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000 

WWUS20 KWNS 291831

SEL4

SPC WW 291831

COZ000-KSZ000-NEZ000-300200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 304

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM MDT TUE MAY 29 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL

800 PM MDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTHWEST OF DENVER

COLORADO TO 25 MILES EAST NORTHEAST OF MCCOOK NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...STRONG/ISOLATED SEVERE STORMS CONTINUE TO

DEVELOP/INTENSITY OVER PARTS OF SWRN NEB AND ALONG THE FRONT RANGE

IN CO.  ACTIVITY IS ASSOCIATED WITH COLD FRONTAL BOUNDARY THAT WILL

MOVE SWD/SEWD THIS AFTERNOON INTO MODERATELY UNSTABLE AIR MASS.

MLCAPE IS 2000-2500 J/KG OVER SWRN NEB ATTM...AND BETWEEN 500-1500

J/KG OVER ERN CO.  DEEP LAYER SHEAR IS 40-45 KT WHICH IS FAVORABLE

FOR STRONG ROTATING UPDRAFTS AND THE POSSIBILITY OF ISOLATED

TORNADOES.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 23030.





...MCCARTHY

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