

741 

WWUS20 KWNS 202020

SEL5

SPC WW 202020

COZ000-NEZ000-SDZ000-WYZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 195

NWS Storm Prediction Center Norman OK

220 PM MDT Wed May 20 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northeast Colorado

  Nebraska Panhandle

  Western South Dakota

  Eastern Wyoming



* Effective this Wednesday afternoon and evening from 220 PM

  until 1000 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

  A tornado or two possible



SUMMARY...Storms will continue to develop and intensify this

afternoon initially across eastern Wyoming. Initial supercells are

expected with large hail a distinct possibility. Over time, storms

will develop/spread toward western portions of South Dakota and

Nebraska, and also develop southward into northern Colorado by

evening. The damaging wind threat will also increase by early

evening and a tornado cannot be ruled out, particularly along the

Wyoming/South Dakota/Nebraska border vicinity.



The severe thunderstorm watch area is approximately along and 65

statute miles east and west of a line from 70 miles northeast of

Gillette WY to 65 miles southwest of Sidney NE. 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.



&&



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

19020.



...Guyer

