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528 

WWUS20 KWNS 040216

SEL8

SPC WW 040216

IAZ000-MOZ000-NEZ000-041000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 538

NWS STORM PREDICTION CENTER NORMAN OK

915 PM CDT THU OCT 3 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  SOUTHWEST IOWA

  FAR NORTHWEST MISSOURI

  SOUTHEAST NEBRASKA



* EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 915 PM

  UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES WITH A FEW INTENSE TORNADOES POSSIBLE

  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHWEST OF OMAHA

NEBRASKA TO 25 MILES WEST SOUTHWEST OF BEATRICE NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 537...



DISCUSSION...SUSTAINED SUPERCELLS APPEAR TO HAVE EVOLVED IN SW PART

OF WW 537...WHERE WINDOW OF OPPORTUNITY WILL EXIST FOR A COUPLE

TORNADOES GIVEN /1/ NEAR-SURFACE-BASED INFLOW LAYER FOR STORMS.../2/

RICH LOW-LVL MOISTURE...AND /3/ BACKED NEAR-SFC FLOW INVOF

DISSIPATING WNW-ESE OUTFLOW BOUNDARY IN SE NEB/NW MO. FURTHER

DETAILS ON MESOSCALE ENVIRONMENT ARE GIVEN IN DISCUSSION FOR WW

537...AND IN 01Z CONVECTIVE OTLK...AND MCD 1924.



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 24030.





...CORFIDI

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