

540 

WWUS20 KWNS 191521

SEL9

SPC WW 191521

SDZ000-192000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 419

NWS Storm Prediction Center Norman OK

1025 AM CDT Wed Jul 19 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Eastern South Dakota



* Effective this Wednesday morning and afternoon from 1025 AM

  until 300 PM CDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2 inches in diameter possible

  Scattered damaging wind gusts to 70 mph likely



SUMMARY...Line of thunderstorms over central SD is likely to

continue tracking eastward across the watch area, posing a risk of

damaging wind gusts and large hail.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 75 miles west northwest

of Huron SD to 20 miles east northeast of Brookings SD. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU9).



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

29040.



...Hart

