International Cloud Atlas

International Cloud Atlas
Hugo Hildebrand Hildebrandsson (1838-1925) · Public domain · source
Name	International Cloud Atlas
Author	World Meteorological Organization
Country	International
Language	English (originals in multiple languages)
Subject	Cloud classification, meteorology
Publisher	World Meteorological Organization
Pub date	1896–present
Media type	Print, digital

Contents

International Cloud Atlas is the authoritative pictorial and descriptive reference for cloud classification maintained by the World Meteorological Organization and its antecedent, the International Meteorological Organization. First published in 1896, it standardized cloud nomenclature used by agencies such as the United States Weather Bureau and the Met Office, and informed observational practices at institutions including the Smithsonian Institution and the National Oceanic and Atmospheric Administration. The Atlas has influenced scientific work at organizations like the Royal Society, the Royal Meteorological Society, and the Bureau of Meteorology, as well as operational procedures at civil aviation authorities and research at universities such as Imperial College London and Massachusetts Institute of Technology.

History

The Atlas originated from conferences convened by the International Meteorological Organization and proposals by figures linked to the Meteorological Congress of 1891 and the Brussels Conference (1896). Key contributors included Luke Howard's earlier nomenclature legacy, participants linked to the Royal Society, and national services such as the Austrian Hydrographic Office and the Deutscher Wetterdienst. Early editions responded to work at observatories like Kew Observatory and field campaigns organized by the Scott Polar Research Institute and the British Antarctic Survey. Throughout the 20th century, updates were debated at sessions of the World Meteorological Congress and influenced by research from laboratories at the Max Planck Institute and the National Center for Atmospheric Research. International collaboration involved delegations from the League of Nations era and later from agencies of the United Nations system.

The Atlas sets out morphological and developmental criteria for cloud genera, species, varieties, and supplementary features used by services such as the National Weather Service and the Canadian Meteorological Centre. It codifies terms tracing to Luke Howard and organizes forms identified during research at institutions like Scripps Institution of Oceanography and Woods Hole Oceanographic Institution. Content covers visible structure, altitude ranges tied to tropopause dynamics studied at European Centre for Medium-Range Weather Forecasts, and processes like convection investigated at CERN-linked atmospheric projects and the European Space Agency. Photographic plates and diagrams have been produced by observatories including Greenwich Observatory and research groups at Princeton University. The Atlas links cloud classification to phenomena recorded by platforms such as GOES, Meteosat, and Terra (satellite).

Major editions were produced in 1896, 1932, 1956, 1975, 1987, 2017, and later digital updates coordinated by the World Meteorological Organization and national services like the Japan Meteorological Agency and the China Meteorological Administration. Revisions incorporated research from projects at Lamont–Doherty Earth Observatory and experimental results from programs like TOGA and CLOUD at CERN. Editorial decisions were debated at international meetings involving delegations from the United Kingdom, United States, France, Germany, Italy, Japan, Canada, and Australia. Special thematic supplements have featured contributions from centers including the Max Planck Institute for Meteorology and the National Institute of Water and Atmospheric Research.

Production relied on photographic collections from institutions such as the Smithsonian Institution, the U.S. Army Signal Corps, and university archives at Harvard University and University of Oxford. Printing and distribution engaged publishers with ties to the United Nations system and national printers commissioned by agencies like the Servicio Meteorológico Nacional (Argentina) and the Indian Meteorological Department. Digitization projects partnered the European Organisation for the Exploitation of Meteorological Satellites with libraries including the British Library and the Library of Congress. The editorial process involves committees drawn from bodies like the International Council for Science and academic contributors from University of Cambridge and Yale University.

The Atlas underpins operational manuals used by civil aviation regulators, informs curricula at institutions such as City, University of London and Penn State University, and supports climatological datasets used by the Intergovernmental Panel on Climate Change and the United Nations Framework Convention on Climate Change secretariat. It has guided remote-sensing classification algorithms developed at NASA centers and influenced iconography adopted by services like Environment and Climate Change Canada and the Bureau of Meteorology. Research citing the Atlas appears in journals associated with the Royal Meteorological Society and has been applied in studies at the Arctic Council and regional bodies like the European Environment Agency.

Critiques addressed representativeness of photographic samples from collections at the Smithsonian Institution and the National Archives and the degree to which classifications matched findings from campaigns such as Project Stormfury and TOGA. Debates at meetings of the World Meteorological Organization and academic disputes involving groups at Columbia University and the University of Reading questioned cultural and regional biases, satellite-era adequacy raised by teams at NOAA and ESA, and intellectual property issues involving publishers and national agencies like the Royal Meteorological Society and the American Meteorological Society. Controversies also touched on adoption by aviation regulators including the International Civil Aviation Organization and on integration with cloud microphysics research from laboratories at Lawrence Berkeley National Laboratory and Los Alamos National Laboratory.