Plain English Meaning

Wind that is not steady — it speeds up and slows down quickly, sometimes also changing direction.

Full Definition

Wind characterized by rapid, irregular fluctuations in speed of 10 knots or more between peaks and lulls over a short period. Gusts are brief surges above the prevailing average wind speed and may also shift in direction.

Context Anchor

Encountered during takeoff, lift-off, landing, and weather briefings when wind is reported with sudden increases or uneven changes.

Derivation

‘Gust’ comes from the Old Norse ‘gustr,’ meaning a sudden cold blast of wind. The original sense — a sharp, short burst — still fits exactly what a pilot feels in gusty conditions.