

832 

WWUS20 KWNS 142126

SEL0

SPC WW 142126

COZ000-KSZ000-NEZ000-SDZ000-150500-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 440

NWS Storm Prediction Center Norman OK

325 PM MDT Sat Aug 14 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  northeastern Colorado

  northwestern Kansas

  western Nebraska including the Panhandle

  southwestern South Dakota



* Effective this Saturday afternoon and evening from 325 PM until

  1100 PM MDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Thunderstorms are currently increasing in coverage near

the Black Hills of southwestern South Dakota, and should continue to

expand/spread south-southeastward with time over the next several

hours.  Very large hail will likely remain the primary severe risk

initially, with damaging winds an increasing likelihood with time,

as storms grow upscale linearly into the evening.



The severe thunderstorm watch area is approximately along and 65

statute miles east and west of a line from 35 miles northeast of

Rapid City SD to 60 miles south of Imperial NE. 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 500. Mean storm motion vector

33025.



...Goss

