Resources

Resources

Learn how to identify cloud types by using this flow chart from the International Cloud Atlas. Clouds are divided into 10 fundamental types known as genera, depending on their general form. The genera are then further subdivided based on a cloud’s particular shape, structure and transparency; the arrangement of its elements; the presence of any accessory or dependent clouds; and how it was formed.

Download the World Meteorological Day Programme in: English | French

Posters

 
Download the WMO leaflet on Understanding Clouds

Download the WMO Understanding Clouds Poster in six languages:

English | French | Spanish | Arabic | Chinese | Russian

Cloud Classification Guide

Download the WMO Cloud Identification Guide:

English | French | Spanish | Arabic | Chinese | Russian

Download the Low-Level Cloud Classification Ais:

English | French | Spanish

Download the Middle-Level Cloud Classification Aid:

English | French | Spanish
  

Download the High-Level Cloud Classification Aid:

English | French | Spanish