602
WWUS20 KWNS 170357
SEL7
SPC WW 170357
NDZ000-SDZ000-171200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 597
NWS Storm Prediction Center Norman OK
1100 PM CDT Sat Aug 16 2025

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Southern North Dakota
  Western into Central and Northern South Dakota

* Effective this Saturday night and Sunday morning from 1100 PM
  until 700 AM CDT.

* Primary threats include...
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  Isolated large hail events to 1.5 inches in diameter possible

SUMMARY...Thunderstorms are forecast to continue to develop and
intensify late this evening into the overnight across the Watch
area.  A linear cluster of thunderstorms will likely evolve and move
generally west to east across the Watch tonight.  Scattered severe
gusts (60-75 mph) appear to be the main hazard with the stronger
thunderstorm cores and outflow surges.  Isolated large hail may
accompany the stronger thunderstorms too.

The severe thunderstorm watch area is approximately along and 80
statute miles north and south of a line from 60 miles south
southwest of Buffalo SD to 5 miles southeast of Aberdeen SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).

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 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
25020.

...Smith