Perhaps the wind vector icon was designed for phones with lower screen resolution?
Modern phones has so high resolution that the icon becomes verry small, and it is hard to detect the direction of the tiny arrow, or even that is actually is an arrow.
I suggest an update of the icon to a more simple design, so that the direktion of the arrow is more clear, eaven when it is presented by the tiny pixels on a hi-resolution phone screen.
Continuing the discussion from Wind indicator shows wrong wind direction using DWD: