NASA's INSPYRE Campaign Chases Rare Wildfire Thunderclouds
The Hunt for PyroCb Clouds
Wildfire smoke does more than drift across the sky—it can spawn its own violent weather systems. NASA researchers call these pyrocumulonimbus (or pyroCb) clouds, and they behave like thunderstorms fueled by fire rather than the sun's warmth. The INSPYRE campaign—standing for INjected Smoke and PYRocumulonimbus Experiment—was designed specifically to study these elusive phenomena.
The campaign got an unexpected head start when the Wildhorse grass fire erupted in eastern Idaho, producing a massive pulse of smoke that launched a pyroCb cloud. No one had predicted it, but the event gave scientists a firsthand look at how wildfires can generate their own weather.
Why PyroCb Clouds Matter
Pyrocumulonimbus clouds inject smoke, aerosols, and trace gases directly into the upper atmosphere—sometimes reaching the stratosphere. This makes them significant not just for weather patterns, but also for air quality and climate modeling. Understanding how they form and evolve helps scientists improve predictions of wildfire behavior and their broader environmental impacts.
The INSPYRE team spent weeks deployed in the field, using aircraft, ground instruments, and satellite data to observe and measure these fire-spawned thunderclouds as they developed.