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Severe Thunderstorm Watch 654
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WW0654 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Low 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.
   SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 654
   NWS STORM PREDICTION CENTER NORMAN OK
   410 AM CDT TUE AUG 4 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EXTREME SOUTHERN IOWA
          WEST CENTRAL ILLINOIS
          NORTH CENTRAL AND NORTHEAST MISSOURI
   
   EFFECTIVE THIS TUESDAY MORNING FROM 410 AM UNTIL 1000 AM CDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   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 5 MILES NORTH OF
   SAINT JOSEPH MISSOURI TO 45 MILES EAST SOUTHEAST OF QUINCY
   ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
   
   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 653...
   
   DISCUSSION...A GROWING CLUSTER OF THUNDERSTORMS ACROSS NW MO HAS THE
   POTENTIAL TO DEVELOP A COLD POOL AND ACCELERATE EWD/SEWD THROUGH THE
   MORNING ACROSS NRN MO...WITH AN ACCOMPANYING RISK FOR DAMAGING
   WINDS.  LARGE HAIL WILL ALSO BE POSSIBLE ACROSS THE WATCH AREA GIVEN
   THE PRESENCE OF STEEP MID LEVEL LAPSE RATES AND MUCAPE OF 3000-4000
   J/KG.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
   MOTION VECTOR 28030.
   
   
   ...THOMPSON
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Page last modified: August 04, 2009
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