Bulletin

The WMO Bulletin is the official journal of the World Meteorological Organization. The Bulletin was first published in 1952 and is produced in English, French, Russian and Spanish. The Bulletin is currently issued twice yearly in print and online.

A new edition of the International Cloud Atlas is scheduled to be released simultaneously with this Bulletin following three years of hard work. 

Humanity has a primordial fascination with clouds. The meteorological and hydrological communities have come to better understand cloud processes through decades of observation and research.

Warm or cold, polluted or clean, over a mountain or a field, a cloud’s characteristics are key to the success or failure of cloud seeding efforts.

“Climate is what you expect, weather is what you get.” What is the difference between weather and climate?

Learn more about the WMO process of naming clouds and WMO Technical Regulations. 

Take a look at the cloud photos that are featured on the WMO 2017 calendar and were selected from submissions from around the world.