A strange cloud formation again whirling and swirling on the tip of a cloud. Strangely this was a calm evening but up there the winds could be very different we suppose.
The boils and whorls must be formed by air rising from the ground and maybe cold air descending either way the cloud is almost forming mamma, but if they are it's not on dramatic sky covering scale.
Clouds, take some time to study them wherever you are.