High risk is possible but I still think there are a few things that could negate a high risk...or negate a very significant event from unfolding. It's rather difficult to really portray what I'm trying to say b/c I think a significant event does unfold but I guess it's do we see numerous tornadoes with several long-tracked tornadoes or is it predominately a damaging wind event with several tornadoes? Obviously a large scale widespread damaging wind event can still result in a high risk verification and I think that is possible here.
But two things that stand out to me are;
1) Weakening EML
2) Perhaps widespread convective debris
3) Not so favorable llvl lapse rates
But given the forcing aloft, dynamics, and degree of moisture return a significant and long persisting squall line is quite likely...maybe derecho like. But the lack of an EML may prevent discrete supercells from being the overall game mode...perhaps many initial supercells but congealing into multiple lines. Could be war of updrafts