What is the Latin name for firestorm?

Answer 1

That's a hard one.

Closest is "flammidemmia" - harvest of fire. Doesn't have storm in it, but it's one word and it's a powerful poetic image so it's analogous to our use of "firestorm"

It could be "storm of fire" - tempestas ignis/flammae. Coining with flammi- is better than igni- IMO, as the destructive power of fire is much more commonly expressed using flamma than ignis.

There is simply no way to translate it literally, period.