

755 

WWUS20 KWNS 281309

SEL0

SPC WW 281309

IAZ000-NEZ000-282000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 230

NWS Storm Prediction Center Norman OK

810 AM CDT Thu Jun 28 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western and southern Iowa

  Eastern Nebraska



* Effective this Thursday morning and afternoon from 810 AM until

  300 PM CDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2.5 inches in diameter possible

  Scattered damaging wind gusts to 70 mph likely



SUMMARY...A cluster of storms across eastern Nebraska should persist

east/southeastward within additional storm development and

intensification within an increasingly unstable boundary layer along

a frontal boundary. Large hail and damaging winds can be expected.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 25 miles north of

Columbus NE to 15 miles south of Des Moines IA. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU0).



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.



&&



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 600. Mean storm motion vector

29030.



...Guyer

