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WWUS20 KWNS 171915

SEL0

SPC WW 171915

SDZ000-180200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 590

NWS Storm Prediction Center Norman OK

220 PM CDT Sat Aug 17 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  South Dakota



* Effective this Saturday afternoon and evening from 220 PM until

  900 PM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Initial storms over the Black Hills and northeast along a

front in north-central South Dakota will pose a threat for mainly

large hail. With time into the evening, one or more clusters is

anticipated with an increasing risk for severe wind gusts.



The severe thunderstorm watch area is approximately along and 85

statute miles east and west of a line from 65 miles south of Philip

SD to 35 miles north northeast of Aberdeen 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.



&&



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

2 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

26025.



...Grams

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