Why is the precipitation in Shanghai nearly 80% higher than normal?

Since June 1 began to enter the flood season, the average accumulated precipitation in Shanghai is 378.4 mm (as of July 5), which is nearly 80% more than the normal period (June-September 6 14). From 20 o'clock last night to today's 13, there was a general rainstorm in the central and northern parts of the city. 7.44% of the towns and villages in the city exceeded 100 mm, 32.09% exceeded 50 mm, 4 1.86% exceeded 25 mm, and 56.27% exceeded 65438+.

The sudden increase in rainfall is mainly due to the influence of meiyu weather. People call the increased heavy rainfall at this stage violent Meiyu weather. Due to the strong subtropical high this year, the warm and humid airflow in the west and north of the subtropical zone continuously transports water vapor to this area, but the cold air in the north spreads downwards, and the cold and warm air meets in the middle and lower reaches of the Yangtze River, resulting in strong and long-lasting precipitation here.

Meiyu, also known as Meiyu? Mildew rain? , refers to the climate phenomenon of continuous rainy days in June and July in the middle and lower reaches of the Yangtze River in China, Taiwan Province Province in China, south-central Japan and South Korea, which is named because it coincides with the maturity of plums in the south of the Yangtze River. This period is called the rainy season. The beginning and end of meiyu in different years and the intensity of meiyu are very different.

The government and relevant departments should do a good job in emergency work against rainstorm according to their duties; When a rainstorm occurs, it is necessary to cut off the dangerous outdoor power supply, suspend outdoor operations, and transfer people in dangerous areas and residents of dangerous houses to safe places for shelter from the rain; Schools and kindergartens should take corresponding measures to ensure the safety of students and children; According to the road conditions, the traffic management department takes traffic control measures in heavy rainfall sections, and implements traffic diversion in waterlogged sections. Drivers should pay attention to road water and traffic congestion to ensure safety; It is necessary to do a good job in the drainage of cities and farmland, and pay attention to preventing possible disasters such as flash floods, landslides and mudslides. We should try our best to reduce the losses caused by heavy rain.