Anticyclone

An anticyclone is a rotating atmospheric system organized around a region of high pressure. Its circulation direction reverses between the Northern and Southern Hemispheres.

Pressure-gradient force: A force that accelerates air from higher pressure toward lower pressure. It drives air toward an anticyclone’s high-pressure center.
Siberian High: A strong wintertime surface high-pressure system over Siberia and neighboring parts of Asia. It is a major continental anticyclone that drives severe winter cold and outbreaks.
Surface weather analysis: The interpretation of weather maps showing surface pressure, winds, fronts, and observations. Closed isobars and observed winds help forecasters identify surface anticyclones.
Cyclone: A rotating atmospheric system organized around a region of low pressure. Its low-pressure center and generally rising air contrast with anticyclonic structure.
Hadley cell: A tropical atmospheric circulation cell in which air rises near the equator and sinks in the subtropics. Descending branches help establish the subtropical high-pressure belts where anticyclones often form.
Coriolis force: An apparent force caused by Earth’s rotation that deflects moving air and water. It turns air around the high-pressure center and sets circulation direction by hemisphere.
Azores High: A semipermanent subtropical high-pressure system over the North Atlantic. Its seasonal shifts influence weather around the Atlantic basin and western Europe.
Numerical weather prediction: The use of computer models to forecast atmospheric conditions from physical equations and observations. Models predict anticyclone movement, persistence, and interactions with other weather systems.
Tropical cyclone: A warm-core, rotating storm that develops over tropical or subtropical waters. Its intense low-pressure circulation contrasts with a high-pressure anticyclone.
Subtropical ridge: A belt of high atmospheric pressure near the subtropics, often interrupted by individual high-pressure centers. It is the broader pressure feature within which many oceanic anticyclones occur.

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