

016 

WWUS20 KWNS 021929

SEL7

SPC WW 021929

MTZ000-SDZ000-WYZ000-030300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 477

NWS Storm Prediction Center Norman OK

230 PM CDT Tue Jul 2 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southeast Montana

  Northwest South Dakota

  Northern Wyoming



* Effective this Tuesday afternoon and evening from 230 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered damaging winds and isolated significant gusts to 75

    mph possible

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  A tornado or two possible



SUMMARY...Multiple supercells should develop east-northeast over the

Bighorn Basin and off the Bighorn Mountains. Large hail is the most

likely hazard, but a brief tornado is possible as well.  Severe wind

gusts may become the more predominant hazard as a cluster evolves

into the western Dakotas this evening.



The severe thunderstorm watch area is approximately along and 70

statute miles north and south of a line from 45 miles north

northwest of Worland WY to 60 miles east of Buffalo SD. 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.



&&



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

2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A

few cumulonimbi with maximum tops to 550. Mean storm motion vector

24035.



...Grams

