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WWUS20 KWNS 271801

SEL3

SPC WW 271801

NEZ000-WYZ000-280200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 123

NWS Storm Prediction Center Norman OK

1205 PM MDT Sun May 27 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Western Nebraska

  Southern and Central Wyoming



* Effective this Sunday afternoon and evening from 1205 PM until

  800 PM MDT.



* Primary threats include...

  Scattered large hail likely with isolated very large hail events

    to 2 inches in diameter possible

  Scattered damaging wind gusts to 70 mph likely

  A tornado or two possible



SUMMARY...Thunderstorms are expected to develop across southern

Wyoming and spread northward across the watch area this afternoon.

The strongest cells will be capable of large hail and damaging wind

gusts.  Any isolated and persistent storm could also pose a risk of

a tornado.



The severe thunderstorm watch area is approximately along and 75

statute miles north and south of a line from 50 miles northwest of

Rawlins WY to 10 miles southeast of Alliance NE. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU3).



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

few cumulonimbi with maximum tops to 450. Mean storm motion vector

20030.



...Hart

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