How Pyrocumulonimbus clouds are formed when wildfires spit storms, lightning

Sub: Geo

Sec: Climatology

Increasing Frequency of Pyrocumulonimbus Clouds Due to Wildfires:

Intense wildfires in the US and Canada are generating ‘pyrocumulonimbus’ clouds, which can produce thunder and potentially ignite new fires.
The frequency of these clouds has risen significantly, with Canada recording 140 such clouds during the extreme wildfire season of 2023, compared to an average of 50 annually.

Formation of Pyrocumulonimbus Clouds:

Not every wildfire leads to the creation of pyrocumulonimbus clouds. They occur only when there is an extremely hot wildfire. Volcanic eruptions can also lead to the formation of pyrocumulonimbus clouds.
As the intense heat pushes air upward, water vapour condenses on ash particles, creating pyrocumulus clouds.
If the upward heat and moisture continue to intensify, these clouds evolve into pyrocumulonimbus clouds, which can reach heights of 50,000 feet and create thunderstorms without significant rainfall, thus posing a risk of sparking new wildfires.

Reasons for Increasing Occurrence:

The rise in pyrocumulonimbus events may be linked to climate change, as increasing global temperatures lead to more frequent and intense wildfires.
Although the exact cause is unclear, more wildfires provide more opportunities for these clouds to form, with atmospheric conditions playing a key role.
Scientists suggest that as wildfires become more intense, the likelihood of pyrocumulonimbus clouds also increases.

Source: IE