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WWUS20 KWNS 110257

SEL0

SPC WW 110257

SDZ000-WYZ000-111000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 310

NWS Storm Prediction Center Norman OK

900 PM MDT Sat Jun 10 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western and central South Dakota

  Northeastern Wyoming



* Effective this Saturday night and Sunday morning from 900 PM

  until 400 AM MDT.



* Primary threats include...

  Scattered damaging winds and isolated significant gusts to 75

    mph possible

  Isolated large hail events to 1.5 inches in diameter possible



SUMMARY...Thunderstorms should continue to develop and gradually

increase in both coverage and intensity over the Black Hills region,

strengthening to severe levels over the next few hours.  A mix of

damaging wind and large hail is expected in the early stages.

Activity then should shift into central South Dakota, assuming more

of an organized wind threat with time late tonight.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 65 miles west of Rapid

City SD to 80 miles east northeast 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.



&&



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

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

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

26035.



...Edwards

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