If by liminal you mean layers where one could remain after breaching a barrier from below, as with a strong thermal busting through a mild temperature inversion, no. It was more that the thermals were dissipating, possibly in layers of differing (and changing) wind direction.
The Afterbay is the large, shallow reservoir just SW of the Devil Canyon Power Plant. It comes “after” the original small pool at the plant. We have AJX because the construction of the Afterbay was going to encroach on the original Pinecrest Airpark.
