

222 

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

