Ridge (meteorology)
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In meteorology, a ridge or barometric ridge is an elongated area of relatively high atmospheric pressure compared to the surrounding environment, without being a closed circulation. It is associated w
Airflow around troughs and ridges in upper troposphere.
Clouds dissipating in the subtropical ridge.
Subsidence (atmosphere)
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In meteorology, subsidence is the downward movement of an air parcel as it cools and becomes denser. By contrast, warm air becomes less dense and moves upwards.
Ridge (meteorology)
…vorticity advection zone ahead of the upper-level ridge. The vertical downward air motion then gives a divergence of the winds near the surface. The subsidence of the air causes a warming in the column compared to the previous environment and therefore a drying of it because its relative humidity decreases…
Subsidence above the Congo River Basin including the Congo River and some tributaries. Note the lack of clouds above the rivers due to subsidence of colder air which precludes convection, convection being the inverse process to subsidence. Source: NASA
Dosen barometer showing different kinds of weather, according to atmospheric pressure, being high pressure an indication of fair weather because of atmospheric subsidence, and being rapidly diminishing pressure, a sign to a bad weather system approaching.