The diagram illustrates the formation of a rain-shadow desert.
Overall, the process consists seven stages, beginning with the winds approach the coast which is near the mountain range and ending with the formation of a rain-shadow desert. Noticeably, the rain falls on the windward side, while the dry air reaches the leeward side, creating drier conditions.
Initially, the winds which approach the coast near the mountain range is pushed upwards along the windward side. As the humidity rises, the winds cools, creating the condition for cloud to be formed. As it reaches the top of the mountain range, the moisture in the cloud are enough to create rain. After rain falls, the moisture in the cloud are removed, creating drier air
When the dry air comes over the mountain, it reaches the leeward side, where the dry winds are formed. Afterwards, the dry winds continue to reach further the inland areas. Finally, it reaches the inland, where the condition are dry enough and the rain-shadow desert is formed.
