 The Amazon's physical hydroclimate system is controlled by large-scale processes, mesoscale processes, and deforestation scenarios. Large-scale processes control the main seasonal patterns of atmospheric seculation and rainfall, while mesoscale processes create localized seculations like river breezes and deforestation breezes. Deforestation scenarios can also have a significant effect on the Amazon's climate, causing a delay in the rainy season onset of up to 40 days.