Yes, if it is called a vector.
No, if it is called a barb.
Acording to what I found after some searching and reading:
"Remember that wind barbs point in the direction the wind is coming from.
Wind arrows (vectors) point in the direction the wind is blowing towards."
“Also remember that by convention, we speak of winds in terms of the direction they are coming from.”
“Unfortunately, once we start thinking of wind as a mathematical vector, we want to use the mathematical convention for the direction”
(Where wind to East, or from west has 0 degrees.)
"To convert from “meteorological direction” to “math direction”, use use this formula (in degrees):
md = 270 − wwd
where md is the “math” wind direction, and wwd is the “weather wind direction”. If the value is less than zero, just add 360. "
http://colaweb.gmu.edu/dev/clim301/lectures/wind/wind-uv
In Flowx the data is referred to as “Wind Vectors”.
Hence (at least according to the definition linked above):
- the “Wind vector”-“arrow” should point in the direction that the wind is blowing towards, or
- if it is pointing in the direction that the wind is coming from, it should be called wind barbs.
So i see two problems:
- the bug that @tiwag pointed out and @Alex confirmed, that the DWD model is acting different from the other models in Flowx.
- Flowx is not consistent with the definition of wind vectors. Flowx point like a barb, but call it a vector.
(Update: I was wrong in 2.)