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000 

WWUS20 KWNS 122223

SEL4

SPC WW 122223

COZ000-KSZ000-NEZ000-130600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 514

NWS STORM PREDICTION CENTER NORMAN OK

520 PM CDT THU JUL 12 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN COLORADO

       NORTHERN AND CENTRAL KANSAS

       SOUTHERN NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 520 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 190

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

NORTHWEST OF MCCOOK NEBRASKA TO 45 MILES SOUTH OF HILL CITY

KANSAS.  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 513...



DISCUSSION...BAND OF TSTMS IN SRN PART OF WW 513 SHOULD CONTINUE TO

MOVE/DEVELOP GENERALLY SSE INTO PARTS OF NE CO AND SRN NEB LATER

THIS EVENING... WITH ADDITIONAL ACTIVITY POSSIBLY FORMING AHEAD OF

LINE.  SFC-BASED INSTABILITY DECREASES WITH EWD EXTENT /FROM AROUND

2000 J/KG IN NE CO TO BELOW 1000 J/KG IN ERN PART OF WW/...WHILE

DEEP NWLY SHEAR INCREASES FROM AROUND 25 KTS IN CO TO NEAR 40 KTS IN

S CNTRL NEB.  OVERALL SETUP SUGGESTS CONTINUED THREAT FOR LARGE

HAIL/WIND IN WRN HALF OF WW...WITH A LOCAL HIGH WIND THREAT

PREDOMINATING FARTHER E.



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 500. MEAN STORM

MOTION VECTOR 32020.





...CORFIDI

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