Definition
A vertical current of air moving upward, typically caused by surface heating, air being forced up sloping terrain, or convective activity within a developing cloud.
Plain English
A column of air rising upward, usually because the ground is warming it or terrain is pushing it up.
Context Anchor
Pilots encounter updrafts near hills and mountains, under building clouds, over heated ground, and in turbulence reports.
Derivation
From 'up' (direction) and 'draft,' an old word for a current of air being drawn or pulled along. So an updraft is simply a current of air being drawn upward.
Why Pilots Care
Updrafts can produce sudden altitude gains, turbulence, or lift that affects climb performance and requires pilot awareness near convective clouds.
Grounding Statement
On a sunny afternoon, sun-warmed ground heats the air above it; that warm air rises in a column -- that rising column is an updraft.
Intuition Check
An updraft is not the same as the airplane climbing by engine power. It means the air around the airplane is moving upward.
Example Sentence 1
The pilot felt a strong updraft as the aircraft passed over the sun-heated field, and the altimeter briefly showed a climb.
Example Sentence 2
The glider pilot circled in the updraft along the ridge to gain several hundred feet without power.