Why are there floods every year in the south?

Floods occur every year in the south, but the scope of their impact is uncertain.

For example, in 2010, floods affected the entire south. In 2011, 2013 and this year, they only affected the middle and lower reaches of the Yangtze River. In contrast, in 2013, there were no floods in the Yangtze River at all, and there were burrows in the plumes. Lasts for several days.

In fact, judging from the past few years, the most serious year for floods in the south was 2010.

On March 6, 2010, a sudden heavy rain fell in Hangzhou, Zhejiang Province. The day was like night, and the heavy rain lasted for a long time, eventually causing urban waterlogging and farmland damage. At the same time, the lowest temperature that day was only 3.6°C, and the highest temperature was only 4.9°C. Everyone wore cotton-padded clothes and raincoats to go out by boat, and went to relatively safe areas to take shelter from the rain. This scene was unprecedented. Cause of floods: Strong cold air and warm and humid air flow met in Hangzhou, and the early temperature was obviously high (for example, on February 24, the highest temperature in Hangzhou was 24°C, and some pedestrians wore short sleeves when traveling), thunderstorm clouds were formed, and the weather never appeared It improved until March 6, when a stronger cold air moved southward, causing the warm and humid air on the ground to rise violently, resulting in rare floods in this season. This phenomenon is called "early spring flood" in meteorology, also known as "early flood".

On April 13, 2010, there was also a fierce collision between strong cold air and warm and humid airflow, but this time the floods affected a wider area, starting from Hangzhou, Zhejiang, to northern Fujian. Along with the continuous heavy rains, the temperature also dropped sharply. After the cooling, most of the south actually "entered winter overnight", resulting in rare late-spring cold weather. Fortunately, the temperature quickly rose after the weather cleared up, and the impact of this late spring cold came to an end.

On May 5, 2010, it was still cold air. The impact of this flood disaster has spread to the junction of the three provinces of Hunan, Guangdong, and Jiangxi. Taking the flood disaster in Shaoguan City, Guangdong as an example. Around 9 o'clock, Ruyuan County first turned from cloudy to rainy. At first, the rain was equivalent to light to moderate rain. However, in less than 2 hours, the local rain suddenly intensified, and the heavy rain has swept across the entire Shaoguan City. At this time, there was lightning and thunder over Shaoguan, and bursts of muffled thunder indicated that the heavy rain would continue to intensify. Until 20 o'clock in the evening, the rain suddenly weakened in Ruyuan County, which was the first place to receive rainfall. However, within a few hours, the heavy rain resumed and hit the entire urban area of ??Shaoguan again. On May 6, the entire Shaoguan City had already turned into a vast ocean, and the local meteorological observatory determined that the intensity of this rainfall was a heavy rainstorm.

On June 22, 2010, during the Meiyu season, many places in Fujian, Jiangxi, Zhejiang and other provinces suffered floods, of which the second flood in Shaowu, Fujian was an example. From June 18 to 20, 2010, Shaowu, Fujian Province continuously experienced rare floods, resulting in water and power outages in most areas of the city. Among them, the entire Zhongshan Road was flooded, and various schools issued notices of school closures. It wasn't until June 23 that the local rain abated, but the entire urban area of ??Shaowu was already devastated. For example, at the airport in Shuibei Town, floods carried a large amount of sediment and deposited it on the ground, making it inconvenient for pedestrians to walk.

On September 11, 2010, Taiwanese floods hit Hangzhou, Zhejiang Province again, turning the whole city into a vast ocean.