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614 

WWUS20 KWNS 251929

SEL1

SPC WW 251929

COZ000-NEZ000-WYZ000-260200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 511

NWS STORM PREDICTION CENTER NORMAN OK

130 PM MDT THU JUN 25 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL INTO NORTHEAST COLORADO

       NEBRASKA PANHANDLE

       SOUTHEAST WYOMING



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 130 PM UNTIL

800 PM MDT.



HAIL TO 2 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 70

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

TORRINGTON WYOMING TO 10 MILES SOUTHWEST OF LIMON COLORADO.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 508...WW 509...WW 510...



DISCUSSION...STRONG TO SEVERE THUNDERSTORM DEVELOPMENT WILL CONTINUE

ALONG THE FRONT RANGE FROM CENTRAL CO INTO SERN WY...WITH STORMS

SHIFTING EWD INTO MODERATE INSTABILITY THROUGH THE EVENING.  SHEAR

WILL BE SUFFICIENT FOR SUPERCELLS...ESPECIALLY WITH INITIAL STORMS

LATE TODAY.  HOWEVER...EVOLUTION INTO CLUSTERS/LINES SHOULD OCCUR

WITH SEVERE THREAT PERSISTING OVER THE HIGH PLAINS INTO THE MID

EVENING.  ALTHOUGH A BRIEF TORNADO MAY OCCUR...OVERALL THREATS

SHOULD BE FROM LARGE HAIL AND DAMAGING WINDS...ALONG WITH HEAVY

RAIN.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 26015.





...EVANS

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