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000 

WWUS20 KWNS 062147

SEL7

SPC WW 062147

COZ000-KSZ000-NEZ000-070400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 667

NWS STORM PREDICTION CENTER NORMAN OK

450 PM CDT THU SEP 6 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST CENTRAL COLORADO

       NORTHWEST KANSAS

       SOUTHWEST INTO CENTRAL NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 450 PM UNTIL

1100 PM CDT.



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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF

BROKEN BOW NEBRASKA TO 50 MILES SOUTHEAST OF GOODLAND KANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY FROM WEST TO EAST ACROSS WW THIS EVENING AHEAD OF VIGOROUS

MID/UPPER LEVEL STORM SYSTEM.  STORMS MAY REMAIN SLIGHTLY BEHIND

SURFACE COLD FRONT.  HOWEVER...VERY STRONG SHEAR AND SUFFICIENT

INSTABILITY REMAIN IN PLACE FOR ORGANIZED STORMS...INCLUDING

SUPERCELLS AND SMALL LINES.  LARGE HAIL AND ISOLATED DAMAGING WINDS

ARE EXPECTED TO BE PRIMARY SEVERE THREATS.



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 26025.





...EVANS

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