Definition
Air subsides and diverges outwards, circulating clockwise in the Northern Hemisphere and anticlockwise in the Southern. Subsidence creates an inversion that suppresses shower cloud but traps moisture and haze beneath it, so summer highs give light winds, good sailing and poor visibility, while winter highs bring frost, low stratus or anticyclonic gloom. Highs move slowly and can block the eastward progress of depressions for days.
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