Just my speculation, I think we're seeing a general slight upward trend from reopening, a mild spike from Memorial Day Weekend activity, and now perhaps a secondary rise from the protests and riots. It's going to be really difficult to untangle all of that, and perhaps it's not even really necessary. As stated, the key metric is hospital/ICU capacity.
But I'm still interested in what's unique about Houston compared to Austin/Dallas/San Antonio when it comes to the recent hospitalization increases.