Is it a snowstorm in 2008 or a snowstorm in 2007?

Snow disaster in 2008. On June 5438+1October 10, 2008, natural disasters such as low temperature, rain, snow and freezing occurred on a large scale, mainly in China. 20 provinces are affected by low temperature, rain, snow and freezing disasters to varying degrees. The direct economic loss due to the disaster exceeds151600 million yuan. Seven provinces, including Anhui, Jiangxi, Hubei, Hunan, Guangxi, Sichuan and Guizhou, suffered the most.

A once-in-a-century heavy snow paralyzed traffic in half of China, and all means of transportation such as railways, highways and aviation were interrupted. At this time in Spring Festival travel rush, hundreds of millions of returnees are stranded.

cause

Experts from the National Meteorological Department of China pointed out that the large-scale rain and snow process should be attributed to the abnormal atmospheric circulation related to La Ni? a (anti-El Ni? o) phenomenon: the long-term meridional distribution of circulation since June+10 in 5438 has made cold air activities frequent, while the subtropical high is strong, and the south branch trough is active. Warm and humid air from the south meets cold air from the north in the middle and lower reaches of the Yangtze River, resulting in heavy precipitation.

The stability of atmospheric circulation made the rain and snow weather last, which eventually led to the occurrence of snowstorms. Meteorologists said that the persistent low temperature in South China is closely related to La Nina phenomenon and abnormal atmospheric circulation. Experts pointed out that in the middle and high latitudes of Europe and Asia, a blocking high pressure appeared at high altitude and lasted for a long time, and the polar vortex remained motionless in Siberia, which led to the continuous invasion of China by cold air from the north.

At the same time of the cold air attack, the warm and humid air currents from the Indian Ocean and the western Pacific Ocean are continuously transported to South China, and the cold and warm air currents meet in the southwest, Jianghan, South China, Jiangnan, Jianghuai and other places, resulting in rare long-term and wide-ranging low-temperature rain, snow and freezing weather. However, experts stressed that the rare snow disaster in China was caused by many factors, and La Nina was not the only one.