WATCHES: Severe Thunderstorm Watch Number 540

WWUS20 KWNS 032001
SEL0
SPC WW 032001
COZ000-KSZ000-040300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 540
NWS STORM PREDICTION CENTER NORMAN OK
300 PM CDT FRI JUL 3 2009

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

EASTERN COLORADO
NORTHWEST KANSAS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
1000 PM CDT.

HAIL TO 1.5 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF
BURLINGTON COLORADO TO 55 MILES EAST NORTHEAST OF RUSSELL KANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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.

DISCUSSION...THROUGH LATE AFTERNOON...THUNDERSTORMS ARE EXPECTED TO
DEVELOP AND INCREASE NEAR LEE/THERMAL LOW AND ASSOCIATED WARM FRONT
SITUATED FROM ERN CO INTO NWRN KS. AIR MASS ACROSS THESE AREAS HAS
BECOME VERY HOT AND MODERATELY UNSTABLE WITH MLCAPE OF 1200-2000 J
PER KG AND DEEPLY MIXED BOUNDARY LAYER. LARGE SURFACE DEWPOINT
DEPRESSIONS SHOULD SUPPORT STRONG TO DAMAGING DOWNBURST WINDS AND
OUTFLOW DOMINANT STORMS. SOME ORGANIZATION POTENTIAL TO STORM
UPDRAFTS MAY EVOLVE WITH TIME AS STRONGER MID-LEVEL FLOW AND WEAK
SHORT WAVE DISTURBANCE DEVELOP EWD FROM CO/ROCKIES. THUS...EXPECT
INITIALLY ISOLATED STORMS TO INCREASE IN COVERAGE AND ORGANIZATION
WITH GREATER CHANCE FOR WIND AND SEVERE HAIL INTO THE EVENING HOURS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27015.

...CARBIN

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