warm conveyor belt

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A relatively narrow flow of air that transfers significant amounts of heat, moisture, and momentum from lower latitudes towards the poles. In a northern-hemisphere depression, for example, it flows northwards roughly parallel to the cold front, and rises up the warm front, producing cloud and often giving significant amounts of precipitation. It tends to split, with a secondary conveyor belt closer to the depression centre, contributing to the cloud head. The main warm conveyor belt finally turns towards the east and south-east, spreading a shield of cirrus ahead of the low-pressure system.

Subjects: Meteorology and Climatology.

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