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421 

WWUS20 KWNS 181854

SEL4

SPC WW 181854

ILZ000-INZ000-KYZ000-190200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 324

NWS STORM PREDICTION CENTER NORMAN OK

155 PM CDT TUE JUN 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EAST CENTRAL ILLINOIS

  PARTS OF CENTRAL AND SOUTHERN INDIANA

  EXTREME NORTHERN KENTUCKY



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL

  900 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF

SPRINGFIELD ILLINOIS TO 30 MILES NORTH OF LOUISVILLE KENTUCKY.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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.



&&



DISCUSSION...VISIBLE SATELLITE IMAGERY SHOWS THE EARLY STAGES OF

THUNDERSTORM DEVELOPMENT ALONG THE SURFACE FRONT IN CENTRAL IL.

CONVECTION WILL INCREASE IN COVERAGE/INTENSITY THIS AFTERNOON AS

SURFACE HEATING CONTINUES AND A MIDLEVEL TROUGH MOVES SEWD FROM IA.

LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN THREATS.



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 31025.





...THOMPSON

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