

069 

WWUS20 KWNS 202059

SEL7

SPC WW 202059

COZ000-NEZ000-WYZ000-210500-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 607

NWS Storm Prediction Center Norman OK

300 PM MDT Tue Aug 20 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Extreme northeast Colorado

  The western Nebraska Panhandle

  Southeast Wyoming



* Effective this Tuesday afternoon and evening from 300 PM until

  1100 PM MDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Scattered thunderstorm development is expected late this

afternoon/evening from extreme northeast Colorado into southeast

Wyoming.  The storm environment will favor discrete supercells with

isolated very large hail initially, and upscale growth into a

cluster is possible late this evening with some damaging wind

potential.



The severe thunderstorm watch area is approximately along and 50

statute miles east and west of a line from 45 miles west northwest

of Chadron NE to 65 miles southeast of Cheyenne WY. 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 604...WW 605...WW 606...



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 550. Mean storm motion vector

29010.



...Thompson

