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WWUS20 KWNS 101932

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IDZ000-MTZ000-110300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 567

NWS Storm Prediction Center Norman OK

135 PM MDT Sat Aug 10 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Idaho

  Western Montana



* Effective this Saturday afternoon and evening from 135 PM until

  900 PM MDT.



* 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



SUMMARY...Scattered thunderstorms will develop from the Oregon-Idaho

border region across southwest Montana. Some of these should become

strong to severe, producing large hail and damaging winds.



The severe thunderstorm watch area is approximately along and 115

statute miles north and south of a line from 35 miles west northwest

of Boise ID to 60 miles southeast of Helena MT. 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.



&&



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 500. Mean storm motion vector

21030.



...Grams

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