Warm Front Shield
Warm Front Shields are accompanied by cloud shields comprising the areas of the warm sector and the Warm Front.
The classical physical Warm Front model as well as the conveyor belt theory of Warm Fronts do not discriminate between the Warm Front Band and the Warm Front Shield. But the main difference between the Warm Front Band and the Warm Front Shield is the cloudiness within the warm sector. In case of the warm front shield the cloudiness within the warm sector is associated with a more or less pronounced upper level front and there is a pronounced ascending Warm Conveyor Belt on the various surfaces of these frontal zones. It overruns the Warm Front surface lines and mostly exists in a deep layer of the troposphere. This may be the reason for thick cloudiness and precipitation in the warm sector behind the surface front. It contrast for the case of a warm front band there is not enough ascending motion within the Warm Conveyor Belt, which is the reason that no cloudiness develops.