849
WWUS20 KWNS 212131
SEL5
SPC WW 212131
MTZ000-NDZ000-SDZ000-WYZ000-220500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 535
NWS Storm Prediction Center Norman OK
335 PM MDT Mon Jul 21 2025

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Southeast Montana
  Southwest North Dakota
  Northwest South Dakota
  Northeast Wyoming

* Effective this Monday afternoon and evening from 335 PM until
  1100 PM MDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Thunderstorms will continue to develop and intensify
across parts of northeast Wyoming and southeast Montana through the
late afternoon.  These storms will track northeastward across the
watch area, posing a risk of large hail and damaging wind gusts.

The severe thunderstorm watch area is approximately along and 75
statute miles north and south of a line from 60 miles northwest of
Billings MT to 25 miles east northeast of Buffalo SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).

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
25030.

...Hart