

000 

WWUS20 KWNS 120058

SEL2

SPC WW 120058

COZ000-KSZ000-NEZ000-120500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 822

NWS STORM PREDICTION CENTER NORMAN OK

800 PM CDT MON AUG 11 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST CENTRAL COLORADO

       NORTHWEST KANSAS

       EXTREME SOUTHWEST NEBRASKA



EFFECTIVE THIS MONDAY NIGHT FROM 800 PM UNTIL MIDNIGHT 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST

NORTHWEST OF MCCOOK NEBRASKA TO 55 MILES SOUTH SOUTHEAST OF

BURLINGTON COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 821...



DISCUSSION...A SMALL MCS IN NE CO WILL LIKELY PERSIST FOR A FEW

HOURS WHILE MOVING SSEWD TOWARD NW/W CENTRAL KS AND E CENTRAL CO.

MODERATE INSTABILITY...RESIDUAL STEEP LOW-LEVEL LAPSE RATES...AND

EFFECTIVE BULK SHEAR AROUND 35 KT SHOULD SUPPORT A CONTINUED

DAMAGING WIND AND HAIL THREAT BEFORE THE STORMS WEAKEN LATER

TONIGHT.



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 34035.





...THOMPSON

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