Highs & Lows

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High: an area of the atmosphere where the pressure is high relative to that in the surrounding region at the same level. It is always associated with anti-cyclonic circulation (clockwise in the Northern Hemisphere); same as an anticyclone.

Low: a region of the atmosphere in which the pressures are lower than those of the surrounding regions at the same level. Since a low is always associated with cyclonic circulation (counterclockwise in the Northern Hemisphere) the term is used interchangeably with cyclone. It is also called depression.

Air flow and circulation

The pressure is high at the surface where air is slowly descending. In fact, a high is an area of sinking air. As air descends, it warms, which inhibits the [...]

Storm Track

It is the path followed by a cyclonic disturbance, for example, a center of low atmospheric pressure, a severe thunderstorm, or a tornado. It also roughly corresponds to the mean trajectory [...]