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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 186

NWS STORM PREDICTION CENTER NORMAN OK

230 PM CDT SAT APR 23 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHERN ILLINOIS

       EXTREME SOUTHERN INDIANA

       WESTERN AND CENTRAL KENTUCKY



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

700 PM CDT.



TORNADOES...HAIL TO 2 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 40 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH OF PADUCAH

KENTUCKY TO 105 MILES EAST OF OWENSBORO KENTUCKY.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU6).



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.



DISCUSSION...A PERSISTENT MCS HAS BECOME MORE ORGANIZED EARLY THIS

AFTERNOON...AND WILL TRACK EAST-NORTHEASTWARD ALONG REMNANT OUTFLOW

BOUNDARY.  THIS SETUP SUGGESTS THE POTENTIAL FOR BOW ECHO

DEVELOPMENT WITH DAMAGING WINDS AND LARGE HAIL POSSIBLE.

ALSO...FAVORABLE LOW LEVEL SHEAR AND CONVERGENCE ALONG BOUNDARY WILL

POSE THE RISK OF A FEW TORNADOES ON THE LEADING EDGE OF THE

MCS...AND WITH ISOLATED CELLS AHEAD OF THE MAIN LINE.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 25040.





...HART

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