Physics Photo of the Week

February 9, 2007

Cloud Waves
On January 18, 2007 I saw these parallel bands of heavy clouds on a highly overcast day.  Having seen formations like these before and ever curious I was anxious to study these whether or not they were moving; whether there was any cycling up and down in the clouds.  When watching clouds, they usually appear motionless because they move rather slowly.  Digital cameras and "cheap film" enable the production of time-lapse movies very easy.

Click on the image or the link here to see the animated result and some more explanation.  Large bandwidth is needed because the animated image is about 1 MB - a large file.

Physics Photo of the Week is published weekly during the academic year on Fridays by the Warren Wilson College Physics Department.  These photos feature an interesting phenomena in the world around us.  Students, faculty, and others are invited to submit digital (or film) photographs for publication and explanation.  Atmospheric phenomena are especially welcome.  Please send any photos to

Click here to see the Physics Photo of the Week Archive.

Observers are invited to submit digital photos to: