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166 

WWUS20 KWNS 100039

SEL0

SPC WW 100039

MTZ000-100600-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 250

NWS Storm Prediction Center Norman OK

640 PM MDT Wed Jun 9 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  central Montana



* Effective this Wednesday night from 640 PM until Midnight MDT.



* Primary threats include...

  Isolated very large hail events to 2 inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Isolated storms including supercells will pose a risk for

mainly large to very large hail and downburst winds this evening. A

brief tornado or two also cannot be ruled out.



The severe thunderstorm watch area is approximately along and 75

statute miles east and west of a line from 50 miles northeast of

Havre MT to 20 miles southwest of Lewistown MT. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU0).



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

24035.



...Dial

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