• The cloud band lies in warm advection. This is normally true at all levels (this is different from Cold Fronts in Cold Advection; see Cold Front In Cold Advection - Key parameters ). Sometimes the cloud band is in warm advection but the surrounding is in cold advection.

The image shows pronounced WA at the frontal cloud band.

• The relation between Thermal Front Parameter (TFP), equivalent thickness (crowding zone at the cloud band), absolute topography, PVA (maximum at the rear edge) and the cloud band are very similar to those of classical Cold Fronts. (see Cold Front - Key Parameters ).

The image shows typical frontal conditions although they are quite weak in this case.

• Advection of humidity shows a pattern similar to other types of Cold Fronts: positive humidity advection in front, negative advection behind the front. The zero line of humidity advection, therefore, lies in an area where warm advection already prevails.

The image shows moist advection within the frontal cloud band and dry advection at the rear edge. In this case the zero line of HA is at the rear side of the cloud band and there is extraordinary high moist advection. This is in agreement with the high WA indicating the approach of a Warm Conveyor Belt.