Storm Prediction Center Mesoscale Discussion 289

   Mesoscale Discussion 0289
   NWS Storm Prediction Center Norman OK
   1004 PM CDT Sun Mar 22 2026

   Areas affected...southeast IN...northeast KY...southern OH

   Concerning...Severe Thunderstorm Watch 73...74...

   Valid 230304Z - 230430Z

   The severe weather threat for Severe Thunderstorm Watch 73, 74
   continues.

   SUMMARY...Severe hail and strong to localized severe gusts should
   diminish overnight as convection spreads east-southeast over the
   central Ohio Valley. A new WW is not anticipated, but a local
   extension of WW 73 may occur given scheduled expiration of 04Z.

   DISCUSSION...A generally broken arc of elevated convection from
   southern IN through central OH has been increasingly congealing into
   a broader linear cluster. This process has yielded a reduction of
   the more numerous hail cores earlier this evening. But a
   longer-lived, tail-end updraft over southern IN has produced hail up
   to golf ball size in the past hour. This could potentially persist
   for the next couple hours as it tracks near the Louisville Metro
   Area. This similar southwest portion of the convective arc has more
   readily accelerated towards the slower cold front. If an organized
   cluster can persist, this may merge into the front and aid in a
   brief uptick in damaging wind potential across northern KY. Still,
   00Z CAM guidance is highly insistent on convection diminishing
   overnight given the modest buoyancy and weakening of lapse rates.

   ..Grams.. 03/23/2026

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

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

   LAT...LON   38388656 39508517 39678427 39888324 39968254 39938216
               39728171 39218171 38768291 38328357 38048474 38048565
               38218644 38388656 

   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN