411
WWUS20 KWNS 131900
SEL1
SPC WW 131900
MTZ000-WYZ000-140300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 411
NWS Storm Prediction Center Norman OK
100 PM MDT Fri Jun 13 2025

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Central and southeast Montana
  North central Wyoming

* Effective this Friday afternoon and evening from 100 PM until
  900 PM MDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter likely
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  A tornado or two possible

SUMMARY...Supercell development is expected this afternoon into
central Montana and storms will spread eastward through late
evening.  Large hail up to 2.5 inches in diameter will be a primary
threat, along with thunderstorm outflow gusts of 60-75 mph.  There
is also a low threat for an isolated tornado or two.

The severe thunderstorm watch area is approximately along and 115
statute miles east and west of a line from 70 miles north of
Lewistown MT to 60 miles south southeast of Billings MT. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU1).

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 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27025.

...Thompson