A look at megafires as an Oregon wildfire approaches the 100,000-acre markMegafire-Explainer In this photo taken with a drone provided by the Bootleg Fire Incident Command, a pyrocumulus cloud ...

In this photo taken with a drone provided by the Bootleg Fire Incident Command, a pyrocumulus cloud, also known as a fire cloud, is seen over the Bootleg Fire in southern Oregon on July 14, 2021.

A wildfire burning in a sparsely populated region of central Oregon has become the largest fire this year and is on the verge of surpassing 100,000 acres to become what’s officially known as a ...

A wildfire burning in a sparsely populated region of central Oregon has become the largest fire this year and is on the verge of surpassing 100,000 acres to become what's officially known as a ...

A wildfire burning in a sparsely populated region of central Oregon has become the largest fire this year and is on the verge of surpassing 100,000 acres to become what’s officially known as a ...

In this photo taken with a drone provided by the Bootleg Fire Incident Command, a pyrocumulus cloud, also known as a fire cloud, is seen over the Bootleg Fire in southern Oregon on July 14, 2021.

In this photo taken with a drone provided by the Bootleg Fire Incident Command, a pyrocumulus cloud, also known as a fire cloud, is seen over the Bootleg Fire in southern Oregon on July 14, 2021.

A wildfire burning in a sparsely populated region of central Oregon has become the largest fire this year and is on the verge of surpassing 100,000 acres to become what’s officially known as a ...