Isotachs 300 hPa:
There is a large jet streak close to the leading edge of the Warm Front Shield. This is a very typical configuration for a Warm Front. The jet axis is aligned with a cloud fibre along this leading cloud edge, however the jet axis is more to the south of this fibre. This deviation is seen quite often and might be an indication that the jet core is higher than 300 hPa.
Shear Vorticity 300 hPa:
The zeroline of shear vorticity is aligned with a cloud fibre along the leading edge of the Warm Front Shield. However,
the jet axis is more to the south of this fibre. This deviation is seen quite often and might be an indication that the
jet core is higher than 300 hPa.
TFP:
The TFP is very well developed indicating a strong Warm Front situation and it is within the cloud shield. However, the
example is not a very typical shield, it can also be interpreted as a transition from a Warm Front Band to a Warm Front
Shield; the band character still can be clearly recognised and the TFP is close to the rearward edge of the higher cloud.
Equivalent Thickness:
There is a distinct area of high gradients in the thickness field within the cloud area of the Warm Front Shield. The main
part of this zone of high gradients is more to the leading edge. This is very typical for a Warm Front Shield.
Temperature Advection 700 hPa:
There is quite a lot of WA in the area of the Warm Front cloud shield. The important criteria for discriminating between a Warm Front Band and a Warm Front Shield is that the WA maximum is not only in the leading part of the Warm Front cloud but there is also a secondary maximum to the rear, in the warm sector itself. This can be clearly seen in this case, although two well separated maxima, as would be expected in an ideal case, are not seen in this example.