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WWUS20 KWNS 202234

SEL2

SPC WW 202234

MTZ000-NDZ000-SDZ000-210500-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 412

NWS Storm Prediction Center Norman OK

435 PM MDT Thu Jun 20 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  eastern Montana

  southwestern North Dakota

  northwestern South Dakota



* Effective this Thursday afternoon and evening from 435 PM until

  1100 PM MDT.



* Primary threats include...

  Scattered large hail events to 1.5 inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Strong to severe thunderstorm development is underway and

spreading northeast of the higher terrain.  This activity may

intensify further into early evening, posing a risk for severe hail,

locally strong wind gusts, and perhaps a tornado or two.



The severe thunderstorm watch area is approximately along and 105

statute miles east and west of a line from 30 miles north northwest

of Glendive MT to 45 miles south southwest of Broadus MT. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU2).



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 408...WW 409...WW

410...WW 411...



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

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

few cumulonimbi with maximum tops to 400. Mean storm motion vector

24035.



...Kerr

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