What is a synonym for updraft?

Here are some synonyms for "updraft," depending on the context:

General synonyms:

* Ascending current

* Vertical current

* Rising air

* Thermal (specifically referring to a column of rising warm air)

More specific synonyms:

* Convection current (when the rising air is caused by differences in temperature)

* Draft (in some contexts, especially when referring to air movement within a building)

The best synonym will depend on the specific situation and the nuance you want to convey.