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WWUS20 KWNS 070129

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 860

NWS STORM PREDICTION CENTER NORMAN OK

825 PM CDT THU OCT 6 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST KANSAS

       EXTREME SOUTHWEST NEBRASKA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 825 PM

UNTIL 100 AM CDT.



HAIL TO 1.5 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF

IMPERIAL NEBRASKA TO 65 MILES SOUTH SOUTHEAST OF GOODLAND KANSAS.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 859...



DISCUSSION...ISOLATED STORMS HAVE DEVELOPED ALONG THE REMNANT

DRYLINE IN W CENTRAL KS...AND THESE STORMS WILL LIKELY

DEVELOP/MAINTAIN SUPERCELL STRUCTURES WHILE MOVING NNEWD GIVEN THE

STRONG VERTICAL SHEAR ENVIRONMENT.  MEANWHILE...THE COLD FRONT IS

MOVING EWD AND WILL SOON OVERTAKE THE DRYLINE...WITH SQUALL LINE

DEVELOPMENT EXPECTED BY 02-03Z.  THUS...WHILE AN ISOLATED TORNADO

COULD OCCUR IN THE NEXT HOUR...THE MAIN THREAT WILL TRANSITION TO

ISOLATED DAMAGING WINDS/LARGE HAIL WITH THE LINE BEFORE INSTABILITY

DIMINISHES.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 24045.





...THOMPSON

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