Truth to tell, the trees are tired. They have been hanging on to their foliage throughout this hot, dry summer. They're looking for an excuse to lay down their load. A heavy rain will do it, so will a brisk wind.
They're preparing for the great un-leaving, still weeks away, but imminent. The equinox is here, and with it a lowering of the light. I want to hold onto as much of the light as I can. Don't we all?