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756 

WWUS20 KWNS 270401

SEL4

SPC WW 270401

IAZ000-NEZ000-271000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 224

NWS STORM PREDICTION CENTER NORMAN OK

1105 PM CDT SUN MAY 26 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EXTREME WEST CENTRAL IOWA

  MUCH OF CENTRAL AND EASTERN NEBRASKA



* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1105 PM

  UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  SEVERAL 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 25 MILES WEST

NORTHWEST OF BURWELL NEBRASKA TO 5 MILES EAST OF OMAHA NEBRASKA.

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.



&&



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 223. WATCH NUMBER 223 WILL NOT BE IN EFFECT

AFTER 1105 PM CDT. CONTINUE...WW 222...



DISCUSSION...EARLIER SUPERCELLS HAVE GROWN UPSCALE INTO AN MCS THAT

APPEARS TO BE DEVELOPING A COLD POOL AND SHOULD BEGIN TO MOVE ESEWD

ALONG THE STALLED FRONTAL ZONE INTO ERN NEB OVERNIGHT.  A CONTINUED

FEED OF MODERATE INSTABILITY FROM THE S ON THE NOSE OF A 45-50 KT

LLJ WILL MAINTAIN A RISK FOR LARGE HAIL AND AT LEAST ISOLATED

DAMAGING GUSTS WITH THE STRONGEST STORMS.



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 29025.





...THOMPSON

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