wind-direction shaft

A representational mark for wind direction on a synoptic chart, it is a straight line drawn directly upwind from the station circle; the wind arrow is completed by adding the wind-speed barbs and pennants to the outer end of the shaft.

Related terms:

• magnetic wind direction
• prevailing wind direction
• wind direction
• true wind direction
• maximum-wind and shear chart
• barb
• five-and-ten system
• geostrophic-wind scale
• great-circle direction
• wind rose