SEVERE THUNDERSTORM WATCH NUMBER 353

   SEL3          URGENT - IMMEDIATE BROADCAST REQUESTED     SEVERE THUNDERSTORM WATCH NUMBER 353     NWS STORM PREDICTION CENTER NORMAN OK     325 PM CDT MON JUN 4 2012          THE NWS STORM PREDICTION CENTER HAS ISSUED A     SEVERE THUNDERSTORM WATCH FOR PORTIONS OF                  SOUTHERN ILLINOIS            EXTREME SOUTHWEST INDIANA            WESTERN KENTUCKY            FAR EASTERN MISSOURI            NORTHWEST AND NORTH-CENTRAL TENNESSEE          EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 325 PM UNTIL     1000 PM CDT.          HAIL TO 1.5 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 85     STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF     ALTON ILLINOIS TO 25 MILES SOUTH SOUTHEAST OF CLARKSVILLE     TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE     ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).          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 352...          DISCUSSION...TSTMS WILL CONTINUE TO INCREASE AND SPREAD     SOUTHEASTWARD ACROSS THE REGION THROUGH THE LATE AFTERNOON AND     EVENING HOURS. WITH A WEAK SURFACE LOW NEAR ST LOUIS AT     MID-AFTERNOON...MUCH OF THIS DEVELOPMENT WILL BE FOCUSED     ALONG/SOUTHWEST OF A FRONTAL BOUNDARY THAT EXTENDS     NORTHWEST-SOUTHEAST ACROSS THE REGION. A FAVORABLE COMBINATION OF     SHEAR/INSTABILITY NEAR THE BOUNDARY LAYER WILL SUPPORT SUSTAINED     SEVERE TSTMS...MAINLY IN THE FORM OF MULTICELLS/PERHAPS SOME     SUPERCELLS...WITH DAMAGING WINDS/SEVERE HAIL. THESE STORMS MAY GROW     UPSCALE/EXPAND INTO THIS EVENING WITH A PERSISTENT DAMAGING WIND     THREAT CONTINUING INTO PARTS OF KY/TN.          AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT     TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60     KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM     MOTION VECTOR 33025.