Cross-section O

Strong upward motion (minimum omega) is found in the middle of the cross-section. Looking at the satellite image and the location of the cross section O it can be concluded that the strongest upward motion coincides with the occlusion point. Descending motion is found in the right-hand side of the cross-section, where the isentropes show warm front character.

Isotach maximum is located at 300 hPa in the region of the highest pixel values. Compared to the cloud band in the satellite image it can be seen that the jet streak is found near to the occlusion point.

Very strong positive vorticity maximum is located near the occlusion point. If omega is overlayed, it can be seen that voticity maximum is located in the same region where the strongest ascent occurs. This vorticity is also well documented in the satellite image, because the cloud band forms a distinct spiral in that place!

Massive area of warm advection covers the right half of the cross section. This is the region to the right of the occlussion point, connected to the warm part of the occlusion spiral. Note how the strongest warm advection maximum is located in the upper troposphere and coincides with the point where the tropopause folding starts. Cold advection is not very pronounced.

Positive vorticity advection maximum located in the middle of the cross-section is connected to the center of the cloud spiral seen in the satellite image. Note how the vorticity advection maximum is found in the same place where the warm advection and also upward motion is the strongest!