First Mission to Fly Through Wildfire Fire Clouds

The first scientific mission designed to fly directly through 'fire clouds'—towering formations that rise above severe wildfires—is scheduled to launch imminently. These pyrocumulonimbus clouds, which can reach altitudes of 10 kilometers or more, are capable of lofting smoke and aerosols to the stratosphere, where they can have global consequences. The mission will investigate these phenomena over severe wildfires occurring in France and Oregon, regions known for experiencing intense fire events. The research aims to understand the composition and behavior of the smoke plumes, their transport mechanisms, and their potential impact on atmospheric chemistry and climate.

Pyrocumulonimbus clouds are a relatively rare but significant consequence of large, intense wildfires. They form when the intense heat from a wildfire heats the air above it, causing it to rise rapidly and condense into a cloud, similar to a thunderstorm. However, instead of rain, these clouds carry smoke, ash, and other combustion byproducts high into the atmosphere. The lofting of these particles into the stratosphere is particularly concerning because the stratosphere is a stable layer of the atmosphere where particles can remain for months or even years, allowing them to spread globally. This contrasts with smoke that remains in the troposphere, which is typically cleared by weather patterns within weeks.

The mission will utilize advanced aircraft equipped with specialized scientific instruments to collect data as it penetrates these turbulent and hazardous cloud formations. The data gathered will include measurements of aerosol size and composition, gas concentrations, temperature, and humidity. Scientists hope to gain unprecedented insights into the microphysical processes occurring within fire clouds, the efficiency of particle injection into the stratosphere, and the chemical reactions that take place in these elevated plumes. Understanding these processes is crucial for improving climate models, predicting air quality impacts, and assessing the broader environmental consequences of wildfires, which are becoming more frequent and intense in many parts of the world due to climate change.

Previous studies have relied on remote sensing and modeling to understand fire clouds, but direct in-situ measurements have been limited due to the extreme conditions and dangers associated with flying through them. This new mission represents a significant step forward in our ability to study these phenomena directly. The findings are expected to contribute to a better understanding of how wildfires influence atmospheric composition, radiative forcing, and potentially even weather patterns far from the fire source. The research is published in Nature, with the online publication date of July 28, 2026, and a DOI of 10.1038/d41586-026-02351-5.