from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a dense cloud associated with fire or volcanic activity.
Sorry, no etymologies found.
The fire and its updrafts of warm air even generated some of its own thunderclouds -- "pyrocumulus," according to Kevin Kraujalis, meteorologist with the National Weather Service in Duluth.
The easternmost fire in the image is extreme enough that it produced a pyrocumulus cloud, a dense towering cloud formed when intense heat from a fire pushes air high into the atmosphere.
The pyrocumulus cloud and the detection of smoke in the stratosphere are good indicators that the fires are large and extremely intense.
"We call it pyrocumulus, where all the ash coming out of the fire causes lifting and convection, and can cause a thunderstorm-looking top," he said.
I found myself wondering what they would have thought of the pyrocumulus smoke clouds soaring over the city.