Timelapse is possibly the best way to see how clouds form, break, travel and merge. Conventionaly the method of capture is using a stabilised still cam with an interval timer, either a facility onboard the cam, or computer controlled shutter.

This was to be another sunrise but the clouds turned it into a daybreak sequence.

Converted from 1 hour of video footage with Sony Vegas Pro 8.

I just put the cam outside (in the dark) I didn't notice that I had framed the trampoline and rotary clothes airer until they appeared in the editor.

The light at mid right is a railway signal, long streaks of light are trains, the smaller lights are automobiles on the main highway.

The timecode is not really relevant, I was just testing here, the timecode applies to the first 1:4 pass through Vegas.

Two passes used to get to the final result. Second pass with the velocity feature. (Still learning Vegas on a needs to know basis.)

Graphics as per camcorder output (no enhancements).
Camcorder Sony DCR-TRV245E (Digital 8mm)