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Severe Thunderstorm Watch 686
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WW0686 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
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.
   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 686
   NWS STORM PREDICTION CENTER NORMAN OK
   345 PM CDT SUN AUG 9 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHWEST AND CENTRAL IOWA
          NORTHEAST KANSAS
          NORTHWEST MISSOURI
          SOUTHEAST NEBRASKA
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
   1100 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 55
   STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES SOUTHWEST OF
   BEATRICE NEBRASKA TO 50 MILES NORTH OF OTTUMWA IOWA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU6).
   
   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 682...WW 683...WW
   684...WW 685...
   
   DISCUSSION...INITIALLY ELEVATED CONVECTION IN A BAND FROM CENTRAL KS
   INTO SWRN IA IS BEGINNING TO INTENSIFY BASED ON REMOTE SENSING DATA.
    ACTIVITY IS EXPECTED TO FURTHER INTENSIFY WITH INCREASING
   LIKELIHOOD OF A FEW SURFACE-BASED STORMS DEVELOPING WITHIN VERY
   UNSTABLE AIR MASS /MLCAPE 2000-3000 J PER KG/.  THE BAND IS ALONG
   THE SERN EDGE OF STRONGER FLOW ALOFT WITH SUFFICIENT VERTICAL SHEAR
   TO PROMOTE DEVELOPMENT OF SEVERE STORMS INCLUDING SUPERCELLS. 
   THREAT FOR DAMAGING WINDS AND LARGE HAIL WILL INCREASE THROUGH THE
   EVENING HOURS AS ACTIVITY MOVES NEWD/ENEWD 30-35 KT.
   
   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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