Storm Prediction Center Severe Thunderstorm Watch 411

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   SEL1

   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

   SEL1

   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

Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.

   SAW1 
   WW 411 SEVERE TSTM MT WY 131900Z - 140300Z
   AXIS..115 STATUTE MILES EAST AND WEST OF LINE..
   70N LWT/LEWISTOWN MT/ - 60SSE BIL/BILLINGS MT/
   ..AVIATION COORDS.. 100NM E/W /31SSE HVR - 44WNW SHR/
   HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..65 KNOTS.
   MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27025.

   LAT...LON 48040698 44970571 44971041 48041196

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU1.

Watch 411 Status Report Message has not been issued yet.

Note:
 Click for Complete Product Text.

Tornadoes

Wind

Hail

Combined Severe Hail/Wind

For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The “Low” category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
“Moderate” from 30% to 60%, and “High” from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.