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293 

WWUS20 KWNS 220315

SEL2

SPC WW 220315

NEZ000-220900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 342

NWS STORM PREDICTION CENTER NORMAN OK

1015 PM CDT FRI JUN 21 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL NEBRASKA



* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1015 PM

  UNTIL 400 AM CDT.



* PRIMARY THREATS INCLUDE...

  A FEW VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST

OF BROKEN BOW NEBRASKA TO 70 MILES NORTHEAST OF GRAND ISLAND

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 338...WW 339...WW

340...WW 341...



DISCUSSION...A SMALL WATCH TO ACCOUNT FOR THE DEVELOPMENT OF SOME

FORWARD PROPAGATION ON THE TRAILING PORTION OF THE LINEAR MCS

SPREADING EAST FROM SWRN NEB THIS EVENING. COLD POOL DYNAMICS APPEAR

SUFFICIENT TO OVERCOME WARMER TEMPERATURES ALOFT WITH AN INCREASING

CHANCE THAT CONVECTION WILL BE ACCOMPANIED BY DAMAGING WINDS AND

PERHAPS SOME HAIL AS IT DEVELOPS EWD FROM CUSTER AND DAWSON COUNTIES

IN THE NEXT 1-2 HOURS.



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 550. MEAN STORM

MOTION VECTOR 25035.





...CARBIN

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