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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