

371 

WWUS20 KWNS 160538

SEL0

SPC WW 160538

ILZ000-MOZ000-161100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 430

NWS STORM PREDICTION CENTER NORMAN OK

1240 AM CDT TUE JUN 16 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST ILLINOIS

       EAST CENTRAL AND SOUTHEAST MISSOURI



EFFECTIVE THIS TUESDAY MORNING FROM 1240 AM UNTIL 600 AM CDT.



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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTHWEST

OF JEFFERSON CITY MISSOURI TO 20 MILES SOUTH SOUTHEAST OF MOUNT

VERNON ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 427...WW 428...WW 429...



DISCUSSION...INTENSE BOW ECHO OVER CENTRAL MO WILL TRACK EASTWARD AT

OVER 40 KNOTS ACROSS EASTERN MO INTO WESTERN IL OVERNIGHT.  EASTERN

EXTENT OF DAMAGING WIND THREAT IS UNCERTAIN DUE TO TIME OF DAY AND

LESS INSTABILITY AHEAD OF STORMS.  HOWEVER...POTENTIAL EXISTS FOR

WIDESPREAD DAMAGING WINDS FOR SEVERAL MORE HOURS.



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 27040.





...HART

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