What is a 'blow up' in wildland fire terminology?

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What is a 'blow up' in wildland fire terminology?

In wildland fire terminology, a blow up describes a sudden surge in fire intensity and rate of spread. It happens when conditions combine to dramatically boost fire behavior—wind that pushes the flames, fuels that are already dry and heated, and topography like steep terrain that preheats upslope fuels and channels warm air. This combination can make the fire grow rapidly, throwing embers ahead and sometimes creating a dangerous convection column. This is different from a long-term stable burn, which would spread at a steady, predictable pace rather than erupt suddenly. It isn’t a weather event that suppresses fire, which would reduce activity. And it isn’t simply a new spark igniting somewhere else; a blow up is the rapid intensification of an ongoing fire due to the surrounding conditions.

In wildland fire terminology, a blow up describes a sudden surge in fire intensity and rate of spread. It happens when conditions combine to dramatically boost fire behavior—wind that pushes the flames, fuels that are already dry and heated, and topography like steep terrain that preheats upslope fuels and channels warm air. This combination can make the fire grow rapidly, throwing embers ahead and sometimes creating a dangerous convection column.

This is different from a long-term stable burn, which would spread at a steady, predictable pace rather than erupt suddenly. It isn’t a weather event that suppresses fire, which would reduce activity. And it isn’t simply a new spark igniting somewhere else; a blow up is the rapid intensification of an ongoing fire due to the surrounding conditions.

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