Hadley cell
The direction of the wind at various levels of the atmosphere determines local climate and can result in severe weather patterns. For example, in an El Nino winter the presence of warm water in the eastern Pacific Ocean can shift the position of a subtropical jet stream. This results in heavy rainfall in the tropical wet forest ecoregion. Also, in a warming climate the Hadley cell could increase the severity of climate. As a result, the ecoregion may become hotter and wetter for longer periods of time.