553
WWUS20 KWNS 132046
SEL8
SPC WW 132046
NEZ000-SDZ000-WYZ000-140400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 588
NWS Storm Prediction Center Norman OK
245 PM MDT Wed Aug 13 2025

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Northern Nebraska
  Western and Central South Dakota
  Northeast Wyoming

* Effective this Wednesday afternoon and evening from 245 PM
  until 1000 PM MDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph possible
  Isolated large hail events to 1.5 inches in diameter possible

SUMMARY...Thunderstorm cluster moving out of northeast WY is
expected to continue southeastward over the next several hours. This
cluster has already produced several gusts around 60 mph. The risk
for strong to severe gusts should continue over the next several
hours as the cluster moves southeastward into the more moist and
unstable airmass downstream across western/central South Dakota and
northern Nebraska.

The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 85 miles west of Rapid
City SD to 55 miles north northeast of Oneill NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU8).

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
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27035.

...Mosier