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Severe Thunderstorm Watch 485
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WW0485 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate Very 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.
   SEL5
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 485
   NWS STORM PREDICTION CENTER NORMAN OK
   235 AM EDT SAT JUN 20 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHEAST ILLINOIS
          SOUTHERN INDIANA
          NORTHERN KENTUCKY
   
   EFFECTIVE THIS SATURDAY MORNING FROM 235 AM UNTIL 800 AM EDT.
   
   HAIL TO 1 INCH 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 35
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES EAST
   NORTHEAST OF LOUISVILLE KENTUCKY TO 20 MILES SOUTHWEST OF MOUNT
   VERNON ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
   
   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 483...WW 484...
   
   DISCUSSION...COLD FRONT ASSOCIATED WITH WI/IL UPR TROUGH HAS
   ACCELERATED ESE IN THE PAST SEVERAL HOURS AND OVERTAKEN EXISTING
   SW-NE CONFLUENCE BAND AND ASSOCIATED TSTMS.  THIS HAS RESULTED IN
   SOME INTENSIFICATION OF STORMS ALONG THE FRONT.  40-50 KT MEAN LOW
   TO MID LVL UNIDIRECTIONAL WLY FLOW ON S SIDE OF TROUGH WILL REMAIN
   OVER FRONTAL ZONE AND MAINTAIN THREAT FOR FORWARD-PROPAGATING/BOWING
   SEGMENTS WITH ISOLD DMGG WIND GUSTS...DESPITE TIME OF DAY.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
   A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
   VECTOR 28040.
   
   
   ...CORFIDI
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