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111 

WWUS20 KWNS 082150

SEL7

SPC WW 082150

MTZ000-090500-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 247

NWS Storm Prediction Center Norman OK

355 PM MDT Tue Jun 8 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Eastern Montana



* Effective this Tuesday afternoon and evening from 355 PM until

  1100 PM MDT.



* Primary threats include...

  Scattered damaging winds and isolated significant gusts to 80

    mph likely

  Scattered large hail and isolated very large hail events to 3

    inches in diameter likely

  A tornado or two possible



SUMMARY...Severe thunderstorm development is expected in the next

1-2 hours across eastern Montana, and storms will persist through

late evening while spreading northeastward.  The storm environment

favors a mix of supercells and clusters, with the primary threats of

very large hail (near or larger than the size of baseballs) and

significant damaging winds (up to 80 mph).  An isolated tornado or

two will also be possible with any supercells interacting with the

surface warm front.



The severe thunderstorm watch area is approximately along and 65

statute miles east and west of a line from 60 miles north of Wolf

Point MT to 30 miles south of Broadus 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 246...



AVIATION...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

22025.



...Thompson

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