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Severe Thunderstorm Watch 509
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WW0509 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Very 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 509
   NWS STORM PREDICTION CENTER NORMAN OK
   1250 PM CDT THU JUN 25 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN IOWA
          NORTHWEST ILLINOIS
          EXTREME SOUTHWEST WISCONSIN
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
   700 PM 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 70
   STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHWEST OF
   DUBUQUE IOWA TO 25 MILES SOUTH OF PEORIA ILLINOIS.  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 508...
   
   DISCUSSION...THUNDERSTORMS EXPECTED TO CONTINUE INCREASING IN
   COVERAGE AND INTENSITY GIVEN VERY UNSTABLE AIR MASS AS AREA IS
   SKIRTED BY LARGE SCALE ASCENT ASSOCIATED WITH GREAT LAKES UPPER
   TROUGH.  LOW LEVEL SHEAR/FLOW IS WEAK...THOUGH UPPER LEVEL NWLY
   WINDS SHOULD ENHANCE THE POTENTIAL FOR A FEW SEVERE
   STORMS...INCLUDING ORGANIZATION INTO CLUSTERS/LINES.  LARGE HAIL AND
   DAMAGING WINDS WILL BE PRIMARY SEVERE THREATS AS STORMS PERSIST INTO
   THE EVENING.
   
   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 500. MEAN STORM
   MOTION VECTOR 32015.
   
   
   ...EVANS
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