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WWUS20 KWNS 281937

SEL3

SPC WW 281937

MTZ000-SDZ000-WYZ000-290300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 313

NWS Storm Prediction Center Norman OK

140 PM MDT Sun Jun 28 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Extreme southeastern Montana

  Western South Dakota

  Northeastern Wyoming



* Effective this Sunday afternoon and evening from 140 PM until

  900 PM MDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1.5 inches in diameter possible



SUMMARY...Thunderstorms are expected to increase in

coverage/intensity while spreading northeastward from northeastern

Wyoming this afternoon.  The storms will evolve into a mix of

clusters/line segments with an accompanying threat for damaging

winds and isolated large hail through this evening.



The severe thunderstorm watch area is approximately along and 75

statute miles east and west of a line from 35 miles northwest of

Buffalo SD to 75 miles southeast of Gillette WY. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU3).



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 312...



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 500. Mean storm motion vector

23035.



...Thompson

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