Frontal Inversion

Where adjacent air masses of different temperature intrude on each other there is a 'frontal zone', discussed in Chapter 13. A 'cold front' occurs when a cold air mass wedges underneath a warmer one. So a temperature sounding through the wedge shows a slanting boundary between colder air below and warmer air above, i.e. there is an inversion at the boundary. In this case, the inversion indicates the inclement weather associated with a front, whereas a subsidence inversion implies calm and clear weather (Chapter 13). Frontal inversions exist from the surface to about 3 km elevation, and typically are only a few hundred metres deep.

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