Storm Prediction Center Mesoscale Discussion 1222

   Mesoscale Discussion 1222
   NWS Storm Prediction Center Norman OK
   1130 PM CDT Sat Jun 20 2026

   Areas affected...portions of the Nebraska Sandhills

   Concerning...Severe Thunderstorm Watch 360...

   Valid 210430Z - 210630Z

   The severe weather threat for Severe Thunderstorm Watch 360
   continues.

   SUMMARY...Thunderstorms continue moving east across portions of
   north-central Nebraska this evening. Modest instability and strong
   shear should maintain the MCS structure, although weak low-level
   lapse rates should keep any severe threat rather isolated.

   DISCUSSION...A north-south linear MCS has organized across portions
   of north-central Nebraska this evening and will continue eastward
   into the morning hours. The overall environment remains
   kinematically favorable for thunderstorm organization (effective
   layer shear greater than 50 knots), although the thermodynamic
   environment remains modest at best with between 500 to 1000 J/kg of
   MUCAPE along the line of storms. Additionally, low-level lapse rates
   continue to weaken, with 0-3 kilometer lapse rates objectively
   analyzed to be around 3 C/km. Thus, despite the linear MCS's
   organization, the elevated nature of the individual thunderstorms
   and the weak low-level lapse rates should limit any severe wind
   potential to being isolated/sporadic in nature.

   ..Marsh.. 06/21/2026

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

   ATTN...WFO...GID...LBF...UNR...

   LAT...LON   43000123 43010026 40710021 40660124 40990127 41260203
               41970138 43000123 

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