

076 

WWUS20 KWNS 220048

SEL8

SPC WW 220048

COZ000-KSZ000-NEZ000-220600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 668

NWS STORM PREDICTION CENTER NORMAN OK

750 PM CDT THU JUL 21 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR EASTERN COLORADO

       NORTHWEST KANSAS

       SOUTHERN NEBRASKA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 750 PM

UNTIL 100 AM CDT.



HAIL TO 1 INCH 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 NORTH AND SOUTH OF A LINE FROM 40 MILES WEST

SOUTHWEST OF BURLINGTON COLORADO TO 60 MILES NORTHEAST OF RUSSELL

KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...MCS NOW FORMING IN E CNTRL CO EXPECTED TO MOVE MAINLY

NEWD ALONG AND N OF STALLED WSW-ENE FRONT OVER NW KS.  NOCTURNAL

STRENGTHENING OF LLJ...STEEP LOW LVL LAPSE RATES...INCREASING

MOISTURE WITH NWD EXTENT...AND MODEST WSW MID LVL FLOW SUGGEST

POTENTIAL FOR LOCALLY DMGG WIND GUSTS AND POSSIBLY MARGINALLY SVR

HAIL.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION

VECTOR 24020.





...CORFIDI

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