What is this cloud genre called?

volutus
calvus
fractus
humilis
A long, typically low, horizontal, detached, tube-shaped cloud mass, often appearing to roll slowly about a horizontal axis. The roll cloud, volutus, is a soliton, not attached to other clouds and is an example of an undular bore.
ShadowMaster
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Very interesting!
reach: rather globalcloudsmeteorologyweather

Answers by country

volutus
calvus
fractus
humilis
answers
flagAustralia
61%
14%
19%
4%
21
flagthe United Kingdom
40%
10%
30%
20%
10
flagIndia
35%
21%
28%
14%
14
flagthe United States
33%
27%
22%
16%
18
flagGreece
30%
0%
10%
60%
10
flagPoland
28%
25%
22%
23%
692
flagGermany
26%
6%
26%
40%
15