Storm Prediction Center Mesoscale Discussion 2159

   Mesoscale Discussion 2159
   NWS Storm Prediction Center Norman OK
   0747 PM CDT Thu Aug 27 2026

   Areas affected...portions of central Nebraska

   Concerning...Severe Thunderstorm Watch 633...

   Valid 280047Z - 280145Z

   The severe weather threat for Severe Thunderstorm Watch 633
   continues.

   SUMMARY...An organizing bowing cluster may produce significant
   severe gusts (75-90 mph) as it moves toward the I-80 corridor over
   the next 1-2 hours.

   DISCUSSION...A cluster of formerly HP supercells over central NE has
   merged and started to organize into a linear complex over the last
   30 min. Recent KLNX radar data shows a developing weak reflectively
   notch concurrent with increasing outbound velocities of 70+ kt at
   1-2 kft AGL. This is suggestive of a rapidly organizing cold pool
   and rear inflow jet. Given the favorable environment with MLCAPE in
   excess of 3000 J/kg and T/TD spreads of 20+ degrees F, significant
   damaging wind potential is likely increasing. Severe gusts of 75-90+
   mph will be possible near the apex of the bowing cluster as it moves
   toward the I-80 corridor over the next hour. If the cluster is able
   to persist, a small downstream watch could be needed south of WW633

   ..Lyons.. 08/28/2026

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

   ATTN...WFO...GID...LBF...GLD...

   LAT...LON   41770147 42080082 41980032 41750020 41200001 40379981
               40049983 39900043 39910084 40030107 40920145 41150142
               41770147 

   MOST PROBABLE PEAK WIND GUST...75-90 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN