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URGENT - IMMEDIATE BROADCAST REQUESTED

Tornado Watch Number 571

NWS Storm Prediction Center Norman OK

200 PM MDT Sun Aug 11 2019



The NWS Storm Prediction Center has issued a



* Tornado Watch for portions of

  Southern Montana

  Western South Dakota

  Northeast Wyoming



* Effective this Sunday afternoon and evening from 200 PM until

  900 PM MDT.



* Primary threats include...

  A couple tornadoes possible

  Scattered damaging winds and isolated significant gusts to 80

    mph possible

  Scattered large hail and isolated very large hail events to 3

    inches in diameter possible



SUMMARY...Multiple discrete supercells will progress east-northeast

from northeast Wyoming and south-central Montana. Large hail and a

couple tornadoes should be the primary threat during the first few

hours. Severe wind gust potential will increase later into the

evening as cells likely consolidate into one or more clusters,

especially across southern Montana.



The tornado watch area is approximately along and 85 statute miles

north and south of a line from 20 miles west northwest of Billings

MT to 50 miles northeast of Rapid City SD. For a complete depiction

of the watch see the associated watch outline update (WOUS64 KWNS

WOU1).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A Tornado Watch means conditions are favorable for

tornadoes and 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 569...WW 570...



AVIATION...Tornadoes and a few severe thunderstorms with hail

surface and aloft to 3 inches. Extreme turbulence and surface wind

gusts to 70 knots. A few cumulonimbi with maximum tops to 550. Mean

storm motion vector 24030.



...Grams

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