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WWUS20 KWNS 152236

SEL5

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 215

NWS Storm Prediction Center Norman OK

440 PM MDT Mon May 15 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southeast Montana

  Southwest North Dakota

  Northwest Nebraska

  Western South Dakota

  Eastern Wyoming



* Effective this Monday afternoon from 440 PM until Midnight MDT.



* Primary threats include...

  Isolated very large hail events to 2.5 inches in diameter

    possible

  Isolated damaging wind gusts to 70 mph possible



SUMMARY...Isolated strong to severe thunderstorms including a few

supercells will spread east-northeastward across the region through

the evening. Large hail will be the primary risk, but severe-caliber

wind gusts will also be possible.



The severe thunderstorm watch area is approximately along and 70

statute miles east and west of a line from 5 miles north northwest

of Baker MT to 35 miles east of Torrington WY. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU5).



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 213...WW 214...



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

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

few cumulonimbi with maximum tops to 500. Mean storm motion vector

24020.



...Guyer

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