A convectional rainfall diagram gives a visual representation of the process through which atmosphere produces convectional rain. The diagram starts with warming land, which heats the air above it and causes the air to expand and rise. Clouds form and rain falls as the air condenses and cools.
Convectional rain occurs most often in warm, sunny areas where the ground is exposed to a lot of direct sunlight. Generally, high land temperatures tend to lead to large amounts of convectional rain. This rule explains why hot places such as sub-Saharan Africa or the Indian subcontinent receive a high convectional rainfall each year.