160
WWUS20 KWNS 131955
SEL2
SPC WW 131955
COZ000-NEZ000-SDZ000-WYZ000-140400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 412
NWS Storm Prediction Center Norman OK
200 PM MDT Fri Jun 13 2025

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Northeast Colorado
  Western Nebraska
  Extreme southwest South Dakota
  Eastern Wyoming

* Effective this Friday afternoon and evening from 200 PM until
  1000 PM MDT.

* Primary threats include...
  Scattered damaging winds likely with isolated significant gusts
    to 75 mph possible
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible

SUMMARY...Thunderstorms are expected to form and spread east of the
higher terrain, with the potential for clustering/upscale growth by
this evening.  Large hail will be possible with the initial, more
cellular storms (especially across northeast Wyoming where a
supercell or two will be possible).  However, severe outflow gusts
of 60-75 mph will become the main threat later this evening as storm
clusters spread east-southeastward over the High Plains.

The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 50 miles north northwest
of Gillette WY to 15 miles southeast of Akron CO. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).

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 411...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
28020.

...Thompson