Isotachs

Isotachs are lines on a given map that indicate both the direction and velocity of windspeed. Often used in conjunction with isobars, the two combine to provide powerful insight as to exact atmospheric conditions. Wind speed variance is shown through sometimes through the tails of the arrows, such as below, or sometimes in the size of the arrow. The direction is shown through the way that the arrow points as the direction the wind is heading.



Found - www.sabah.gov.my