Full Breakdown
NASA’s INSPYRE Mission Probes Wildfire-Generated Thunderstorms
8/20/2026, 11:47:06 AM
Core Event: Sampling PyroCumulonimbus Storms Over Utah’s Widemouth 2 Fire
Lightning ignited the Widemouth 2 wildfire on July 27, 2026. The fire remained modest until August 2, 2026, when winds and dry heat more than doubled its size and produced two pyrocumulonimbus (pyroCb) bursts. On August 3, 2026, the NSF/NCAR Gulfstream V flew from Colorado into a high-altitude smoke plume over New Mexico, sampling it at roughly 12 km (8 mi) above the surface. The mission was one of the first direct in-situ measurements of a pyroCb in the continental United States.
Background & Context
PyroCbs are towering, smoke-filled thunderheads that can generate lightning, hail, and heavy rain. Over the past two decades, research has shown that large wildfires can inject particles into the stratosphere via pyroCbs, similar to volcanic eruptions. The INjected Smoke and PYRocumulonimbus Experiment (INSPYRE) is a NASA-led effort that uses high-altitude aircraft, ground radar/lidar, and satellites to characterize these storms. The 2026 fire season focused on the Widemouth 2 fire and a record-breaking burn season in Oregon.
Data & Statistics
- ? 70 pyroCbs occur worldwide each year, many in Canada, Russia, the United States, and Australia.
- 13 pyroCbs have been identified in the continental United States so far in 2026.
- Over 700 documented pyroCb events have been cataloged since the early 2000s.
- Wildfire-generated storms may contribute up to 25 % of black carbon and organic aerosols in the lower stratosphere.
Official Statements & Responses
Michael Fromm (U.S. Naval Research Laboratory) noted that cloud-top brightness temperatures measured by NASA’s Aqua satellite fell below –40 °C, indicating pyroCb tops reached the upper troposphere and possibly the stratosphere.
David Peterson, INSPYRE’s principal investigator, said understanding which fires generate pyroCbs can improve safety for firefighters and evacuation planning, and highlighted that current weather models cannot account for smoke at these altitudes.
Olga Kalashnikova, deputy principal investigator, warned that smoke pushed into the stratosphere can remain there for “a very, very long time,” affecting Earth’s radiative balance.
Verbatim Quotes
- “Morning pyroCbs are much more unusual,” — Michael Fromm
- “None of our weather forecast models allow us to account for smoke,” — David Peterson
On-the-Ground Reports
John Carroll, chief meteorologist at KTVZ, explained that pyro-cumulus clouds form when intense fire heat lifts moist air to the condensation level, producing lightning and hazardous outflow winds.
Conflicting Reports & Gaps
Scientists agree pyroCbs are hard to predict and have not reached consensus on why only some wildfires generate them. Open questions include which vegetation types most readily fuel pyroCbs, why certain storms produce more lightning, and how to incorporate high-altitude smoke into operational forecast models.
What’s Next
The INSPYRE team will continue airborne sampling and ground measurements through September 2026, with another deployment planned for the following summer. Collected data aim to refine forecasting tools, improve fire-management strategies, and deepen understanding of how wildfire-driven storms influence the upper atmosphere.
