Definition
A ridge is an elongated extension of an anticyclone, with isobars curving anticyclonically; it brings a temporary lull, backing wind and clearing skies between two depressions. A trough is the opposite, an extension of low pressure with cyclonically curved isobars, often marked as a thick line on charts. Trough passage brings a wind veer, a squall line, and a burst of heavy showers even without a full frontal system.
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