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