She strikes and strikes the shrilly circling boy till the stick breaks in her hand. His tears are rainy weather to woundlike memories:
Apparently the woman has caught her prey (uh oh). She's so angry that she "strikes and strikes" the boy.
He's still running around in circles, and crying in a very shrill ("shrilly") voice.
This woman—sheesh. She's hitting him so hard that the stick breaks. (Think about that for a sec.) This woman is hitting hard.
The boy is crying, and his tears are the equivalent of a stormy, "rainy weather" to… "woundlike memories"?
Okay, first off, why "woundlike"? Is that even a word? Technically no, but this is poetry, and that's a simile. If somebody's memories are like wounds, that means they hurt. They're not the nice, happy memories you might have of, say, this place.
Now, we say "somebody's" because, really, it's not clear whose memories are "wound like."
Our gut says it's the woman's, but we can't be too sure. It's possible that the speaker is talking about the boy here, or even about himself. Let's read on…