In June, the weather in many provinces across the country was a bit abnormal. High temperature and heat waves were raging in many places in the north. The duration and intensity were rare in the same period. The Central Meteorological Observatory has issued high temperature warnings for 10 consecutive days, and some people even made a national heat cry warning map.
In addition to the high temperature in the north, it is a different scene in many areas in the south. Floods have occurred in many places in southern China and Jiangnan, and 117 rivers in the Pearl River Basin have exceeded warning floods. On June 15, a once-in-a-century high tide occurred in the central urban area of Guangzhou. All passenger ship routes in the urban area were suspended. Some netizens said that Guangzhou had become “Guangzhou”.
“Floods in the south and droughts in the north”, is this June normal? What is the reason? The reporter from Guangming Daily interviewed Yuan Yuan, researcher of the Climate Prediction Office of the National Climate Center, Zhang Tao, chief forecaster of the Central Meteorological Observatory, Hu Xiao, chief meteorological analyst of China Weather Network, Zhou Bing, chief expert of meteorological service of China Meteorological Administration, and Xu Xiaofeng, president of China Meteorological Service Association. Wait for experts.
Regarding the cause of this round of high temperature weather, Yuan Yuan said that since June, the water vapor conditions in the lower troposphere in the Huanghuai region have been deviated,Most areas are dominated by sunny, hot and less rainy weather with less precipitation.
Especially after June 15, the sky over the Huanghuai area was controlled by a high-pressure ridge, and the sinking airflow caused a significant warming effect; at the same time, due to the influence of short-wave solar radiation during the day, coupled with the dry atmosphere, the ground heated up rapidly.
The combination of these factors has resulted in high temperature weather in the local area.
In the future, the high temperature in the north will gradually weaken. After the northwest Pacific subtropical high is lifted northward, the subtropical high will mainly control Jiangnan and the central and eastern parts of South China.
Hu Xiao said that the high temperature weather was mainly affected by the eastward-moving high-pressure ridge, which led to sunny, hot and less rainy weather in many places in the north. In addition, due to the influence of short-wave solar radiation during the day, the weather was dry, which was conducive to the gradual rise of ground temperature. The significantly higher surface temperature is mainly caused by the strong solar radiation.
As for the rainfall in the south, Zhou Bing said that the reason for the continuous heavy rainfall in the south recently,On the one hand, under the background of global warming, the instability of the atmospheric circulation system is strengthened, resulting in enhanced convective activity, increased precipitation efficiency, and increased rainfall during precipitation;
On the other hand, the ongoing La Niña event provides an important climatic background for the early occurrence of summer storms in the South China Sea this year and the early progress of the rainy season in my country. The southwest water vapor transport guided by the monsoon circulation is relatively strong. The continuous transport of water vapor in the Northwest Pacific affects the areas of South China and Jiangnan in my country.
In addition, while the water vapor conditions are abundant, the meridional degree of the atmospheric circulation in the middle and high latitudes of Eurasia increases, which affects the frequent cold air activities in the eastern part of my country. Especially since June, the northeast cold vortex has become more active and developed southwardly. From the south to South China, the precipitation in the pre-flood season in South China is abnormally high.
Hashtag: high temperature rainstorm weather
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