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WWUS20 KWNS 011826

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SPC WW 011826

NEZ000-SDZ000-020300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 454

NWS STORM PREDICTION CENTER NORMAN OK

125 PM CDT THU AUG 1 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  NORTHERN AND CENTRAL NEBRASKA

  SOUTH-CENTRAL SOUTH DAKOTA



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 125 PM UNTIL

  1000 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER LIKELY

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHWEST OF

VALENTINE NEBRASKA TO 5 MILES EAST SOUTHEAST OF KEARNEY NEBRASKA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



DISCUSSION...RAPID TSTM DEVELOPMENT IS UNDERWAY ACROSS S-CNTRL SD

WITH ADDITIONAL STORM FORMATION ANTICIPATED THIS AFTERNOON FARTHER

TO THE SOUTH IN NEBRASKA.  THE AMBIENT ENVIRONMENT IS CHARACTERIZED

BY MODERATE TO STRONG INSTABILITY /MLCAPE OF 2000-3000+ J PER KG/

AND RATHER STRONG DEEP-LAYER SHEAR.  AS SUCH...THE SETUP IS VERY

FAVORABLE FOR SUPERCELLS CAPABLE OF VERY LARGE HAIL AND A FEW

TORNADOES.  UPSCALE GROWTH OF STORMS INTO A SEWD-MOVING BOW/MCS IS

EXPECTED TO OCCUR WITH AN ASSOCIATED WIND AND HAIL THREAT CONTINUING

THROUGH THIS EVENING.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 32020.





...MEAD

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