Updraft (noun)

A current of rising air, especially in a confined space, such as a chimney, that can provide lift for a hovering bird or aircraft, or cause a fire to spread.

Origin:

From the early 17th century; combination of up- and draft.

Examples:

1. The updraft in the chimney was so strong it nearly lifted the fire out of the fireplace.
2. The glider pilot used the updraft to gain altitude.
3. The updraft carried the ash and embers from the forest fire into the sky.
4. The hot air balloon relied on the updraft to stay aloft.
5. The updrafts near the mountain peak made it difficult for the helicopters to fly.