

661 

WWUS20 KWNS 072028

SEL8

SPC WW 072028

NEZ000-SDZ000-080300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 268

NWS Storm Prediction Center Norman OK

330 PM CDT Sun Jun 7 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  North central Nebraska

  Central South Dakota



* Effective this Sunday afternoon and evening from 330 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered damaging winds and isolated significant gusts to 80

    mph likely

  Scattered large hail and isolated very large hail events to 3

    inches in diameter likely

  A tornado or two possible



SUMMARY...Thunderstorm development is expected in the next 1-2 hours

from northern Nebraska into central South Dakota along a surface

trough.  The storm environment will initially favor supercells

capable of producing very large hail.  Upscale growth into clusters

is likely this evening given storm interactions and strong downdraft

potential, with significant damaging winds possible.  An isolated

tornado cannot be ruled out with the initial storms, but this threat

should be substantially lower than the hail/wind threat.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 35 miles north northwest

of Aberdeen SD to 75 miles southwest of Valentine 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...CONTINUE...WW 266...WW 267...



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

3 inches. Extreme turbulence and surface wind gusts to 70 knots. A

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

23035.



...Thompson

