

526 

WWUS20 KWNS 092004

SEL7

SPC WW 092004

COZ000-KSZ000-NEZ000-100300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 457

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT SAT AUG 9 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  PART OF EASTERN COLORADO

  NORTHWEST AND NORTH CENTRAL KANSAS

  CENTRAL NEBRASKA



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

  1000 PM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

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

MULLEN NEBRASKA TO 25 MILES SOUTHWEST OF HILL CITY KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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.



&&



DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG SEVERAL SURFACE

BOUNDARIES IN AN ENVIRONMENT WITH MLCAPE AOA 2000 J/KG AND MODEST

DEEP-LAYER SHEAR OF 20-30 KT.  THE NET RESULT SHOULD BE ORGANIZED

MULTICELLS CAPABLE OF PRODUCING LARGE HAIL INITIALLY...WHILE THE

DAMAGING WIND RISK WILL INCREASE AS STORMS MERGE AND GROW UPSCALE

INTO ONE OR MORE CLUSTERS.



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 550. MEAN STORM

MOTION VECTOR 32025.





...THOMPSON

