Mesocyclones form when air rises and rotates in a "pillar" of sorts. It's sometimes associated with thunderclouds and tornado formation.
A certain kind of cumulonimbus, the cumulonimbus flammagenitus, can form above a firestorm of sufficient strength (magnitude, temperature, whatever the thing being measured is). Some cumulonimbus flammagenitus clouds have generated true fire tornados (as opposed to the fire whirl, which is commonly called a fire tornado) indicating that these clouds do form mesocyclones.
My question is, could a firestorm generate a hurricane-like cyclone, with strong surface winds along a large area, raining ash and embers? If so, would it move or be stationary? How long could it sustain itself? What would be involved in its formation?