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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 531

NWS STORM PREDICTION CENTER NORMAN OK

125 PM CDT TUE JUN 21 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       LARGE PART OF CENTRAL AND SOUTHERN ILLINOIS

       PARTS OF WESTERN KENTUCKY

       PARTS OF EASTERN MISSOURI



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 125 PM UNTIL

800 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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES EAST SOUTHEAST OF

POPLAR BLUFF MISSOURI TO 40 MILES NORTHWEST OF CHAMPAIGN

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...THE VERY MOIST/MDTLY UNSTABLE AIR MASS ACROSS THE WATCH

HAS BECOME UNCAPPED.  WITH 40KT OF SHEAR COUPLED WITH ENHANCED

ASCENT AHEAD OF MCV MOVING NEWD FROM SRN MO...SEVERE THUNDERSTORMS

INCLUDING SUPERCELLS EXPECTED TO DEVELOP NNEWD JUST AHEAD OF COLD

FRONT ACROSS MO.  PRIMARY THREAT WILL BE LARGE HAIL/WIND

DAMAGE...BUT SHEAR SUPPORTS  TORNADOES WITH ANY SUPERCELL THAT

DEVELOPS.



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

550. MEAN STORM MOTION VECTOR 21035.





...HALES

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