

216 

WWUS20 KWNS 181127

SEL9

SPC WW 181127

ILZ000-INZ000-KYZ000-181700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 459

NWS STORM PREDICTION CENTER NORMAN OK

730 AM EDT THU JUN 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST ILLINOIS

       CENTRAL AND SOUTHERN INDIANA

       CENTRAL KENTUCKY



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 730 AM UNTIL

100 PM EDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES SOUTHEAST OF

LOUISVILLE KENTUCKY TO 50 MILES WEST SOUTHWEST OF TERRE HAUTE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 457...WW 458...



DISCUSSION...MATURE BOW ECHO TRACKING ACROSS CENTRAL IL IS LIKELY TO

PERSIST THROUGH THE MORNING HOURS AND TRACK INTO SOUTHERN IND AND

CENTRAL KY.  STORMS ARE MOVING ALONG A STRONG INSTABILITY GRADIENT

AND SHOW CONSIDERABLE MESOSCALE ORGANIZATION.  THIS IS EXPECTED TO

MAINTAIN RISK OF DAMAGING WINDS ACROSS THE WATCH AREA.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 31040.





...HART

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