Relative Humidity:
High humidity ahead of the frontal zone and low humidity behind it fits well to the concept of an active Ana Cold Front,
which the back bent front has turned into.
Temperature Advection:
In this case the cold advection behind the back bent front is so intensive, that is has advanced to the frontal zone and
pushed weaker warm advection ahead and above.
Divergence:
There is convergence within the frontal zone, except a small area of weak divergence, possibly due to the decaying low
centre ahead of the front. The divergence above the frontal zone is very weak.
PVA:
The maximum of PVA above the front is connected to the left exit region of the jet and it typical for Cold Fronts and
Occlusions. Another maximum neat the surface is connected to earlier warm Occlusion. The weak NVA partly within the
frontal zone deviates from the theoretical situation.
Vertical Motion (Omega):
The ascending motion above the frontal zone is as expected. The descending motion has advanced within the frontal zone
from behind due to the strong cold advection.