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Occlusion is a kind of weather front that exists in some depressions. It occurs when the cold air in a depression completely lifts the warm air off the ground. The result is the formation of one wide belt of rain-bearing cloud instead of the two bands normally due to separate cold fronts and warm fronts. When warm air moving into an area of cold air, the pressure forces the warm air to rise over the cold air. As the warm air lifts into an area of low pressure clouds form as flat sheets. Also when cold air moving into an area of warm air. The cold air forces its way under the warm air forcing the warm air to rise. The warm air then condenses producing rain.

As air moves from high to low pressures it produces the global prevailing winds, known as trade winds. The trade winds are strongest between the high and low pressures with wind speeds relatively low at the pressure belts.

Occlusion is dealt with the weather system and atmospheric pressure circulation occurances.