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756 

WWUS20 KWNS 300908

SEL2

SPC WW 300908

IAZ000-NEZ000-SDZ000-301700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 372

NWS STORM PREDICTION CENTER NORMAN OK

405 AM CDT MON JUN 30 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL IOWA

  EASTERN NEBRASKA

  EXTREME SOUTHEASTERN SOUTH DAKOTA



* EFFECTIVE THIS MONDAY MORNING FROM 405 AM UNTIL NOON CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER

    POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH OF

COLUMBUS NEBRASKA TO 35 MILES EAST NORTHEAST OF KNOXVILLE IOWA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 371...



DISCUSSION...MRGL SVR THREAT MAY CONTINUE WITH BOWING CLUSTER OF

TSTMS MOVING SEWD ACROSS N-CENTRAL IA.  ITS OUTFLOW BOUNDARY MAY

FOCUS/DELIMIT SVR POTENTIAL FOR LATER THIS MORNING WITH CLUSTERS OF

TSTMS EVOLVING ACROSS ERN NEB.  NEB ACTIVITY WILL MOVE THROUGH

ENVIRONMENT CHARACTERIZED BY VERY STEEP LAPSE RATES AND RICH

SFC-850-MB MOISTURE SUPPORTING MUCAPE IN 2000-3500 J/KG

RANGE...LIKELY PERSISTING INTO WRN AND PERHAPS CENTRAL IA.  REF SPC

MESOSCALE DISCUSSION 1209 FOR MORE INITIAL DETAILS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27030.





...EDWARDS

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