What does the rainy season mean?

Meiyu season refers to the rainy weather that lasts for a long time in the Jianghuai basin in early summer, which coincides with the yellow maturity of plums, hence the name.

Meiyu period refers to the period of continuous rainy weather in the middle and lower reaches of the Yangtze River in China from mid-June to mid-July every year. At this time, the utensils are easily mildewed, so they are also called "mildew rain", and when the plums in the south of the Yangtze River are yellow, they are also called "plum rain" or "Huang Meiyu". The time that the rain belt stays is called "Meiyu season", the day when the rainy season begins is called "entering the plum blossom", and the day when it ends is called "emerging the plum blossom".

cause

The formation of Meiyu is the result of long-term stagnation of cyclones or fronts in the local area. During May and June of each year, the subtropical high in the western Pacific is rapidly strengthened, and the hot and humid tropical marine air mass and equatorial air mass expand to Nanling area of China, and contact with the colder temperate air mass from the north to form a front.

Cyclones or troughs are constantly generated. When these cyclones or troughs move eastward, they are often blocked by the high pressure along the coast of China, so they move slowly and stay in the southeast hills, the middle and lower reaches of the Yangtze River and the southern part of the Huaihe River basin for a long time, causing continuous rain everywhere.