

657 

WWUS20 KWNS 061132

SEL3

SPC WW 061132

IAZ000-NEZ000-061700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 473

NWS STORM PREDICTION CENTER NORMAN OK

625 AM CDT TUE AUG 6 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WEST CENTRAL AND SOUTHWEST IOWA

  EAST CENTRAL NEBRASKA



* EFFECTIVE THIS TUESDAY MORNING FROM 625 AM UNTIL NOON CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 35

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST OF

NORFOLK NEBRASKA TO 40 MILES EAST OF OMAHA NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



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 472...



DISCUSSION...STORMS WITHIN SMALL CONVECTIVE SYSTEM THAT TRACKED ESE

FROM SRN SD EARLIER THIS MORNING HAVE INCREASED IN THE PAST HOUR.

THEY MAY POSE A CONTINUED RISK FOR SVR WIND/HAIL AS THE ACTIVITY

CONTINUES ESE IN TANDEM WITH ENTRANCE REGION OF NRN IA HIGH-LVL JET

STREAK.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 30030.





...CORFIDI

