HN 39:
It represents the component of velocity along the aircraft longitudinal axis only. I don't know if it is significant.
But intuitively it would seem to indicate the possibility of some air molecules being ingested directly down the pitot opening. Other air molecules maybe not so lucky. The 107 groundspeed is a given.
Intuitively, I've been wrong before.
(BTW, people may be mis reading the previous ILS example. The ILS beams are effectively inertially stabilized. Wind will affect aero AOA on a fixed inertial FPA, if holding a constant pitch attitude, horizontal speed & vertical speed. I understand the conditions portrayed in MM43's graphic. Start postulating winds and see what you get for the same exact geometry.)