History
Sir Francis Galton first discovered anticyclones in the 1860s while studying meteorology. Preferred areas within a synoptic flow pattern in higher levels of the troposphere are beneath the western side of troughs, or dips in the Rossby wave pattern. High-pressure systems are alternatively referred to as anticyclones. Their circulation is sometimes referred to as cum sole. The subtropical ridge forms due to the Hadley cell circulation between the equator and the subtropics of the Northern Hemisphere and Southern Hemisphere. Upper-level high pressure areas lie over tropical cyclones due to their warm core nature.
See also: Siberian highSurface anticyclones form due to downward motion through the troposphere, the atmospheric layer where weather occurs. Preferred areas within a synoptic flow pattern in higher levels of the troposphere are beneath the western side of troughs. On weather maps, these areas show converging winds (isotachs), also known as confluence, or converging height lines near or above the level of non-divergence, which is near the 500 hPa pressure surface about midway up through the troposphere. Because they weaken in intensity with height, these high pressure systems are cold.
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