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066 

WWUS20 KWNS 052214

SEL5

SPC WW 052214

COZ000-NEZ000-WYZ000-060500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 665

NWS STORM PREDICTION CENTER NORMAN OK

515 PM CDT WED AUG 5 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF EASTERN COLORADO

       PARTS OF SOUTHERN NEBRASKA PANHANDLE

       PARTS OF SOUTHEAST WYOMING



EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 515 PM UNTIL MIDNIGHT CDT.



HAIL TO 2.5 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 55

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

NORTHWEST OF SIDNEY NEBRASKA TO 45 MILES WEST SOUTHWEST OF

SPRINGFIELD COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 664...



DISCUSSION...UPSLOPE FLOW OF MOIST/UNSTABLE AIR MASS WILL SUPPORT

THUNDERSTORMS MOVING EWD OFF THE HIGHER TERRAIN INTO THE PLAINS THIS

EVENING. 30-35 KT OF EFFECTIVE SHEAR AND MLCAPES UPWARDS TO 2500

J/KG COUPLED WITH STEEP LAPSE RATES WILL SUPPORT SEVERE

THUNDERSTORMS INCLUDING SUPERCELLS.  LARGE HAIL AND DAMAGING WINDS

WILL BE PRIMARY CONCERN...PARTICULARLY WITH ANY SUPERCELL ALONG WITH

BRIEF TORNADOS AND/OR LANDSPOUTS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27020.





...HALES

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