Storm Prediction Center Severe Thunderstorm Watch 412

Note: 
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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   SEL2

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 412
   NWS Storm Prediction Center Norman OK
   200 PM MDT Fri Jun 13 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northeast Colorado
     Western Nebraska
     Extreme southwest South Dakota
     Eastern Wyoming

   * Effective this Friday afternoon and evening from 200 PM until
     1000 PM MDT.

   * Primary threats include...
     Scattered damaging winds likely with isolated significant gusts
       to 75 mph possible
     Scattered large hail and isolated very large hail events to 2
       inches in diameter possible

   SUMMARY...Thunderstorms are expected to form and spread east of the
   higher terrain, with the potential for clustering/upscale growth by
   this evening.  Large hail will be possible with the initial, more
   cellular storms (especially across northeast Wyoming where a
   supercell or two will be possible).  However, severe outflow gusts
   of 60-75 mph will become the main threat later this evening as storm
   clusters spread east-southeastward over the High Plains.

   The severe thunderstorm watch area is approximately along and 60
   statute miles east and west of a line from 50 miles north northwest
   of Gillette WY to 15 miles southeast of Akron CO. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU2).

   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.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 411...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
   few cumulonimbi with maximum tops to 500. Mean storm motion vector
   28020.

   ...Thompson

   SEL2

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 412
   NWS Storm Prediction Center Norman OK
   200 PM MDT Fri Jun 13 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northeast Colorado
     Western Nebraska
     Extreme southwest South Dakota
     Eastern Wyoming

   * Effective this Friday afternoon and evening from 200 PM until
     1000 PM MDT.

   * Primary threats include...
     Scattered damaging winds likely with isolated significant gusts
       to 75 mph possible
     Scattered large hail and isolated very large hail events to 2
       inches in diameter possible

   SUMMARY...Thunderstorms are expected to form and spread east of the
   higher terrain, with the potential for clustering/upscale growth by
   this evening.  Large hail will be possible with the initial, more
   cellular storms (especially across northeast Wyoming where a
   supercell or two will be possible).  However, severe outflow gusts
   of 60-75 mph will become the main threat later this evening as storm
   clusters spread east-southeastward over the High Plains.

   The severe thunderstorm watch area is approximately along and 60
   statute miles east and west of a line from 50 miles north northwest
   of Gillette WY to 15 miles southeast of Akron CO. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU2).

   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.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 411...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
   few cumulonimbi with maximum tops to 500. Mean storm motion vector
   28020.

   ...Thompson

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

   SAW2 
   WW 412 SEVERE TSTM CO NE SD WY 132000Z - 140400Z
   AXIS..60 STATUTE MILES EAST AND WEST OF LINE..
   50NNW GCC/GILLETTE WY/ - 15SE AKO/AKRON CO/
   ..AVIATION COORDS.. 50NM E/W /50ENE SHR - 11SE AKO/
   HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..65 KNOTS.
   MAX TOPS TO 500. MEAN STORM MOTION VECTOR 28020.

   LAT...LON 45010469 40020189 40020415 45010715

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU2.

Watch 412 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.