

816 

WWUS20 KWNS 081921

SEL9

SPC WW 081921

MTZ000-WYZ000-090300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 499

NWS Storm Prediction Center Norman OK

125 PM MDT Mon Jul 8 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern Montana

  Northern Wyoming



* Effective this Monday afternoon and evening from 125 PM until

  900 PM MDT.



* Primary threats include...

  Scattered damaging winds and isolated significant gusts to 80

    mph possible

  Isolated very large hail events to 2 inches in diameter possible

  A tornado or two possible



SUMMARY...Several cells are expected to evolve east-northeast from

northwest Wyoming and south-central Montana. These cells will likely

consolidate into a cluster that accelerates across southeast Montana

and northeast Wyoming this evening. Severe wind and large hail are

the primary hazards.



The severe thunderstorm watch area is approximately along and 100

statute miles north and south of a line from 60 miles northwest of

Cody WY to 55 miles east of Broadus MT. For a complete depiction of

the watch see the associated watch outline update (WOUS64 KWNS

WOU9).



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 498...



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

2 inches. Extreme turbulence and surface wind gusts to 70 knots. A

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

25035.



...Grams

