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824 

WWUS20 KWNS 181830

SEL1

SPC WW 181830

COZ000-KSZ000-NEZ000-190200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 501

NWS STORM PREDICTION CENTER NORMAN OK

130 PM CDT SAT JUN 18 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF EASTERN COLORADO

       PARTS OF WESTERN KANSAS

       PARTS OF WESTERN NEBRASKA



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 130 PM UNTIL

900 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 5 MILES NORTH

NORTHEAST OF ALLIANCE NEBRASKA TO 25 MILES SOUTH OF LA JUNTA

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 499...WW 500...



DISCUSSION...THUNDERSTORMS DEVELOPING IN RESPONSE TO APPROACH OF MID

LEVEL WAVE OVER WY AND STRONG HEATING.  WITH UPSLOPE FLOW...SHEAR

WILL BE FAVORABLE FOR SUPERCELLS.  STORMS WILL MOVE EWD WITH LARGE

HAIL AND DOWNBURST WINDS PRIMARY THREAT.



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.





...HALES

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