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WWUS20 KWNS 110052

SEL5

SPC WW 110052

COZ000-KSZ000-NEZ000-110600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 765

NWS STORM PREDICTION CENTER NORMAN OK

650 PM MDT WED AUG 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHEAST AND EAST CENTRAL COLORADO

       NORTHWEST KANSAS

       EXTREME SOUTHWEST NEBRASKA



EFFECTIVE THIS WEDNESDAY NIGHT FROM 650 PM UNTIL MIDNIGHT MDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES NORTHWEST OF

BURLINGTON COLORADO TO 50 MILES SOUTH SOUTHEAST OF MCCOOK

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 764...



DISCUSSION...SUPERCELLS OVER NERN CO ARE EXPECTED TO SPREAD SEWD

THIS EVENING INTO THE LOW LEVEL MOIST AXIS WHERE MLCAPE OF 1000 J/KG

IS COMMON.  STRONG WESTERLY MID/UPPER LEVEL FLOW /40 KT AT 500 MB/

AND ASSOCIATED DEEP LAYER SHEAR OF 45-50 KT WILL PROMOTE CONTINUED

DEVELOPMENT OF STRONG/SEVERE STORMS INCLUDING SUPERCELLS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 31025.





...WEISS

