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WWUS20 KWNS 032028

SEL8

SPC WW 032028

COZ000-KSZ000-NEZ000-040500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 478

NWS STORM PREDICTION CENTER NORMAN OK

225 PM MDT TUE JUL 3 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN COLORADO

       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 225 PM UNTIL

1100 PM MDT.



HAIL TO 2 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 95

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES EAST

SOUTHEAST OF MCCOOK NEBRASKA TO 30 MILES WEST OF PUEBLO COLORADO.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 477...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH LATER

THIS AFTERNOON THROUGH THIS EVENING AS HEATING CONTINUES INVOF

SWD-MOVING FRONTAL SURGE AND ALONG LEE TROUGH.  INITIAL ACTIVITY

ALONG THE FOOTHILLS/DIVIDES OF ERN CO SHOULD BE AUGMENTED BY

ADDITIONAL STORMS NEWD INTO NW KS/SW NEB LATE THIS AFTERNOON.

DEEPLY-MIXED ENVIRONMENT THROUGHOUT REGION SUGGESTS GOOD LIKELIHOOD

FOR STRONG COLD POOL DEVELOPMENT.  THIS SHOULD FOSTER UPSCALE GROWTH

INTO A SWD-MOVING MCS THIS EVENING...WITH AN ASSOCIATED THREAT FOR

WIND/HAIL.



AVIATION...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 550. MEAN STORM

MOTION VECTOR 35020.





...CORFIDI

