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Tornado Watch posted for IL and MO

URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 841 NWS STORM PREDICTION CENTER NORMAN OK 350 PM CST SAT NOV 5 2005 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF WESTERN AND PART OF CENTRAL ILLINOIS CENTRAL AND EASTERN MISSOURI EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 350 PM UNTIL 1000 PM CST. 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 85 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTHWEST OF VICHY MISSOURI TO 55 MILES NORTH NORTHEAST OF QUINCY 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...POTENT SHORTWAVE TROUGH NOW MOVING ACROSS KS WILL LIKELY SUPPORT INCREASED SEVERE THUNDERSTORMS OVER WW THIS EVENING AS AIR MASS REMAINS MARGINAL TO MODERATELY UNSTABLE. INITIATION WILL LIKELY OCCUR NEAR LOW CENTER EXPECTED TO DEEPEN INTO NERN MO THIS EVENING AND NEAR EWD MOVING SURFACE COLD FRONT. PRIMARY SEVERE THREATS WILL BE DAMAGING WINDS AND LARGE HAIL AS STORMS EVOLVE INTO A SQUALL LINE. HOWEVER...SIGNIFICANT SHEAR AND BACKED SURFACE WINDS NEAR THE LOW CENTER WILL ALSO SUPPORT A THREAT OF A FEW TORNADOES WITH ANY SUPERCELLS/LEWP STRUCTURES. 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 500. MEAN STORM MOTION VECTOR 25035.


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