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986 

WWUS20 KWNS 092140

SEL5

SPC WW 092140

ILZ000-MOZ000-100500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 455

NWS STORM PREDICTION CENTER NORMAN OK

440 PM CDT THU JUN 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST CENTRAL ILLINOIS

       NORTHEAST MISSOURI



EFFECTIVE THIS THURSDAY AFTERNOON FROM 440 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 25 MILES NORTHWEST OF

QUINCY ILLINOIS TO 70 MILES SOUTH SOUTHWEST OF QUINCY ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 450...WW 451...WW

452...WW 453...WW 454...



DISCUSSION...ISOLATED THUNDERSTORMS OVER NORTHEAST MO ARE EXPECTED

TO TRACK EAST-SOUTHEASTWARD ALONG AND NORTH OF REMNANT OUTFLOW

BOUNDARY ACROSS THE WATCH AREA THIS EVENING.  VERTICAL SHEAR WEAKENS

WITH EASTWARD EXTENT...WHICH MAY LIMIT HOW FAR EAST THE STORMS

REMAIN SEVERE.  NEVERTHELESS...STRONG INSTABILITY WILL SUPPORT A

RISK OF HAIL AND DAMAGING WINDS IN THE STRONGER CELLS.



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 27025.





...HART

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