Most people can't see a minute hand moving, but it moves nonetheless.
It's a matter of patience. The problem with observing cloud rotation
is that the cloud is constantly changing shape, therefore you cannot
time lapse the same way you can when observing vertical development
(or determining that a minute hand moves). As noted in my impolite
post, you need to spend a half hour on your back. Then we can move on
to discussing whether there's any real advantage to be had.