WATCHES: Severe Thunderstorm Watch Number 481

WWUS20 KWNS 152021
SEL1
SPC WW 152021
COZ000-KSZ000-160400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 481
NWS STORM PREDICTION CENTER NORMAN OK
220 PM MDT THU JUL 15 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

MUCH OF EASTERN COLORADO
FAR NORTHWEST KANSAS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
1000 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF
LIMON COLORADO TO 40 MILES EAST SOUTHEAST OF TRINIDAD COLORADO.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 479...WW 480...

DISCUSSION...FAVORABLE UPSLOPE REGIME WILL SUPPORT THE DEVELOPMENT
OF WIDELY SCATTERED TSTMS THROUGH THE REMAINDER OF THE AFTERNOON
INTO THIS EVENING. AMBIENT BOUNDARY LAYER IS RATHER MOIST WITH
DEWPOINTS IN THE 50S TO LOW/MID 60S AND WHEN COUPLED WITH A STEEP
LAPSE RATE ENVIRONMENT...AIR MASS HAS BECOME MODERATELY UNSTABLE
WITH MLCAPE OF 1000-2500 J/KG. WHILE MID AND HIGH-LEVEL WIND FIELD
IS NOT PARTICULARLY STRONG...PRONOUNCED VEERING WINDS WITH HEIGHT
AND RESULTANT 30-35 KT OF EFFECTIVE BULK SHEAR WILL SUPPORT ROTATING
STORMS WITH THE THREAT FOR LARGE HAIL AND LOCALLY DAMAGING WIND
GUSTS.

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 500. MEAN STORM
MOTION VECTOR 33020.

...MEAD

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