Pyrocumulus clouds often form in areas that experience prolonged fire conditions, particularly forest fires, but are also associated with volcanic eruptions and even nuclear explosions. This question focuses on forest fire origins.
An example of what one looks from above, is below:
Caption: Pyrocumulus cloud, above the Oregon Gulch fire in Oregon & California, 2014. Aircraft is a F-15C Eagle. Image source
The general idea of how pyrocumulus clouds are formed is quite well known, and its relationship with a 'firestorm' is, in a simplistic way, is shown below:
Caption: Firestorm: fire (1), updraft (2), strong gusty winds (3) (A) pyrocumulonimbus cloud.Image source
Pyrocumulus and related pyroconvective clouds have been known to have caused severe hail to fall. An example reported in the Earth Observatory: Russian Firestorm: Finding a Fire Cloud from Space, from the Canberra, Australia fires:
Called pyrocumulonimbus clouds, the clouds are capable of dangerous lightning, hail, and strong winds. One such firestorm in 2003 pelted Canberra, Australia, with large, soot-darkened hail, produced a damaging tornado
(Point of reference: Canberra is Australia's capital city, I was there at the time).
Could graupel, or even snow, fall from pyrocumulus clouds?
(It would be good if examples from real life or models could be provided, if possible)