Storm Prediction Center Mesoscale Discussion 2313

   Mesoscale Discussion 2313
   NWS Storm Prediction Center Norman OK
   0729 PM CDT Sat Sep 19 2026

   Areas affected...eastern Colorado into western Kansas

   Concerning...Severe Thunderstorm Watch 671...

   Valid 200029Z - 200230Z

   The severe weather threat for Severe Thunderstorm Watch 671
   continues.

   SUMMARY...Severe threat continues within WW671.

   DISCUSSION...Supercells continue within WW671, producing 1.75-2 inch
   hail across eastern Colorado. Several storm interactions have
   occurred, with a hybrid supercell/multicell cluster and outflow
   boundary moving southeastward. Storms are steadily moving into a
   more favorably sheared and moist/unstable air mass. The threat for
   large hail will continue in the short term, with potential for hail
   up to 2 inches. Observational trends and CAM guidance would suggest
   that storms may eventually cluster along outflow with an increase in
   damaging wind potential into the evening.

   ..Thornton.. 09/20/2026

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

   ATTN...WFO...GLD...PUB...

   LAT...LON   39390205 39290251 39040260 38820262 38740261 38680241
               38550200 38310190 38310156 38470138 38650126 38810123
               39020125 39300156 39390205 

   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN