSAS
          WEST CENTRAL MISSOURI
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 430 PM UNTIL
   1000 PM CDT.
   
   TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
   TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH OF EMPORIA
   KANSAS TO 35 MILES EAST NORTHEAST OF KNOB NOSTER MISSOURI.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU9).
   
   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 898...
   
   DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG A SURFACE FRONT IN
   ERN KS AND FARTHER E IN THE WARM SECTOR ACROSS WRN MO.  THIS
   CONVECTION WILL SPREAD NEWD AND INTERACT WITH A MORE E-W ORIENTED
   BAROCLINIC ZONE NEAR THE MO RIVER.  WHILE INSTABILITY IS NOT
   PARTICULARLY LARGE /MLCAPE OF 500-1000 J/KG/...PROFILES ARE MOIST
   AND LOW-LEVEL SHEAR IS MAXIMIZED ALONG THE BOUNDARY /EFFECTIVE SRH
   OF 200-250 M2/S2/.  THIS ENVIRONMENT WILL SUPPORT THE THREAT FOR A
   FEW TORNADOES THROUGH THIS EVENING...BEFORE THE LOW LEVELS BEGIN TO
   STABILIZE AFTER SUNSET.
   
   AVIATION...TORNADOES AND 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 500.
   MEAN STORM MOTION VECTOR 21025.
   
   
   ...THOMPSON
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Page last modified: September 13, 2008
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