Storm Prediction Center Mesoscale Discussion 2106

   Mesoscale Discussion 2106
   NWS Storm Prediction Center Norman OK
   0556 PM CDT Sun Aug 23 2026

   Areas affected...northern utah...southeast Idaho and far southwest
   Wyoming

   Concerning...Severe Thunderstorm Watch 619...

   Valid 232256Z - 240030Z

   The severe weather threat for Severe Thunderstorm Watch 619
   continues.

   SUMMARY...Severe wind gusts and hail remain possible with strong to
   severe storms across UT/ID and far western WY this evening.

   DISCUSSION...Across WW 619, a band of strong to severe storms have
   matured across eastern ID with more isolated strong storms ongoing
   over northwest UT late this afternoon. A modestly moist, hot and
   moderately unstable air mas remains in place ahead of these storms
   which should continue to support them over the next several hours.
   Steep low-level lapse rates will primarily favor severe wind gusts,
   but enhanced mid-level flow at the base of the northern Rockies
   upper trough is supporting some cellular structures. Hail is
   possible, especially with any persistent supercells.

   Expectations are for convection to gradually spread northeastward
   across UT and far southwestern WY into this evening. Some clustering
   is possible, based on recent CAM solutions. This appears most likely
   over northern UT into southwest WY. This could support a localized
   corridor of more concentrated severe wind gusts later this evening.
   Given the ongoing storms and a generally favorable environment, the
   severe risk continues for much of WW619.

   ..Lyons.. 08/23/2026

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

   ATTN...WFO...RIW...SLC...PIH...LKN...

   LAT...LON   40841426 42451323 42961137 42831076 42161028 41791002
               41361001 40651007 40011066 39891240 39851330 39921368
               40001404 40841426 

   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN