烽火爆（Firestorm）是一种经常出现在大范围火灾中的一种自然现象。

由于大范围的火灾，其火场的分布相当多，火灾范围内的空气流动加速，这也就造成了火场上空对流发展的空间；在一个可能成为旋风中心的有利地点，周遭的热空气不断因燃烧而上升，而挤压到了高空中的冷空气持续向下填补，在两者不断的作用下，以及四周火场隔离开来的真空环境，形成了巨大的烟囱效应；这时只要一有外来的风力——甚至是地球自转所带来的科里奥利力——协助，这一个巨大的火烟囱便会开始出现像涡轮般的旋转。

由人的肉眼去看，在旋转中而形成的外观很类似龙卷风，故而亦有人称之为「火龙卷」。但事实上，火龙卷跟烽火爆是两样成因和性质均不相同的事物。

A firestorm is a conflagration which attains such intensity that it creates and sustains its own wind system. It is most commonly a natural phenomenon, created during some of the largest bushfires and wildfires. Although the word has been used to describe certain large fires, (like the 2016 Fort McMurray wildfire) the phenomenon's determining characteristic is a fire with its own storm-force winds from every point of the compass. The Black Saturday bushfires and the Great Peshtigo Fire are possible examples of forest fires with some portion of combustion due to a firestorm. Firestorms can also occur in cities, usually as a deliberate effect of targeted explosives such as occurred as a result of the aerial firebombings of Hamburg, Dresden, and the atomic bombing of Hiroshima.