Pyrocumulonimbus Clouds Observed Over Utah's Widemouth 2 Fire
Pyrocumulonimbus Clouds Observed Over Utah's Widemouth 2 Fire
US · Published Aug 17, 2026
A significant pyrocumulonimbus (pyroCb) cloud event was observed over the Widemouth 2 fire in Utah, one of the state's largest wildfires this year.
The fire, ignited by lightning on July 27, 2026, intensified on August 2 due to strong winds and dry conditions, producing multiple pyroCb bursts.

Impact & Risks

PyroCbs are known to generate severe weather phenomena, including lightning, hail, and heavy rain, which can complicate firefighting efforts and evacuation plans. The Widemouth 2 fire's pyroCb activity, including a rare pre-dawn event, added complexity for fire forecasters and emergency responders. These clouds also inject particles and gases into the stratosphere, potentially affecting the ozone layer and Earth's energy balance. The fire's rapid growth and pyroCb formation highlight the challenges posed by extreme wildfire conditions.

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