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WWUS20 KWNS 111807

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IAZ000-MNZ000-120100-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 356

NWS Storm Prediction Center Norman OK

110 PM CDT Sat Jul 11 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern and East-Central Iowa

  Southern Minnesota



* Effective this Saturday afternoon and evening from 110 PM until

  800 PM CDT.



* Primary threats include...

  Scattered damaging winds likely with isolated significant gusts

    to 75 mph possible

  Scattered large hail likely with isolated very large hail events

    to 2.5 inches in diameter possible



SUMMARY...Thunderstorms will continue to intensify and organize

initially across southern Minnesota and into northern Iowa. Some

initial supercells are expected, with large and damaging winds

expected. Storms may gradually merge into southeastward-moving

clusters with a broader damaging wind potential evolving later this

afternoon.



The severe thunderstorm watch area is approximately along and 100

statute miles north and south of a line from 30 miles south

southwest of Redwood Falls MN to 15 miles north northeast of

Waterloo IA. For a complete depiction of the watch see the

associated watch outline update (WOUS64 KWNS WOU6).



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

2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A

few cumulonimbi with maximum tops to 550. Mean storm motion vector

31030.



...Guyer

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