Scene notes:

… in daylight heating above distant trees. Birth of a Cumulonimbus, a rising congestus carrying enough moisture to darken and sprout rain while it grows nearer. This exemplar of a congestus, a towering Cumulus cloud that has not become a Nimbus, reaches higher and higher into the sky until the day has become cloudy with a high chance of precipitation. Often other low stratus clouds obscure clouds like this, but they are quite common.
Time-lapse length (30 fps):
23 seconds and 1 frame..