

939 

WWUS20 KWNS 102245

SEL3

SPC WW 102245

COZ000-KSZ000-NEZ000-110500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 293

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT THU JUN 10 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF NORTHEAST COLORADO

       LARGE PART OF NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON FROM 545 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 3.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH OF DENVER

COLORADO TO 50 MILES NORTH NORTHEAST OF RUSSELL KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 292...



DISCUSSION...VERY TO EXTREMELY UNSTABLE AIR MASS STREAMING NNWWD

THRU CENTRAL KS INTO SWRN NEB.  WITH MLCAPE AOA 4000 J/KG AND

EXPECTED INCREASE IN THE LOW LEVEL JET BY THIS EVENING TO

40KT...SEVERE THUNDERSTORMS SHOULD RAPIDLY DEVELOP N AND E ACROSS

THE WATCH AREA. PRIMARY THREAT INITIALLY WILL BE VERY LARGE HAIL AND

DAMAGING DOWNBURST WINDS...WITH INCREASING TORNADO THREAT BY AND

AFTER 00Z AS VEERING SHEAR PROFILES INCREASE IN CONCERT WITH THE LOW

LEVEL JET.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

600. MEAN STORM MOTION VECTOR 22025.





...HALES

