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Tornado Watch 342
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WW0342 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate Moderate
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
High Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 342
   NWS STORM PREDICTION CENTER NORMAN OK
   350 PM CDT SUN JUN 7 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          SOUTHWEST IOWA
          NORTHEAST KANSAS
          NORTHWEST MISSOURI
          SOUTHEAST NEBRASKA
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 350 PM UNTIL
   1100 PM 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 90 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF
   BEATRICE NEBRASKA TO 70 MILES NORTHEAST OF SAINT JOSEPH MISSOURI.
    FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU2).
   
   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 341...
   
   DISCUSSION...APPARENTLY SURFACE-BASED CONVECTION IS BEGINNING TO
   DEVELOP ALONG THE SE NEB/NE KS BORDER IMMEDIATELY IN ADVANCE OF A
   SURFACE WAVE ON THE FRONT...AND IN AN AREA OF STRONG INSTABILITY. 
   DESPITE THE WARMING NOTED IN THE 850-700 MB LAYER IN THE 19Z TOP AND
   20Z VORTEX2 SPECIAL SOUNDING IN SE NEB...COOLING IS LIKELY OCCURRING
   FROM THE W WITH THE CLOUD BAND AND AN ASSOCIATED SHORTWAVE TROUGH
   EJECTING NEWD OVER CENTRAL KS.  GIVEN THIS EARLY
   DEVELOPMENT...THUNDERSTORM COVERAGE WILL LIKELY INCREASE THROUGH THE
   AFTERNOON/EVENING.  THE STORM ENVIRONMENT IS FAVORABLE FOR
   SUPERCELLS WITH VERY LARGE HAIL GIVEN STEEP MID LEVEL LAPSE
   RATES...MLCAPE OF 2500-3500 J/KG...AND STRONG DEEP LAYER VERTICAL
   SHEAR.  ADDITIONALLY...BOUNDARY LAYER DEWPOINTS IN THE UPPER 60S AND
   BACKING/STRENGTHENING LOW-LEVEL FLOW WILL CONTRIBUTE TO AN
   INCREASINGLY FAVORABLE ENVIRONMENT FOR A FEW TORNADOES THROUGH LATE
   EVENING.
   
   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 25030.
   
   
   ...THOMPSON
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