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498 

WWUS20 KWNS 261905

SEL4

SPC WW 261905

COZ000-KSZ000-NEZ000-270000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 454

NWS STORM PREDICTION CENTER NORMAN OK

105 PM MDT SUN JUL 26 2015



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHEAST COLORADO

  NORTHWEST KANSAS

  WESTERN NEBRASKA



* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 105 PM UNTIL

  600 PM MDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER

    POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



SUMMARY...ROBUST THUNDERSTORM DEVELOPMENT EXPECTED TO CONTINUE ALONG

LEE/THERMAL TROUGH AXIS THROUGH THE AFTERNOON. DEVELOPMENT MAY BE

AIDED BY WEAK SHORTWAVE TROUGH APPROACHING FROM NWRN CO. POCKETS OF

STRONGER EFFECTIVE SHEAR AROUND 30KT SHOULD PROMOTE UPDRAFT

PERSISTENCE AND INTENSITY WITH A COUPLE OF LARGE HAIL AND POSSIBLY

DAMAGING WIND EVENTS POSSIBLE. STORMS MAY EVENTUALLY MERGE INTO ONE

OR TWO LARGE CLUSTERS WITH WIND POTENTIAL INCREASING AS THESE

MOVE/DEVELOP EAST THROUGH LATE AFTERNOON.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST

NORTHEAST OF CHADRON NEBRASKA TO 45 MILES SOUTH OF LIMON

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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.



&&



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 500. MEAN STORM

MOTION VECTOR 26020.





...CARBIN

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