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A high-pressure area, high, or anticyclone, is an area near the surface of a planet where the atmospheric pressure is greater than the pressure in the surrounding regions. Highs are middle-scale meteorological features that result from interplays between the relatively larger-scale dynamics of an entire planet's atmospheric circulation .
In meteorology, a cyclone (/ ˈ s aɪ. 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). [1] [2] Cyclones are characterized by inward-spiraling winds that rotate ...
Large, low-pressure systems, such as tropical cyclones, have cyclonic rotation. Small scale rotating atmospheric features, such as tornadoes, water spouts, and dust devils can have either anticyclonic or cyclonic rotation, since the direction of their spin depends on local forces rather than the Coriolis effect.
Given the direction of the winds around an anticyclonic circulation and the fact that weather systems move from west to east: [2] ahead of an upper-ridge, the airflow that comes from the polar regions and brings cold air. behind the upper-ridge line, the flow that comes from the equator and brings mild air.
Anticyclones generally bring fair weather and clear skies as the dynamics of an anticyclone lead to downward vertical movement which suppresses convective activity and generally lowers the mean relative humidity, in contrast to the upward vertical movement in a cyclone. However as the anticyclone moves over the earth surface it may heat up ...
In most regions, if the atmospheric pressure drops at least 24 millibars within 24 hours, it is considered a bomb cyclone. Bomb cyclones can occur when a cold air mass collides with a warm air ...
Weather maps are created by plotting or tracing the values of relevant quantities such as sea level pressure, temperature, and cloud cover onto a geographical map to help find synoptic scale features such as weather fronts. The first weather maps in the 19th century were drawn well after the fact to help devise a theory on storm systems. [3]
The “anomalously strong” storm system was considered a “bomb cyclone,” which occurs when a cyclone intensifies rapidly. Another, albeit weaker, bomb cyclone may develop and rapidly ...