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WWUS20 KWNS 070117

SEL7

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NEZ000-SDZ000-070800-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 557

NWS Storm Prediction Center Norman OK

820 PM CDT Tue Aug 6 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Parts of north central and central Nebraska

  Parts of south central and southeast South Dakota



* Effective this Tuesday night and Wednesday morning from 820 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...Clusters of severe storms, including some supercells, will

continue to spread south-southeastward from South Dakota into

Nebraska overnight, with additional storm development also possible.

 The storm environment will favor large hail and damaging gusts as

the primary severe threats through the early morning hours.



The severe thunderstorm watch area is approximately along and 55

statute miles east and west of a line from 45 miles north of

Chamberlain SD to 55 miles south southeast of Burwell NE. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU7).



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 555...WW 556...



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

32030.



...Thompson

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