Storm Prediction Center Mesoscale Discussion 690

   Mesoscale Discussion 0690
   NWS Storm Prediction Center Norman OK
   0126 AM CDT Wed May 08 2024

   Areas affected...Ohio Valley

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

   Valid 080626Z - 080830Z

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

   SUMMARY...A tornado, wind-damage and hail threat will likely
   continue for several more hours across the Ohio Valley. Additional
   weather watch issuance appears likely.

   DISCUSSION...The latest mosaic radar imagery shows a multi-segmented
   line of strong to severe storms located near the Ohio River from
   southeast Missouri east-northeastward into southwestern
   Pennsylvania. The RAP shows the strongest instability from southeast
   Missouri to central Kentucky, where MLCAPE is estimated to be in the
   2000 to 3500 J/kg range. Along this corridor, regional WSR-88D VWPs
   and RAP forecast soundings have 0-6 km in the 45 to 55 knot range,
   suggesting the supercells and bowing line segments will be possible
   tonight. 0-3 km storm-relative helicities near 300 m2/s2 suggests
   that an isolated tornado threat may accompany the strongest of
   supercells. However, the greater threat should be for wind damage
   associated with the more intense line segments. The threats are
   expected to persist through much of the night, but should become
   somewhat more isolated with time.

   ..Broyles.. 05/08/2024

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

   ATTN...WFO...CTP...PBZ...RLX...JKL...ILN...LMK...PAH...

   LAT...LON   39947934 39368008 38688167 38318339 37818543 37268759
               36788949 36759012 36859022 37049029 37229015 37398961
               37808837 38648507 39208255 40088047 40578002 40517933
               39947934