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WWUS20 KWNS 260030

SEL0

SPC WW 260030

SDZ000-WYZ000-260700-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 620

NWS Storm Prediction Center Norman OK

630 PM MDT Sun Aug 25 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western and south-central South Dakota

  Northeast Wyoming



* Effective this Sunday night and Monday morning from 630 PM

  until 100 AM MDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Isolated significant damaging wind gusts to 75 mph possible



SUMMARY...Severe storms will likely continue to increase in

coverage/intensity across northeast Wyoming this evening, and then

spread into southwest/south-central South Dakota later this evening.

Damaging winds and large hail will be possible.



The severe thunderstorm watch area is approximately along and 60

statute miles north and south of a line from 100 miles west of Rapid

City SD to 40 miles south southeast of Pierre SD. 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 619...



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 500. Mean storm motion vector

31025.



...Guyer

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