20 10-20 1 1 What's the winter temperature forecast?

Strong winds in Northeast China and North China cooled down.

The meteorological department of China also warned that autumn flood and cold winter should be prevented this year. The recent weather in North China and Northeast China of China is also colder than normal. In the middle of last month, the Central Meteorological Observatory issued a forecast, pointing out that the cold air activities affecting China were frequent at the end of September, and the average temperature in the eastern, northern and northeastern parts of northwest China was lower than normal 1 to 2℃, and the temperature in parts of northeastern Inner Mongolia and northern Heilongjiang was even lower by 3℃.

On the 5th, the Central Meteorological Observatory pointed out that a new cold air will hit the northern part of China, and the northeast and north China will face strong winds to cool down. In the next three days, the temperature in some areas will drop by more than 8℃, and there will be heavy rain in some areas.

Chinese oceanographers believe that the catastrophic flood disaster in China in 1998 was caused by "El Nino-La Nina phenomenon" and ecological deterioration in the Yangtze River basin. The snowstorm in southern China in early 2008 was also closely related to La Nina. This year's "La Nina" activity is strong and deserves close attention.

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What is La Nina phenomenon?

"La Nina" and "El Ni? o" are both natural phenomena, which occur in the Pacific Ocean, the Atlantic Ocean and the Indian Ocean, but they are diametrically opposite. "El Nino" is the Spanish transliteration of "El Nino", which refers to the abnormal temperature of tropical ocean and the continuous warming. "La Nina" is even the antonym of its name, which is the transliteration of Spanish "San", referring to the abnormal temperature and continuous cooling of tropical oceans.

"El Nino" appears irregularly, once every four years on average. In the second year of El Nino, La Nina always happens, sometimes for two or three years.

The influence of La Nina phenomenon includes the unusually dry southwest of the United States and the west coast of South America, the unusually high precipitation in southeast Asia such as Australia, Indonesia, Malaysia and the Philippines, and the extremely cold northeast Asia such as the west coast and southeast coast of Africa, Japan and the Korean Peninsula.

In China, generally speaking, "La Nina" phenomenon will make the northeast monsoon in South China stronger in autumn and winter, and make the winter temperature lower than normal.

Song Shifeng Zhongxin

Nanjing may be colder this winter.

Many citizens feel that autumn in Nanjing this year seems to come overnight, with almost no transition. On September 22 this year, Nanjing officially entered autumn, which is the earliest year since this century. Meteorologists said that this is actually related to the early arrival and high frequency of cold air this year. Around the Mid-Autumn Festival this year, a strong cold air came to our country, and the local temperature dropped 10- 15℃. During the National Day, cold air also frequently visited northern China. The cold air in autumn is coming, will it lead to the advance of winter this year, and will Nanjing be a cold winter this year?

A meteorologist in Nanjing told reporters that it is impossible to predict the cold and warm weather in winter from the intensity of cold air in autumn. The average length of winter in Nanjing is 123 days, and its cold and warm assessment will wait until the end of winter. The Central Meteorological Observatory will predict the long-term climate change, but this should be considered from the whole system of atmospheric circulation, and the strength of cold air in autumn is only one aspect.

However, it is worth noting that this year is the "La Nina" year, and La Nina phenomenon is likely to start from June+10 in 5438, and strengthen and continue in winter. Signs of La Nina are hurricanes, heavy rains and severe cold. Then, if La Nina phenomenon appears, the impact on China is prone to Leng Xia fever in winter, that is, the temperature in winter is lower than normal and the temperature in summer is higher. Therefore, the China Meteorological Bureau has warned that attention should be paid to the possible low temperature phenomenon this winter. Because at the beginning of 2008, under the influence of La Ni? a climate, most areas in southern China suffered from persistent large-scale low temperature, snowstorm and freezing attacks that are rare in history. Therefore, it is not ruled out that it will be cold this winter, and the probability is high.