A ridge is an elongated region of relatively high atmospheric pressure, the opposite of a trough. diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure above any area in the Earths atmosphere caused by the weight of air. ... Jump to: navigation, search A trough is an elongated region of relatively low atmospheric pressure, often associated with fronts. ...
Ridges are usually termed hills or mountains as well, depending on size.
Stratigraphic ridge: In places such as the Ridge-and-valley Appalachians, very long, very even, very straight ridges are formed due to the fact that they're the uneroded remaining edges of the more resistant strata that were folded laterally.
Volcanic caldera ridges: Large volcanoes often leave collapsed central calderas that are bordered by circular ridges.
Sometimes, particularly in discussions of atmospheric waves embedded in the westerlies, a ridge line is considered to be a line drawn through all points at which the anticyclonically curved isobars or contour lines are tangent to a latitude circle.
The most common use of this term is to distinguish it from the closed circulation of a high (or anticyclone); but a ridge may include a high (and an upper-air ridge may be associated with a surface high) and a high may have one or more distinct ridges radiating from its center.
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