

789 

WWUS20 KWNS 112000

SEL0

SPC WW 112000

COZ000-OKZ000-120300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 380

NWS STORM PREDICTION CENTER NORMAN OK

200 PM MDT THU JUN 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN COLORADO

       THE EXTREME WESTERN OKLAHOMA PANHANDLE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 200 PM UNTIL

900 PM MDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES EAST NORTHEAST OF

DENVER COLORADO TO 45 MILES SOUTHWEST OF ELKHART KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 375...WW 376...WW

377...WW 378...WW 379...



DISCUSSION...ONGOING STORMS E/SE OF DENVER WILL LIKELY PERSIST

THROUGH THE AFTERNOON...WHILE ADDITIONAL STORMS FORM FARTHER S INVOF

THE HIGH TERRAIN DOWN TO THE RATON MESA.  A RELATIVELY MOIST UPSLOPE

FLOW OF LOW 50S DEW POINTS AND AFTERNOON TEMPERATURES IN THE 60S/LOW

70S WILL SUPPORT MLCAPE VALUES UP TO 1000 J/KG.  AT THE SAME

TIME...DEEP LAYER VERTICAL SHEAR AND LIFT WILL INCREASE OVER CO WITH

THE APPROACH OF A LEAD SHORTWAVE TROUGH EJECTING ENEWD AHEAD OF THE

MAIN TROUGH OVER UT/NRN AZ.  THESE FACTORS WILL CONTRIBUTE TO

INCREASING THUNDERSTORM COVERAGE AND THE POTENTIAL FOR SUPERCELLS

CAPABLE OF PRODUCING LARGE HAIL/DAMAGING WINDS...AND A COUPLE OF

TORNADOES.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 28020.





...THOMPSON

