Photos capturing massive, cauliflower-shaped clouds have surfaced on social media in the Vancouver area, identified by experts as pyrocumulus clouds formed by a wildfire over 200 kilometers away. The B.C. Wildfire Service reported the discovery of the Anderson Creek fire by aircraft responding to nearby fires on Tuesday, noting its rapid escalation driven by strong winds.
According to Matt Loney, a meteorologist from Environment Canada, each fire releases significant heat energy, with the Anderson Creek fire exhibiting intense growth. Images shared on social media platforms on Tuesday depict towering cumulus clouds juxtaposed against dark smoke columns in the sky, visible from locations like Coquitlam, approximately 220 kilometers away.
Loney explained that any source generating sufficient heat to induce strong convection currents can trigger the formation of these clouds, characterized by hot air ascending rapidly and condensing moisture. He likened the process to opening a freezer door on a scorching summer day, causing fog to descend due to temperature differentials.
The clouds contain various particulates, including burning embers, dust, and ashes, which become visible to the naked eye. As the cloud reaches a stable temperature level, it expands horizontally. The vertical growth of the pyrocumulus cloud resulting from the Boston Bar-area fire indicates both extreme heat intensity and atmospheric instability, making it visible from multiple vantage points.
Rachel White, an assistant professor of atmospheric sciences at the University of British Columbia, described the Fraser Canyon cloud images as remarkable yet unsettling. While White expressed scientific curiosity in witnessing pyrocumulus clouds, she acknowledged the awe-inspiring and nerve-wracking aspect of observing the formidable power of wildfires.
Additionally, she highlighted the potential danger posed by these clouds, as they can generate thunderstorms with lightning strikes, potentially sparking additional wildfires. The likelihood of lightning creation within the cloud system hinges on the specific environmental conditions in a given area.