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Severe Thunderstorm Watch 479
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WW0479 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 479
   NWS STORM PREDICTION CENTER NORMAN OK
   140 PM CDT FRI JUN 19 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHERN IOWA
          EXTREME NORTHEAST KANSAS
          NORTHERN MISSOURI
          SOUTHEAST NEBRASKA
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 140 PM UNTIL 900
   PM CDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH OF
   SHENANDOAH IOWA TO 15 MILES EAST NORTHEAST OF OTTUMWA IOWA.  FOR
   A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU9).
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 477...WW 478...
   
   DISCUSSION...STORMS ARE GRADUALLY INCREASING FROM EXTREME NORTHEAST
   KS INTO SOUTHEAST NE...AND INTENSIFICATION OF ACTIVITY IS LIKELY
   THIS AFTERNOON IN RESPONSE TO UPPER SHORT WAVE TROUGH APPROACHING
   FROM THE WEST.  ENVIRONMENT IS VERY UNSTABLE WITH MLCAPE TO 3000
   J/KG...AND STRONG SWLY FLOW ALOFT IS RESULTING IN DEEP LAYER SHEAR
   OF 40-50 KT.  THIS WILL PROMOTE DEVELOPMENT OF STORMS WITH SUPERCELL
   AND BOW ECHO STRUCTURES...WITH ACTIVITY EVENTUALLY DEVELOPING INTO A
   FORWARD-PROPAGATING MCS AS COLD POOLS MERGE AND GROW UPSCALE. 
   PRIMARY THREAT EXPECTED TO BE DAMAGING WIND GUSTS ALTHOUGH LARGE
   HAIL AND AN ISOLATED TORNADO ARE ALSO POSSIBLE.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
   MOTION VECTOR 24035.
   
   
   ...WEISS
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