Editing Stratus cloud (section)

=== Pattern-based variety ===
Stratus clouds only have one pattern-based variety. This is the ''stratus undulatus'' variety. Mild [[wikt:undulation|undulations]] can be observed from this cloud, only associated by the nebulosus species. Though rare, this cloud formation is caused by disturbances on the gentle wind shear. Stratus undulatus clouds are more common on stratus stratocumulomutatus clouds where the wind is stronger as height increases.{{sfn|WMO|1975|p=43|loc=Description of Clouds}}
[[File:Stratus undulatus 1.jpg|thumb|Stratus undulatus clouds during a rainy day.]]