Definition
The side of an obstruction, terrain feature, or structure that is sheltered from the wind — the downwind side. Air flowing over the obstruction descends and becomes turbulent on this side, often producing rolling, swirling currents and downdrafts that can extend well beyond the obstruction itself.
Plain English
The side that the wind blows toward after passing over something. If wind hits a hill, the leeward side is the back side — where the air tumbles down and gets choppy.
Context Anchor
Seen in weather, mountain flying, and discussions of wind flowing around buildings, trees, ridges, or other obstructions.
Derivation
From the Old English 'hleo,' meaning shelter or protection. The 'lee' of something is the sheltered side — out of the wind. In aviation, that sheltered side is also where descending, turbulent air collects, so 'sheltered' does not mean 'calm.'
Why Pilots Care
Downdrafts and turbulence on the leeward side can rapidly reduce aircraft performance and create hazardous conditions during mountain flying.
Grounding Statement
If wind hits a ridge from one side, the leeward side is the side after the wind crosses the ridge.
Intuition Check
Do not think of leeward as the side facing the wind. Leeward means the downwind side—the side the wind goes to after passing the object.
Example Sentence 1
The pilot avoided descending on the leeward side of the ridge, where strong downdrafts and turbulence were likely.
Example Sentence 2
Strong winds created severe downdrafts on the leeward side of the mountain range.