Originally Posted by
CounterTerroristWins
Impossible. The true air speed is 494, they ground speed is 502, so there is a wind component of 8kts tail wind. The arrows represent a head wind component.
It's not a navigation-quality instrument readout, there is at least a few seconds delay in updating most of the the readings - they aren't "real time".
As the aircraft appears to be banking to the left in the image, I would hazard a guess that there was actually a small but measurable headwind component prior to the turn. After the turn there is now an 8kt tailwind component with the majority of the wind still coming from the starboard side. In a few moment's time the headwind arrow will reverse to show there is a tailwind.