Abstract
Tailand is a country with frequent floods. However, the summer of 2011 was abnormal. The heavy rain persisted from July to October, and A large-scale flood occurred. By the flood, I caused great damage to The industrial area of Tailand and Bangkok.Knowing the cause of this great flood of Thailand, it is essential for future disaster prevention in Thailand.The purpose of this study is to explore in the meteorological viewpoint the cause of the flood of Thailand in 2011.