Elements within the cloud (such as the edges of the undulations) are generally darker than those in cirrocumulus and smaller than those in stratocumulus.
Wiggins' photograph was posted on the National Geographic website on June 4, 2009. Margaret LeMone, a cloud expert with the National Center for Atmospheric Research has taken photos of asperatus clouds for 30 years, and considers it a likely new cloud type. These undulations can be visible as wave-like patterns at the base of the clouds, but most of the time they are invisible to the naked eye.
However, a hallmark of formation that determines whether the cloud will be altostratus undulatus is the circumstances surrounding the formation.
Altostratus undulatus clouds can be defined as a form of altocumulus clouds.
As the name would suggest, these sorts of clouds normally have undulations at their base. The name translates approximately as "roughness". It is the first new formation added to the These wave-like structures form on the underside of the cloud to makes it look like a rough sea surface when viewed from below.The way in which asperitas clouds form is somewhat a mystery, yet there is much debate and confusion over how the wave-like clouds come into existence. Altocumulus Undulatus Asperatus is a rare, newly recognized cloud formation. The width of these clouds is generally less than 300 feet (91.44 meters) thick. Crédit: Richard Huntington.L'Ecosse livre aussi la beauté de son ciel. Crédit: Alex Schwab.La Nouvelle-Zélande est décidemment un endroit de choix pour les observer.
Asperitas (formerly known as Undulatus asperatus) is a cloud formation first popularized and proposed as a type of cloud in 2009 by Gavin Pretor-Pinney of the Cloud Appreciation Society.Added to the International Cloud Atlas as a supplementary feature in March 2017, it is the first cloud formation added since cirrus intortus in 1951. The exact morphology of each cloud is affected by:Depending on the above variables, the altostratus undulatus clouds may have a morphology ranging from mild furrowing to formation of waves that arenât connected by any cloud.Altostratus undulatus clouds can be seen in any part of the world.
Altocumulus Undulatus Asperatus is a rare, newly recognized cloud formation. Asperitas (formerly referred to as Undulatus Asperitas) is a distinctive, but relatively rare cloud formation that takes the appearance of rippling waves. In 2009 Gavin Pretor-Pinney, founder of the Cloud Appreciation Society, came across the image and began working through the Royal Meteorological Society to promote the cloud type.
 On June 20, 2006 Jane Wiggins took a picture of asperatus clouds from the window of a downtown office building in Cedar Rapids, Iowa. Sometimes, they are in the form of a continuous layer with an undulating surface.
Crédit: Wiel Koekkoek.Un vaste splendide nuage dans le ciel de l'Illinois. The name is derived from unda, the Latin word for a wave. The altocumulus undulatus is a mid-level cloud (about 8000 - 20,000 ft or 2400 - 6100 m), usually white or grey with layers or patches containing undulations that resemble "waves" or "ripples" in water. Tout ce qu'ils peuvent dire c'est que le phénomène ressemble à des undulatus ou des mammas très spectaculaires en vagues inversées, des variétés de nuages déjà répertoriées [7].
These clouds can be seen in any part of the world, as long as the variables that are needed to form them are present.
One theory does suggest that they are formed when mammatus clouds descend into areas of the sky where wind direction changes with height causing the wave-like movement.What is clear however is that atmospheric conditions must be unstable to form a wavy cloud base like that seen with asperitas.Though the formation itself does not produce rainfall, asperitas have been linked to thunderstorms, occurring afterwards. Crédit: Agathman.Une apparition des nuages en Hollande. Altostratus undulatus clouds can be defined as a form of altocumulus clouds.
These wave-like structures form on the underside of the cloud to makes it look like a rough sea surface when viewed from below. Between then and 2015 the case was supported by members of the public sending in images of the dramatic cloud formations.It is not yet defined what cloud type gives its home to asperitas, but the WMO began work on deciphering the cloud's mysteries in 2008. Should the cloud type be officially recognized, it will be the first new variety since 1951.
This is due to the fact that these clouds occur at an altitude that can be considered as average for most cloud types. The presence of alto… It is hypothesised that their appearance is associated with the aftermath of convective thunderstorms, though they have also been sighted in relatively calm environments. Ceux qui me connaissent savent que j'aime les nuages intéressants et en ce moment, aucun n'est plus intéressant que undulatus asperatus. Crédit: Ken Prior.Une formation d'undulatus asperatus dans le ciel du Missouri.
These waves are normally parallel to each other, but there are scenarios where the waves cross link as well. Altocumulus undulatus (Ac un) | International Cloud Atlas These clouds may appear both as patches or as covering the sky. It is believed that a disruption in the stability of the cloud layer, such as that caused by a passing jet, may induce the domino process of evaporation which creates the hole.
Undulatus asperatus, de nouveaux nuages en quête de reconnaissance.
We propose that asperatus should be adopted as a new ‘variety’ of cloud, meaning that it is a particular characteristic that appears in one or other of the main cloud types. Though the likely unstable atmospheric conditions required to form the wavy cloud base could also allow the growth of convective rain clouds, meaning that asperitas could be accompanied by other, precipitation-producing clouds.The addition of this previously undocumented cloud formation to the World Meteorological Organisation's International Cloud Atlas was first proposed by the Cloud Appreciation Society in 2008. Such clouds are not unique to one geographic area and have been photographed from the United States to Russia.