

155 

WWUS20 KWNS 190033

SEL9

SPC WW 190033

COZ000-NEZ000-WYZ000-190600-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 189

NWS Storm Prediction Center Norman OK

635 PM MDT Mon Jun 18 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northeast Colorado

  Western Nebraska Panhandle

  Far Southeast Wyoming



* Effective this Monday night from 635 PM until Midnight MDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Isolated strong to severe thunderstorms will continue to

develop this evening from the northern Colorado Front Range vicinity

east/northeastward into the adjacent High Plains of northeast

Colorado and possibly southeast Wyoming and the western Nebraska

Panhandle. An evolving upslope flow regime and ample deep-layer

shear will support supercells capable of mainly large hail, although

a tornado could occur.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 50 miles northwest of

Sidney NE to 50 miles east southeast of Denver CO. 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 188...



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

24025.



...Guyer

