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WWUS20 KWNS 101103

SEL4

SPC WW 101103

IAZ000-NEZ000-SDZ000-101600-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 424

NWS Storm Prediction Center Norman OK

605 AM CDT Mon Aug 10 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northwest Iowa

  Northeast Nebraska

  Southeast South Dakota



* Effective this Monday morning from 605 AM until 1100 AM CDT.



* Primary threats include...

  Scattered damaging winds likely with isolated significant gusts

    to 75 mph possible

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible



SUMMARY...A cluster of thunderstorms along the South Dakota/Nebraska

border is expected to intensify this morning and track across the

watch area.  Damaging winds are the primary threat, along with some

hail potential.



The severe thunderstorm watch area is approximately along and 40

statute miles north and south of a line from 40 miles west of

Yankton SD to 15 miles north northeast of Storm Lake IA. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU4).



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 65 knots. A

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

28035.



...Hart

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