Dan said:
Try this one. It was very difficult to find.

http://www2.mmm.ucar.edu/imagearchive/

Dan Reagan

Hey Dan,
Thanks so much for posting this link! I've been searching for years to find something like this. Nice job in digging it out. This looks like the best one posted here. You can even play a 24 hour loop of the day.

http://www2.mmm.ucar.edu/imagearchive/