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WWUS20 KWNS 090230

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 355

NWS Storm Prediction Center Norman OK

930 PM CDT Thu Jul 8 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Central and southeastern South Dakota



* Effective this Thursday night and Friday morning from 930 PM

  until 300 AM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible



SUMMARY...Supercells in northwestern South Dakota and southwestern

North Dakota could move into the western parts of the watch area in

central South Dakota before those storms weaken.  Additional

elevated thunderstorms will likely form farther southeast into

southeastern South Dakota through the early overnight hours.  The

strongest storms to the west will be capable of producing large hail

and damaging winds, while the elevated storms to the east will

primarily pose a threat for large hail.



The severe thunderstorm watch area is approximately along and 35

statute miles north and south of a line from 80 miles west northwest

of Pierre SD to 25 miles south southeast of Sioux Falls SD. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU5).



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 350...WW 353...WW 354...



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 550. Mean storm motion vector

31025.



...Thompson

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