

561 

WWUS20 KWNS 020302

SEL8

SPC WW 020302

IAZ000-NEZ000-SDZ000-020900-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 148

NWS Storm Prediction Center Norman OK

1000 PM CDT Fri Jun 1 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Extreme western Iowa

  Parts of central and eastern Nebraska

  Extreme southeastern South Dakota



* Effective this Friday night and Saturday morning from 1000 PM

  until 400 AM CDT.



* Primary threats include...

  Scattered damaging winds and isolated significant gusts to 75

    mph likely

  Scattered large hail likely with isolated very large hail events

    to 2 inches in diameter possible

  A tornado or two possible



SUMMARY...Thunderstorms have coalesced into a larger convective

system from central into northeastern Nebraska, and these storms

will spread eastward and develop southward well into the overnight

hours.  The storm environment will favor a continuing threat for

large hail with the stronger embedded storms/supercells, while the

threat for damaging winds will increase as the storms become more

linear.  There will also be some threat for a tornado or two with

embedded circulations.



The severe thunderstorm watch area is approximately along and 75

statute miles east and west of a line from 30 miles north northwest

of Sioux City IA to 40 miles south of Hastings NE. 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...This severe thunderstorm watch replaces

tornado watch number 147. Watch number 147 will not be in effect

after 1000 PM CDT.



AVIATION...A few severe thunderstorms with hail surface and aloft to

2 inches. Extreme turbulence and surface wind gusts to 65 knots. A

few cumulonimbi with maximum tops to 600. Mean storm motion vector

29030.



...Thompson

