For the past 3 years of unusual clouds, called Undulatus asperatus, or "wavy-rough", and wait for the official classification compete for the title of a particular type of clouds.
The proposal to make this kind of a classification was made back in 2009 the organization Cloud Appreciation Society. If this request is granted, it will be the first change in the International Cloud Atlas since 1951. Most similar to the form of the clouds layered. Despite his gloomy storm mode, "wavy-rough" clouds disappear without incurring bad weather. Most often, they can be observed in the plains states of the USA. The World Meteorological Organization is continuing to examine the conditions of their appearance and their behavior in various environmental situations.