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913 

WWUS20 KWNS 250506

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SPC WW 250506

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 216

NWS STORM PREDICTION CENTER NORMAN OK

1205 AM CDT SAT MAY 25 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH-CENTRAL AND EASTERN NEBRASKA



* EFFECTIVE THIS SATURDAY MORNING FROM 1205 AM UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

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

SOUTHWEST OF BROKEN BOW NEBRASKA TO 45 MILES SOUTH SOUTHEAST OF

COLUMBUS NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...A COMPOSITE MCS...INCLUDING A FEW EMBEDDED SUPERCELL

STRUCTURES AND SMALL BOWS...IS EXPECTED TO CONTINUE A PERSISTENT

EASTWARD MOVING ACROSS SOUTH-CENTRAL AND EAST-CENTRAL NEB OVERNIGHT.

THIS MCS IS BEING AIDED BY A STRONG /50 KT/ SOUTHERLY LOW LEVEL JET

AS PER WSR-88D VWP DATA FROM HASTINGS/BLUE HILL NEB. BOUTS OF SEVERE

HAIL AND DAMAGING WINDS WILL BE THE PRIMARY HAZARDS ASIDE FROM

LOCALLY HEAVY RAINFALL...ALTHOUGH INCREASING CINH SHOULD EVENTUALLY

LEAD TO A WANING INTENSITY TREND.



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 500. MEAN STORM

MOTION VECTOR 26025.





...GUYER

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