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925 

WWUS20 KWNS 102306

SEL1

SPC WW 102306

ILZ000-110500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 461

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT FRI JUN 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS



EFFECTIVE THIS FRIDAY NIGHT FROM 610 PM UNTIL MIDNIGHT CDT.



HAIL TO 2 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH

NORTHEAST OF PEORIA ILLINOIS TO 35 MILES SOUTH OF SPRINGFIELD

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...WW

459...WW 460...



DISCUSSION...CLUSTER OF STORMS OVER WESTERN IL IS EXPECTED TO TRACK

EASTWARD ACROSS THE WATCH AREA THIS EVENING.  VERTICAL SHEAR AND

CAPE DECREASE SLIGHTLY OVER THIS REGION COMPARED TO FARTHER

WEST...BUT A SUBTLE SHORTWAVE TROUGH AND AMPLE LOW LEVEL MOISTURE

SUGGEST THAT STORMS MAY MAINTAIN SEVERITY FOR SEVERAL MORE HOURS.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 27030.





...HART

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