I'm giving all the credit to the sky. it was a no look, quick shot through the windshield. it wasn't until I got home that I noticed that the camera got shifted from aperture priority to shutter priority, and I was just lucky that it was set to 1/60s instead of 1/2s. at least the clouds were prominent enough for the autofocus to find something to give a good focus.
maybe I'll take credit on at least having the camera level.