I wouldn't call it a positive effect, but at a little past midnight (8/27), I heard a strange low frequency sound. I went out to find that the old and large hackberry tree cluster at the northwest corner of my yard had lost footing and a trunk approximately 16" in diameter fell between my house and the one next door. I came out okay, but it fell on my neighbor's pickup truck, crunching in the camper shell. It took a while to wake him up, during which another big trunk fell while I watched. This one landed atop his truck, fortunately supported enough by branches to not make much of an impact. He came out, and drove the truck out from under, sacrificing the camper shell to save the truck.
These trees are very old and have been through lots of rain, but I guess it was too much this time. There was no wind to speak of.