Dan Robinson makes a helpful observation re the capping for what was/is progged as the most explosive area for dangerous tornado development (SW OK):
"Special soundings by the NWS and the COD teams are showing a significantly stouter capping inversion below 700mb than forecast, which is quite possibly the biggest enhancing factor development we've seen today. All of the possible failure modes of this event have vanished, and enhancing factors like more clearing (at least filtered sunlight in most areas) and now a stronger cap have really put this event into a top-level setup in terms of the environment."