Radiation and humidity conditions make the atmospheric layering extremely unstable. Huge cumulus clouds which can reach a height of 14-20 km form in the rising air masses. Evaporation is high due to the very wet underlying surface. Rainfall, which occurs almost daily, is spread relatively evenly over the year (but is stronger when the ITCZ, which has lower pressure than the surrounding area, lies over the region). On the large scale, the humid tropics are the areas with the highest precipitation on Earth. The Amazon Basin, parts of equatorial West Africa and some parts of Southeast Asia, are typical representatives of this precipitation regime. An example is given in Figure 6, which shows the monthly mean of precipitation for Singapore, which has an annual sum of 2423 mm.
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