Storm Prediction Center Severe Thunderstorm Watch 428

Note: 
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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   SEL8

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 428
   NWS Storm Prediction Center Norman OK
   1050 AM MDT Tue Jun 17 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Eastern Colorado
     Nebraska Panhandle
     Southeast Wyoming

   * Effective this Tuesday morning and afternoon from 1050 AM until
     500 PM MDT.

   * Primary threats include...
     Scattered large hail likely with isolated very large hail events
       to 3 inches in diameter possible
     Scattered damaging wind gusts to 70 mph possible
     A tornado or two possible

   SUMMARY...Thunderstorms are expected to rapidly develop over the
   foothills and mountains of central Colorado and southern Wyoming. 
   These storms will track slowly eastward through the afternoon,
   posing a risk of large hail and perhaps a tornado or two.

   The severe thunderstorm watch area is approximately along and 55
   statute miles east and west of a line from 40 miles east northeast
   of Douglas WY to 30 miles south southeast of Trinidad CO. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU8).

   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
   3 inches. Extreme turbulence and surface wind gusts to 60 knots. A
   few cumulonimbi with maximum tops to 500. Mean storm motion vector
   27030.

   ...Hart

   SEL8

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 428
   NWS Storm Prediction Center Norman OK
   1050 AM MDT Tue Jun 17 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Eastern Colorado
     Nebraska Panhandle
     Southeast Wyoming

   * Effective this Tuesday morning and afternoon from 1050 AM until
     500 PM MDT.

   * Primary threats include...
     Scattered large hail likely with isolated very large hail events
       to 3 inches in diameter possible
     Scattered damaging wind gusts to 70 mph possible
     A tornado or two possible

   SUMMARY...Thunderstorms are expected to rapidly develop over the
   foothills and mountains of central Colorado and southern Wyoming. 
   These storms will track slowly eastward through the afternoon,
   posing a risk of large hail and perhaps a tornado or two.

   The severe thunderstorm watch area is approximately along and 55
   statute miles east and west of a line from 40 miles east northeast
   of Douglas WY to 30 miles south southeast of Trinidad CO. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU8).

   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
   3 inches. Extreme turbulence and surface wind gusts to 60 knots. A
   few cumulonimbi with maximum tops to 500. Mean storm motion vector
   27030.

   ...Hart

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

   SAW8 
   WW 428 SEVERE TSTM CO NE WY 171650Z - 172300Z
   AXIS..55 STATUTE MILES EAST AND WEST OF LINE..
   40ENE DGW/DOUGLAS WY/ - 30SSE TAD/TRINIDAD CO/
   ..AVIATION COORDS.. 50NM E/W /72E DDY - 35SW TBE/
   HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..60 KNOTS.
   MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27030.

   LAT...LON 42960355 36860313 36860512 42960573

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU8.

Watch 428 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.