SUMMARY…Severe threat will increase across MS and southeast LA over the next several hours. New Tornado watch will be issued by 19z to address this threat.
DISCUSSION…Boundary-layer air mass is gradually heating across MS into western AL where surface temperatures are now in the upper 70s. As a result, buoyancy has increased a bit downstream of ongoing corridor of strong-severe convection. Latest radar data exhibits an expanding MCS across ww82 that is expected to spread/develop toward central MS over the next few hours. While pre-MCS convection has struggled to exhibit long-lived supercell characteristics, this remains a possibility. New tornado watch is warranted downstream to address this upward-evolving convective threat.
