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WWUS20 KWNS 280318

SEL1

SPC WW 280318

NDZ000-SDZ000-281000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 461

NWS Storm Prediction Center Norman OK

1020 PM CDT Thu Aug 27 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern North Dakota

  Central and Eastern South Dakota



* Effective this Thursday night and Friday morning from 1020 PM

  until 500 AM CDT.



* Primary threats include...

  Scattered damaging winds likely with isolated significant gusts

    to 80 mph possible

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  A tornado or two possible



SUMMARY...Storms over western South Dakota at mid/late evening are

expected to organize and accelerate eastward through the late

evening and overnight hours with an increasing risk for wind damage

and wind-driven hail across central into eastern South Dakota, and

possibly southern North Dakota.



The severe thunderstorm watch area is approximately along and 105

statute miles north and south of a line from 20 miles north of

Pierre SD to 30 miles north northeast of Brookings SD. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU1).



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 460...



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

2 inches. Extreme turbulence and surface wind gusts to 70 knots. A

few cumulonimbi with maximum tops to 550. Mean storm motion vector

28040.



...Guyer

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