Height Contours 1000 hPa:
The Secondary Low is well developed with the centre right above the cloud vortex.
Isotachs 300 hPa:
The jet maximum near the secondary low is over 50 m/s, which is required for the secondary development.
Curvature Vorticity 300 hPa:
There is a maximum of curvature vorticity over the secondary low. Another, smaller maximum south to it is related to a
Comma.
Shear Vorticity 300 hPa:
There is positive shear vorticity over the Secondary Low due to the jet, although the maximum values are more to the
south.
TFP:
The TFP isolines neatly follow the occluded front.
Equivalent Thickness:
The isolines show the tongue of thickness in an old Occlusion.
Vertical Motion (Omega):
There is ascending motion over the deepening low.