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948 

WWUS20 KWNS 112042

SEL3

SPC WW 112042

KSZ000-OKZ000-TXZ000-120400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 463

NWS STORM PREDICTION CENTER NORMAN OK

340 PM CDT SAT JUN 11 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST KANSAS

       NORTHWEST OKLAHOMA AND THE OKLAHOMA PANHANDLE

       THE NORTHEAST TEXAS PANHANDLE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 340 PM UNTIL

1100 PM 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 NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH

NORTHWEST OF ELKHART KANSAS TO 50 MILES SOUTH SOUTHEAST OF ALVA

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 462...



DISCUSSION...CONVECTIVE INHIBITION IS WEAKENING ALONG AND N OF A

WARM FRONT IN THE TX PANHANDLE AND WRN OK...WHERE MODERATE

INSTABILITY COINCIDES WITH SUFFICIENT DEEP-LAYER SHEAR FOR

SUPERCELLS.  SURFACE-BASED THUNDERSTORM DEVELOPMENT WILL BECOME MORE

PROBABLE IN THE NEXT FEW HOURS...AND THERE WILL BE SOME POTENTIAL

FOR ONGOING ELEVATED STORMS TO ROOT IN THE BOUNDARY LAYER.

OTHERWISE...THE SUPERCELLS IN SE CO COULD EVENTUALLY GROW INTO A

CLUSTER AND MOVE EWD/ESEWD INTO THE WATCH AREA FROM THE W.  LARGE

HAIL AND DAMAGING WINDS WILL BE THE MAIN SEVERE THREATS INTO EARLY

TONIGHT.



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 28020.





...THOMPSON

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