Abstract
The variable rainy seasons in these countries are discussed in relation to the windfield. NE trade winds, SE trade winds, equatorial westerlies, ITCZ, NE monsoons, SW monsoons are important for the analysis of heavy rainfall in the low latitudes. For the area north of 10°N, tropical disturbances are also important. Most of these disturbances move through Thailand in autumn. Their season is later than in the case of Japan.
The concentration of heavy rainfall in a small area is also interesting. There is an area of about 100km×100km on the eastern coast of Malaysia with over 100mm rainfall per day in the winter monsoon season.
Five years moving means of monthly rainfall for many places are calculated. The amplitudes and phases of climatic change are very variable from place to place. The standard deviations of monthly rainfall are also calculated. These values are much larger than in the case of Japan, and vary according to the place and the season.
