Storm Prediction Center Mesoscale Discussion 689

   Mesoscale Discussion 0689
   NWS Storm Prediction Center Norman OK
   1116 PM CDT Tue May 07 2024

   Areas affected...Ohio Valley

   Concerning...Tornado Watch 197...198...199...

   Valid 080416Z - 080615Z

   The severe weather threat for Tornado Watch 197, 198, 199 continues.

   SUMMARY...Scattered severe thunderstorms will sag southeast across
   the Ohio Valley into the early morning hours.

   DISCUSSION...Great Lakes short-wave trough is shifting east late
   this evening and the primary corridor of large-scale ascent is
   focused across the lower Great Lakes/upper OH Valley. Deep
   southwesterly flow will persist in the wake of this feature, and
   water-vapor imagery does not depict any appreciable upstream
   disturbances. Northern corridor of stronger instability extends into
   this region, and ongoing scattered severe convection should continue
   to sag southeast toward the OH River Valley over the next several
   hours. Large hail threat appears to have waned a bit but several
   supercells persist along this corridor. Given the observed shear,
   some tornado risk continues, along with hail approaching 1-1.5
   inches.

   ..Darrow.. 05/08/2024

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

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

   LAT...LON   39488517 39478344 40958158 40548068 38768274 38538590
               37368859 37878905 39298631 39488517