is really part of a maintenance process for geostrophic balance on the rotating Earth in response to frontogenesis.

Warm front

Warm fronts are at the leading edge of a homogeneous advancing warm air mass, which is located on the equatorward edge of the gradient in isotherms, and lie within broader troughs of low pressure than cold fronts. A warm front moves more slowly than the cold front which usually follows because cold air is denser and harder to lift

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