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WWUS20 KWNS 092011

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SPC WW 092011

IAZ000-KSZ000-MOZ000-NEZ000-100300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 453

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT THU JUN 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR SOUTHERN IOWA

       NORTHEASTERN KANSAS

       NORTHWESTERN MISSOURI

       SOUTHEASTERN NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST OF

MANHATTAN KANSAS TO 55 MILES EAST OF CHILLICOTHE MISSOURI.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 450...WW 451...WW 452...



DISCUSSION...A FRONTAL BOUNDARY EXTENDED FROM NERN KS SWWD INTO

SOUTH CENTRAL KS WITH A WEAK SURFACE LOW LOCATED NEAR SLN. STORMS

ARE EXPECTED TO DEVELOP DURING THE NEXT HOUR OR SO AS CONVERGENCE

INCREASES AHEAD OF THE NEWD MOVING LOW. OTHER STORMS SHOULD ALSO

DEVELOP ALONG OUTFLOW BOUNDARIES LOCATED ACROSS NWRN MO. THE AIR

MASS ACROSS THE WATCH AREA IS STRONGLY UNSTABLE AND DEEP LAYER SHEAR

IS SUFFICIENT FOR INTENSE SUPERCELLS. WHILE LARGE HAIL WILL BE THE

MAIN THREAT ...VEERING WIND PROFILES IN THE LOWER 1-2 KM AND THE

MOIST BOUNDARY LAYER WOULD ALSO BE SUPPORTIVE OF TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24030.





...IMY

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