Continuing bird put in a brief appearance at 11:40 and again at 11:50. It was along Arroyo Seco, north of the footbridge, in the sycamore branches over a small paved access road/trail that drops into the drainage ditch/riparian area proper.
34.266834, -119.165343
The onshore breeze has picked up and it seemed like it favored the leeward side of the sycamore tree (although this observation is derived from a very small sample size).
It disappeared after a minute or two, perhaps going north.
The second time it put in an appearance, it looked like it flew up from the lower riparian veg to the east. Silent. Very active, but easy to lose among the leaves.