Mesoscale Discussion 0687 NWS Storm Prediction Center Norman OK 0920 PM CDT Tue May 07 2024 Areas affected...Ohio Valley Concerning...Tornado Watch 196...197...198...199... Valid 080220Z - 080315Z The severe weather threat for Tornado Watch 196, 197, 198, 199 continues. SUMMARY...Scattered severe thunderstorms will sag southeast across the OH Valley this evening. DISCUSSION...Scattered severe thunderstorms, including isolated supercells and short-line segments, arc from central OH-southern IN-extreme southeast IL. This activity is propagating slowly southeast along the northern fringe of greater buoyancy. As the LLJ increases across the upper OH Valley later this evening, a more eastward shift is expected toward the PA border, though air mass is notably less unstable immediately downstream within this warm-advection corridor. Several long-lived supercells persist, and given the shear, will likely continue, especially from southern IN into southern OH. ..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 39178776 39608452 40338359 41118291 40808179 39158277 38598486 38408815 39178776