Storm Prediction Center Mesoscale Discussion 1899

   Mesoscale Discussion 1899
   NWS Storm Prediction Center Norman OK
   0129 PM CDT Mon Aug 10 2026

   Areas affected...Portions of western Ohio

   Concerning...Severe Thunderstorm Watch 554...

   Valid 101829Z - 102000Z

   The severe weather threat for Severe Thunderstorm Watch 554
   continues.

   SUMMARY...The risk of severe storms may be increasing in parts of
   western Ohio, and an extension of Severe Thunderstorm Watch #554 may
   be warranted.

   DISCUSSION...The latest visible satellite imagery shows deepening
   boundary-layer cumulus evolving in the vicinity of a N/S-oriented
   outflow boundary along the western flank of earlier convection that
   moved through central OH. Here, steep midlevel lapse rates atop a
   warm/moist PBL are contributing to a strongly unstable air mass.
   This, combined with around 30-40 kt of effective shear, may support
   intensification of thunderstorms along this corridor over the next
   few hours. There may be some tendency for storms to track eastward
   into the stabilized air mass, though any sustained storms that track
   southeastward along the boundary will be capable of producing
   damaging wind gusts and severe hail. An extension of Severe
   Thunderstorm Watch #554 may be warranted in parts of western OH to
   cover this risk.

   ..Weinman.. 08/10/2026

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

   ATTN...WFO...RLX...ILN...IWX...

   LAT...LON   38588358 39108406 39798434 40418446 40668431 40728406
               40678379 40518355 40228333 39828320 39248291 38798272
               38488311 38588358 

   MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN