The Intensification of the front is represented by the PVA thickness PVA which indicates cloud enhancement due to the curvature shear of jet crossing. This signal can also be detected in IR images WV images WV images as dark stripes or dark areas due to sinking rising sinking motions. The presence and location of the Jet are represented by the Isotachs, which indicate the lines of equal vorticity speed speed . The maximum observed speed indicates the location and orientation of a Jet Streak. When a Jet Streak crosses a frontal zone with a small large large acute angle an increase of cloudiness in the left right left exit region of this crossing jet streak can be observed.

---