This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Just minutes into a planned research flight from Colorado to Oregon in August to study massive storm clouds fueled by intense wildfires, scientists discovered that a fire in Utah offered a more promising target. The mission support staff on the ground scrambled to draw up a new flight plan, and the pilots of the U.S.
National Science Foundation National Center for Atmospheric Research (NSF NCAR) Gulfstream V worked to get the green light from air traffic controllers to fly toward the wildfire-generated thunderstorm. This was the type of agile maneuvering that enabled scientists on a major field campaign this summer to take unprecedented observations of powerful pyrocumulonimbus, or "firestorm," clouds. Such clouds are notorious for producing hazardous weather, including dry lightning strikes, strong downbursts of wind and fire tornadoes, along with dense smoke plumes that can rise to the cruising altitudes of aircraft and rapidly move across North America.
The major field campaign, known as INSPYRE (which stands for INjected Smoke and PYRocumulonimbus Experiment), is a collaborative effort by NASA; the Naval Research Laboratory; the University of Nevada, Reno; and NSF NCAR, among other partner organizations. Deploying two aircraft as well as ground instruments, the research team gathered a rich trove of data about the properties and chemical composition of the clouds and their behavior in the atmosphere. Scientists expect the data collected during INSPYRE will lead to new insights into pyrocumulonimbus, which are one of the least understood forms of severe weather on Earth.
This can improve weather forecasting, aid firefighting efforts and potentially give aircraft more information about avoiding turbulence and other hazards when flying near major fires. INSPYRE is scheduled to span five years, with another field deployment in 2027 followed by three years of scientific analysis and publication. It is funded through NASA's Earth Ventures program.
"This first INSPYRE deployment gave us an unprecedented opportunity to observe fire-generated storms from multiple perspectives and at multiple stages of their development," said David Peterson, research meteorologist at the U.S. Naval Research Laboratory and principal investigator for INSPYRE. "The NSF NCAR Gulfstream V was a critical part of that effort, allowing us to directly sample smoke and the environment surrounding these storms while our other observing systems looked at them from above and from the ground." "We now have an extraordinary data set that will help us better understand why some wildfires generate these powerful storms, how they transport smoke into the upper atmosphere, and ultimately how we can improve our ability to predict their impacts." Pyrocumulonimbus storms form when intense wildfires generate towering thunderstorm clouds capable of producing lightning, tornado-like fire whirls, erratic winds and massive smoke plumes that rise as high as the stratosphere.
These storms can whip up flames through powerful gusts and also ignite new fires through lightning strikes, creating a dangerous self-sustaining cycle that remains poorly understood and extraordinarily difficult to predict. "Being able to predict when a fire is going to have enough energy in the right atmospheric environment to create these clouds is very challenging," said NSF NCAR scientist Teresa Campos, who used two instruments called spectrometers on the GV aircraft to measure concentrations of several gases. "There's so much we don't know about pyrocumulonimbus clouds, and we need to learn more both because of their impacts as they form over the fires and also because these densely polluted air parcels are very long-lived, moving around the Earth and influencing weather and atmospheric properties for thousands of miles downwind." To learn more about the storms, scientists deployed two aircraft: NASA's high-altitude Earth Resources-2 (ER-2) aircraft based in Great Falls, Montana, and the NSF NCAR Gulfstream V (GV) based in Broomfield, Colorado.
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