Such fronts form west of the circulation center and generally move from west to east warm fronts form east of the cyclone center and are usually preceded by stratiform precipitation and fog. Strong cold fronts typically feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Weather fronts mark the boundary between two masses of air of different temperature, humidity, and densities, and are associated with the most prominent meteorological phenomena. A cyclone's track is guided over the course of its 2 to 6 day life cycle by the steering flow of the subtropical jet stream. Later in their life cycle, extratropical cyclones occlude as cold air masses undercut the warmer air and become cold core systems. These zones contract and form weather fronts as the cyclonic circulation closes and intensifies. Extratropical cyclones begin as waves in large regions of enhanced mid-latitude temperature contrasts called baroclinic zones. Cyclogenesis is the process of cyclone formation and intensification. Cyclones have also been seen on extraterrestrial planets, such as Mars, Jupiter, and Neptune. Upper level cyclones can exist without the presence of a surface low, and can pinch off from the base of the tropical upper tropospheric trough during the summer months in the Northern Hemisphere. Mesocyclones, tornadoes, and dust devils lie within the smaller mesoscale. Warm-core cyclones such as tropical cyclones and subtropical cyclones also lie within the synoptic scale. The largest low-pressure systems are polar vortices and extratropical cyclones of the largest scale (the synoptic scale).
Cyclones are characterized by inward-spiraling winds that rotate about a zone of low pressure. k l oʊ n/) is a large air mass that rotates around a strong center of low atmospheric pressure, counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere as viewed from above (opposite to an anticyclone).
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