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546 

WWUS20 KWNS 080115

SEL8

SPC WW 080115

IAZ000-NEZ000-080600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 128

NWS STORM PREDICTION CENTER NORMAN OK

815 PM CDT WED MAY 7 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EXTREME SOUTHWEST IOWA

  SOUTHEAST NEBRASKA



* EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 815 PM

  UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF

BEATRICE NEBRASKA TO 40 MILES NORTH NORTHEAST OF SHENANDOAH IOWA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 122...WW 123...WW

124...WW 125...WW 126...WW 127...



DISCUSSION...RAPID THUNDERSTORM DEVELOPMENT HAS OCCURRED ALONG THE

NW EDGE OF THE RETURNING MOISTURE...AND STORMS WILL LIKELY PERSIST

FOR A FEW HOURS IN RESPONSE TO SEVERAL BOUNDARY MERGERS IN THE NEXT

HOUR OR SO.  GIVEN STEEP LAPSE RATES/MODERATE INSTABILITY AND

EFFECTIVE BULK SHEAR OF 35-45 KT...THERE WILL BE A RISK FOR

SUPERCELLS/CLUSTERS WITH LARGE HAIL AND DAMAGING WINDS.



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 24025.





...THOMPSON

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