When is the rainy season in Nanjing?

The latest weather news in Nanjing on June 22, 2022:

According to the latest meteorological data analysis, it is predicted that Nanjing will enter the Meiyu period from June 23rd, which is slightly later than normal (June 19). Plum blossoms appeared in the first half of mid-July, which was the same as normal (June 13).

The length of meiyu period is close to normal or slightly shorter (23-24 days), and the amount of meiyu is 250-300mm, which is close to normal (258.8-293.0mm). This year, the Meiyu belt swings greatly from north to south, and the precipitation is characterized by strong convection, heavy rainfall and uneven distribution of rainfall. During this period, there may be obvious intermittent precipitation and staged high temperature weather.

Formation conditions of plum rain

1. There is blocking high pressure or stable high pressure ridge in the middle troposphere in high latitudes of Asia, and the atmospheric circulation is relatively stable with little change.

2. The westerly circulation in the mid-latitude area is gentle, and frequent short-wave activities provide cold air conditions for the Jianghuai area.

3. The western Pacific subtropical high has an obvious process of extending westward and jumping northward. The ridge line of the 500 HPA subtropical high is stable between 20 and 25 degrees north latitude, and the warm and humid air flow is transported from the edge of the subtropical high to the Jianghuai basin. Under this circulation condition, Meiyu front lingers in the Jianghuai basin, often accompanied by southwest vortex and shear line, and the mesoscale system on Meiyu front is active. It not only maintains the continuous precipitation during the Meiyu period, but also provides abundant water for the rainstorm.