

192 

WWUS20 KWNS 122207

SEL2

SPC WW 122207

COZ000-130500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 392

NWS STORM PREDICTION CENTER NORMAN OK

405 PM MDT FRI JUN 12 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN COLORADO



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 405 PM UNTIL

1100 PM MDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH

NORTHWEST OF AKRON COLORADO TO 30 MILES SOUTHWEST OF SPRINGFIELD

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 388...WW 389...WW

390...WW 391...



DISCUSSION...SCTD TSTMS EXPECTED TO INCREASE/DEVELOP OVER ERN CO

THIS EVE...POSING A THREAT FOR HAIL.  THE STORMS SHOULD FOCUS

FOREMOST ALONG THE PALMER DIVIDE S OF DENVER...AN AREA THAT APPEARS

TO BE COLLOCATED WITH A WEAKENING FRONTAL SURGE.  A FEW STORMS MAY

ALSO FORM ALONG WEAK FRONT NOW NEAR THE CO/WY BORDER...AND IN SE CO

/N OF STALLED STRONGER FRONT NEAR ROTAN DIVIDE/.  ALTHOUGH SATELLITE

SUGGESTS ONSET OF WEAK SHORTWAVE RIDGING ACROSS REGION

ATTM...EXISTING THERMODYNAMIC SETUP AND LOW LVL ASCENT ALONG

PREVIOUSLY-MENTIONED SFC FEATURES SHOULD DOMINATE THROUGH THE EVE.

POTENTIAL WILL EXIST FOR A FEW SUSTAINED STORMS/POSSIBLE SUPERCELLS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27030.





...CORFIDI

