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316 

WWUS20 KWNS 312219

SEL9

SPC WW 312219

KSZ000-010600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 639

NWS STORM PREDICTION CENTER NORMAN OK

520 PM CDT TUE AUG 31 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL KANSAS



EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 520

PM UNTIL 100 AM 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH

NORTHEAST OF MANHATTAN KANSAS TO 60 MILES SOUTH SOUTHWEST OF

RUSSELL KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 638...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN BOTH NUMBER AND

INTENSITY THIS EVENING ALONG AND AHEAD OF SURFACE COLD FRONT WITHIN

A STEEP LAPSE RATE AND STRONGLY UNSTABLE ENVIRONMENT WITH MLCAPE OF

3000-4000 J/KG.  REGION RESIDES ALONG SRN FRINGE OF STRONGER MID AND

HIGH-LEVEL WIND FIELD ATTENDANT TO LARGE-SCALE N-CNTRL CONUS UPPER

TROUGH WITH GENERALLY 30-45 KT OF DEEP WSWLY SHEAR.  AS SUCH...SETUP

WILL FAVOR THE DEVELOPMENT OF ORGANIZED MULTICELL AND SOME SUPERCELL

STRUCTURES WITH THE THREAT FOR HAIL AND DAMAGING WIND GUSTS.



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.





...MEAD

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