Wind shift before weather change of front arriving.

This video is a time lapse of a couple of hours.
Notice how the wind is coming from the bottom right at the start of the picture (northwest) but from dead ahead by the end (west). It has 'backed'. Together with the cloud changes - note the wispy cirrus appearing near the end too - is a sign of a front and bad weather approaching. Rain started 18 hours after this time lapse. This video illustrates one of the concepts in Chapter 3 of the book, The Secret World of Weather:
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[@christianmother27]

Ok, the sky is beautiful in this video, lol.