

277 

WWUS20 KWNS 042028

SEL3

SPC WW 042028

ILZ000-INZ000-KYZ000-MOZ000-TNZ000-050300-



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.





...GUYER/CARBIN

