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Orographic rain occurs when the air is cooled sufficiently as a result of

Orographic rain occurs when the air is cooled sufficiently as a result of Correct Answer Lifting due to flow over a mountain barrier , <span style="font-family:arial,helvetica,sans-serif"> Lifting due to flow over a mountain barrier</span>

Concept

The different forms of precipitation are as follows:

Frontal rainfall: It occurs when two air masses meet, one a warm air mass and one a cold air mass. The lighter, less dense, warm air is forced to rise over the denser, cold air. This causes the warm air to cool and begin to condense. As the warm air is forced to rise further condensation occurs and rain is formed. Cyclonic rainfall is another term for frontal rainfall.

Orographic or relief rainfall: It is produced when moist air is lifted as it moves over a mountain range. As the air rises and cools, orographic clouds form and serve as the source of the precipitation, most of which falls upwind of the mountain ridge.

Convectional rainfall: When the land warms up, it heats the air above it. This causes the air to expand and rise. As the air rises it cools and condenses. If this process continues then rain will fall. This type of rainfall is called convectional rainfall.

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