Spider Weaving

I saw this lady busily at work next to the sidewalk in Newport Beach. It's a bit wobbly, but it'll give you an idea just how fast these critters are once they get going.

The picture below was taken on Balboa Island, but it's the same sort of spider, at least, as far as I can tell.

A post on bugguide.net has her tagged, tentatively, as a Western Spotted Orbweaver.