Storm Prediction Center Mesoscale Discussion 1693

   Mesoscale Discussion 1693
   NWS Storm Prediction Center Norman OK
   0208 PM CDT Tue Jul 21 2026

   Areas affected...portions of the middle and upper Ohio Valley

   Concerning...Severe Thunderstorm Watch 506...508...

   Valid 211908Z - 212045Z

   The severe weather threat for Severe Thunderstorm Watch 506, 508
   continues.

   SUMMARY...Threat for all severe hazards continues across portions of
   the middle and upper Ohio Valley. A gradual transition towards
   damaging/severe wind gusts as the predominant hazard is then
   expected through the afternoon.

   DISCUSSION...Scattered convection with semi-discrete supercells has
   developed along/ahead of an approaching cold front across portions
   of the middle Ohio Valley with somewhat more isolated convection
   also ongoing across western/central Ohio. The environment ahead of
   these storms remains favorable for all severe hazards, especially
   from eastern into southwestern Ohio where latest mesoanalysis
   suggests effective SRH is greater and may support stronger
   supercells in the near-term. Linear forcing along the front and
   subsequent interactions between neighboring storms should then allow
   for a transition into one or more clusters over the next 1-2 hours,
   with a shift towards damaging/severe wind gusts as the main risk.

   ..Chalmers.. 07/21/2026

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

   ATTN...WFO...PBZ...RLX...CLE...JKL...ILN...LMK...IND...PAH...

   LAT...LON   38298742 38468724 38598672 38718603 38988522 39338439
               39658381 40198301 40308271 40328220 40238163 40178125
               40058088 39908074 39648075 39328100 38988139 38608204
               38238268 37708379 37448446 37438597 37568674 37758714
               38018735 38298742 

   MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN