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WWUS20 KWNS 212017

SEL1

SPC WW 212017

IAZ000-MNZ000-NEZ000-SDZ000-220300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 291

NWS Storm Prediction Center Norman OK

320 PM CDT Sun Jun 21 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western Iowa

  Southwest Minnesota

  Central and Eastern Nebraska

  Southeast South Dakota



* Effective this Sunday afternoon and evening from 320 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2.5 inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Initially, isolated severe thunderstorms will continue to

develop across far southeast South Dakota into northwest

Iowa/southwest Minnesota, while additional severe thunderstorms are

expected by late afternoon along a boundary extending across

northern/central Nebraska. A combination of supercells/multicells

are expected, with bouts of large hail/damaging winds as storms

spread generally east-southeastward through early/mid-evening.



The severe thunderstorm watch area is approximately along and 85

statute miles north and south of a line from 45 miles southwest of

Broken Bow NE to 10 miles east southeast of Storm Lake IA. 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 290...



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

2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

29030.



...Guyer

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