Firestorm is a more powerful version of fire. It only appears in SimCity 2000 and SimCity DS.

SimCity 2000

In SimCity 2000, a fire storm is a mass fire. The fire storm is auto triggered but it may happen if the player types in Saldom.

SimCity DS

In SimCity DS firestorms are mini-games that the player must blow on the DS microphone to put out fires.