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WWUS20 KWNS 171850

SEL1

SPC WW 171850

COZ000-NEZ000-WYZ000-180200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 171

NWS Storm Prediction Center Norman OK

1255 PM MDT Fri May 17 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northeast Colorado

  Southern Nebraska Panhandle

  Southeast Wyoming



* Effective this Friday afternoon and evening from 1255 PM until

  800 PM MDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter likely

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Thunderstorms are expected to intensify over northeast

Colorado and southeast Wyoming this afternoon, tracking across the

watch area.  The strongest cells will likely pose a risk of large

hail and perhaps damaging wind gusts.  A tornado cannot be ruled

out.



The severe thunderstorm watch area is approximately along and 75

statute miles north and south of a line from 10 miles west southwest

of Cheyenne WY to 20 miles east of Sidney NE. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU1).



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

22035.



...Hart

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