Storm Prediction Center Mesoscale Discussion 888

   Mesoscale Discussion 0888
   NWS Storm Prediction Center Norman OK
   0742 PM CDT Thu May 28 2026

   Areas affected...central and eastern Washington into the Idaho
   Panhandle and northwest Montana

   Concerning...Severe Thunderstorm Watch 249...

   Valid 290042Z - 290145Z

   The severe weather threat for Severe Thunderstorm Watch 249
   continues.

   SUMMARY...The threat for large hail up to golf-ball size and locally
   severe wind gusts continues across the watch area. The potential for
   a more widespread damaging-wind event may evolve in the 02-04z time
   frame across parts of eastern WA and the northern ID Panhandle,
   possibly into far northwest MT, with gusts up to 70-75 mph.

   DISCUSSION...Recent visible satellite and radar data indicate robust
   thunderstorms ongoing across the central ID Panhandle, along and to
   the north of a surface boundary where steep lapse rates and
   dewpoints in the 50s to around 60 are yielding MLCAPE of 1500-2500+
   J/kg. The instability coincides with steadily strengthening
   mid/upper-level winds and resultant vertical shear, with the
   parameter space supportive of supercell structures capable of large
   hail.

   Latest model guidance suggests that growing cold pools associated
   with the ID convection, and additional strong to severe storms
   ongoing across parts of northeast OR may consolidate, leading to a
   northward-accelerating thunderstorm line in the 02-04z time frame.
   The downstream air mass across central and eastern WA has become
   quite hot, with a deeply mixed boundary layer and DCAPE values of
   1000-1500+ J/kg. Should the scenario unfold as the model guidance
   suggests, the ambient thermodynamic environment will favor strong to
   intense convective downdrafts capable of wind gusts up to 70-75 mph.

   ..Mead.. 05/29/2026

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

   ATTN...WFO...TFX...MSO...BOI...OTX...PDT...SEW...

   LAT...LON   46001825 45682083 45722150 47192131 48972079 48991398
               48001296 47361305 46821264 46491225 46101302 45481415
               45221469 45221584 45141626 45301662 45851659 46011690
               46001825 

   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN