One poster says this is displayed >100kts. Some questions: I can understand the curiosity of how this vector is calculated, but why are you looking at it? ATC have given you the wind in the takeoff clearance. During takeoff roll you PF is concentrating on the centreline and far end of the runway and speed. Rudder input will tell you which side the wind is coming from.
So my question is, what useful information, at 100kts, is this vector giving you? I also ask the question as to why AB created it rather than inhibit it until wheels up?