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WWUS20 KWNS 302218

SEL0

SPC WW 302218

NEZ000-SDZ000-010400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 470

NWS Storm Prediction Center Norman OK

520 PM CDT Sun Jun 30 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  North central Nebraska

  Parts of southern and central South Dakota



* Effective this Sunday afternoon and evening from 520 PM until

  1100 PM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Multiple areas of convection should persist into this

evening, with storms forming along a stalled front from southern

South Dakota into northern Nebraska, and other storms/supercells

likely to spread eastward from southwest South Dakota.  A tornado or

two will remain possible with storms forming along the surface

boundary, while large hail will also be possible.  Some storm

mergers and upscale growth will be possible later this evening, with

an attendant increase in the threat for damaging winds.



The severe thunderstorm watch area is approximately along and 70

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

Valentine NE to 20 miles southeast of Huron 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.



&&



OTHER WATCH INFORMATION...This severe thunderstorm watch replaces

severe thunderstorm watch number 467. Watch number 467 will not

be in effect after 520 PM CDT. CONTINUE...WW 466...WW 468...WW

469...



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 600. Mean storm motion vector

26020.



...Thompson

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