What term refers to the burning of foliage from the bottom up, sometimes referred to as candling?

The term "torcing" describes the phenomenon where fire spreads upwards through the foliage, often giving the appearance of a candle flame. This effect occurs when the heat from the fire ignites the canopy and branches, allowing it to consume the vegetation from the bottom to the top. This upward movement of fire can lead to more intense heat and can also contribute to the fire spreading more rapidly through the area.

Understanding this term is crucial for recognizing fire behavior, especially in wildland firefighting scenarios. By identifying torcing, responders can make informed decisions about tactics and safety measures needed to combat the fire effectively. The other options represent different fire behaviors or phenomena not specifically related to the upward burning of foliage but rather to dramatic changes in fire intensity and behavior under varying conditions.