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Tornado Watch 619
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WW0619 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate 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.
   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 619
   NWS STORM PREDICTION CENTER NORMAN OK
   505 PM CDT FRI JUL 24 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHEAST AND EAST CENTRAL IOWA
          NORTHWEST ILLINOIS
          SOUTHWEST WISCONSIN
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 505 PM UNTIL
   1100 PM CDT.
   
   TORNADOES...HAIL TO 2.5 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 60 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTH OF WATERLOO
   IOWA TO 60 MILES SOUTH OF MADISON WISCONSIN.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU9).
   
   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...THIS TORNADO WATCH REPLACES SEVERE
   THUNDERSTORM WATCH NUMBER 616...TORNADO WATCH NUMBER 617. WATCH
   NUMBER 616 617 WILL NOT BE IN EFFECT AFTER 505 PM CDT.
   CONTINUE...WW 618...
   
   DISCUSSION...SUPERCELLS WILL CONTINUE TO DEVELOP IN THE ZONE OF
   ASCENT FOCUSED WHERE THE SURFACE COLD FRONT INTERSECTS A NNW-SSE
   ORIENTED OUTFLOW BOUNDARY FROM EARLIER CONVECTION ACROSS ERN IA. 
   LOW-LEVEL SHEAR AND MOISTURE ARE MAXIMIZED ALONG THIS
   BOUNDARY...WHERE DEEP LAYER SHEAR AND INSTABILITY BOTH FAVOR
   SUPERCELLS.  A FEW TORNADOES...ISOLATED VERY LARGE HAIL...AND
   DAMAGING WINDS WILL CONTINUE TO BE THREATS THROUGH EARLY TONIGHT AND
   THE FRONT AND AN ASSOCIATED MID LEVEL TROUGH MOVE SEWD FROM MN/WI
   TOWARD IA/NRN IL.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   500. MEAN STORM MOTION VECTOR 32020.
   
   
   ...THOMPSON
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