Storm Prediction Center Mesoscale Discussion 1787

   Mesoscale Discussion 1787
   NWS Storm Prediction Center Norman OK
   0335 PM CDT Tue Jul 28 2026

   Areas affected...Northern Colorado to far southwest Nebraska

   Concerning...Severe Thunderstorm Watch 528...

   Valid 282035Z - 282230Z

   The severe weather threat for Severe Thunderstorm Watch 528
   continues.

   SUMMARY...Large hail remains the primary severe threat across the
   Front Range and into far southwest Nebraska. However, a transition
   to predominantly severe wind is expected through the evening hours.

   DISCUSSION...Latest regional radar imagery and MRMS VII imagery
   continues to show robust updraft development both along the higher
   terrain and along subtle low-level confluence axes. Velocity data
   also depicts rapid outflow development with cells across the High
   Plains with new updraft development noted along outflow collisions.
   New cell development will continue along these boundaries for the
   next hour or two with an attendant threat for large hail. With time,
   continued outflow expansion will promote thunderstorm clustering and
   upscale growth - most likely between the I-70 to I-76 corridors. As
   this occurs, storm motion will become increasingly dominated by cold
   pool propagation, which should support an uptick in severe wind
   potential. Based on output from recent high-res guidance, this
   transition may begin around the 5-7 PM MDT time frame.

   ..Moore.. 07/28/2026

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...LBF...GLD...PUB...BOU...CYS...

   LAT...LON   38710385 38770438 38930498 39260530 39760544 40200533
               40580481 41250349 41560283 41710244 41680220 41550201
               41340200 41080212 40680243 40160278 39800297 39550300
               39170306 38890330 38780352 38710385 

   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN