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821 

WWUS20 KWNS 122327

SEL1

SPC WW 122327

IAZ000-KSZ000-MOZ000-NEZ000-130700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 71

NWS STORM PREDICTION CENTER NORMAN OK

625 PM CDT SAT APR 12 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHERN IOWA

  CENTRAL AND NORTHEASTERN KANSAS

  NORTHWESTERN MISSOURI

  SOUTHEASTERN NEBRASKA



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 625 PM

  UNTIL 200 AM CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTHEAST OF

HUTCHINSON KANSAS TO 50 MILES EAST NORTHEAST OF SHENANDOAH IOWA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 70...



DISCUSSION...CONVECTION IS DEVELOPING INVOF DRYLINE AND FRONTAL

ZONE...FROM CENTRAL KS NEWD ACROSS MID-MO VALLEY REGION NEAR IA/NEB

BORDER.  ACTIVITY WILL MOVE NEWD TO ENEWD THROUGH ENVIRONMENT OF

STEEP DEEP-LAYER LAPSE RATES AND AT LEAST MRGL DEEP SHEAR FOR

SUPERCELLULAR AND BOWING MODES...OFFERING RISK OF DAMAGING GUSTS AND

LARGE HAIL THIS EVENING.  WIND POTENTIAL WILL BE RELATIVELY

MAXIMIZED WITH ANY UPSCALE GROWTH AND RESULTANT COLD-POOL

ORGANIZATION.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24025.





...EDWARDS

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