Gigantem Albus Turrim

The Giant White Tower!

Look at the top of the mountain in the very bottom of the photo. That should give you some perspective on how enormous this towering cloud was.

I have never seen one like it. I had to actually find a quick spot on the road to pull over and run to a clear area to take the photo. I even missed part of the top which dissipated before I could stop the car.

I was amazed. Take a look in large. I didn't do any cropping to make this look any larger than it was. This is the photo as I took it.