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Clouds : classification
Genera species Subspecies

Special forms

Asperitas over Missouri
Asperitas over Tallinn

Asperitas is a relatively rare special form of clouds .


In 2009 the unofficial term Asperatus was proposed for inclusion in the International Cloud Atlas of the World Meteorological Organization . The name means roughly "rough" or "churned up".

Margeret LeMone , cloud expert at the National Center for Atmospheric Research , has been documenting Asperitas clouds since the 1980s and viewed them as a new cloud formation.

On June 20, 2006, Jane Wiggins photographed an Asperita formation from an office building in downtown Cedar Rapids , Iowa , USA .

In 2009 Gavin Pretor-Pinney , founder of the Cloud Appreciation Society , came across the picture and began promoting the cloud formation through the Royal Meteorological Society . Jane Wiggins' photo was posted on the National Geographic website on June 4, 2009 . The Royal Meteorological Society collected evidence of weather phenomena in which Asperatus clouds form in order to investigate their formation in order to decide whether they differ from other undulate clouds.

The name Asperitas was added to the cloud nomenclature on March 23, 2017, on the occasion of " World Meteorological Day ".


The cloud formation is probably most closely related to the subspecies Undulatus . Although they appear dark and stormy, they mostly dissolve without a storm forming. The ominous-looking clouds appear particularly frequently in the states of the Great Plains of the United States, often in the morning or midday after convective thunderstorm activity .

Web links

Commons : Asperitas  - collection of images, videos and audio files

Individual evidence

  1. a b PICTURES: New Cloud Type Discovered? , National Geographic News. June 3, 2009. 
  2. a b c d Asperatus: gathering storm to force new cloud name , The Guardian. 
  3. Orlan Love: Photos: Look, up in the sky - it's a new cloud type! , Cedar Rapids Gazette. June 5, 2009.  ( Page no longer available , search in web archivesInfo: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. @1@ 2Template: Dead Link /  
  4. ( Memento from June 14, 2009 in the Internet Archive )
  6. ^ A b Luke Salkeld: The cloud with no name: Meteorologists campaign to classify unique 'Asperatus' clouds seen across the world , Daily Mail. June 2, 2009. 
  7. Michael Zelenko: Earth's newest cloud is terrifying. In: The Verge . March 24, 2017, accessed March 25, 2017 .