WATCHES: Severe Thunderstorm Watch Number 478

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

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