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771 

WWUS20 KWNS 112134

SEL4

SPC WW 112134

COZ000-KSZ000-NEZ000-WYZ000-120500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 464

NWS STORM PREDICTION CENTER NORMAN OK

335 PM MDT SAT JUN 11 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       NORTHWEST KANSAS

       WESTERN NEBRASKA

       SOUTHEAST WYOMING



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 335 PM UNTIL

1100 PM MDT.



HAIL TO 2.5 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES WEST

NORTHWEST OF CHADRON NEBRASKA TO 65 MILES SOUTH OF BURLINGTON

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...WW 463...



DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE TO

INTENSIFY OVER THE HIGH PLAINS OF NORTHEAST CO AND SOUTHEAST

WY...AND SPREAD EASTWARD THROUGH THE LATE AFTERNOON AND EVENING.

MODERATE INSTABILITY AND SUFFICIENT VERTICAL SHEAR WILL SUPPORT

ORGANIZED AND OCCASIONAL SUPERCELL STORMS CAPABLE OF LARGE HAIL AND

DAMAGING WINDS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27030.





...HART

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