Air in motion relative to the surface of the earth. Almost exclusively used to denote the horizontal component.

Same as wind sock.

The direction from which the wind is blowing, measured in points of the compass or in azimuth degrees.

See gust and peak gust.

The distance or length of flow of the air past a point during a given interval of time.

A flower-like diagram indicating the relative frequencies of different wind directions for a given station and period of time.

The distance or length of flow of the air past a point during a given interval of time.

A local variation of the wind vector or any of its components in a given direction.

Same as windsock.

A fabric cone attached to a metal ring and used to indicate wind direction. often at airfields.

Rate of wind movement in distance per unit time.

An instrument used to indicate wind direction.

A component of the wind (often using Cartesian coordinates. i.e. X and Y wind vectors). Also, an arrow representing wind velocity, drawn to point in the direction of the wind and with a length proportional to wind speed.

A vector term which includes both wind speed and wind direction.

A rotation anemometer in which the axis of rotation is horizontal. The instrument has either flat vanes (as in the air meter) or helicoidal vanes (as in the propeller anemometer). The relation between wind speed and angular rotation is almost linear.

The wind speed and direction at various levels in the atmosphere above the level reached by surface weather observations.

The measurement and computation of wind speeds and directions at various levels above the surface of the earth. Methods include pilot balloon observations, rabals, rawin or rawinsonde observations, radar tracking, or acoustic sounding.

A graphical aid used in the reduction of data from a winds aloft observation.

Situated on the side from which the wind blows.

A wave resulting from the action of wind on a water surface.