The last few nights, the sky has been mostly clear, but there has been a lot of lightning in clouds on the eastern horizon.

Last night, the cloud was higher in the sky and the moon was rising behind it, highlighting its rim. I took my camera out to the balcony and set it to shoot continuously as the moon emerged, about every 2 seconds for 20 minutes.

Heres a time-lapse movie. The top surface of the cloud looks like an ocean wave breaking over rocks. You can see a couple of planes fly past too: