BLINKING YELLOW ARROW?

Okay, I pull up to an intersection in the left turn lane. The arrow is red, and then blinking yellow. WTF! I don't know what that means! I've never seen this before! I'm confused: can I go, do I wait for a green arrow? In confusion I wait, it turns green and I turn.

What do I do? Google it, of course. So, what else has changed since I left Texas?