Storm?

I drove home at 5:50 today, along the road called the Speedway that runs between the two graveyards. A white pebble-like thing, coming nearly straight down from the sky, suddenly struck my car hard. No one could have thrown a stone that hard or that straight down. Was it a single, entirely isolated hailstone? Does that ever happen?

Home, I saw the sky shift through some strange colors. I kept expecting a dramatic storm. Then, sitting in the dark with my computer in the dining room, I realized that night had fallen, and no excitement at all was in the offing.