Specifically, this low-temperature freezing disaster in southern China there are two main reasons: First, since last December in favor of high-latitude cold air southward atmospheric circulation anomalies for a long time to maintain, resulting in a nationwide strong cooling stage; the second is affected by La Nina events, the strong side of the East Asian winter monsoon, the South vulnerable to extreme low temperature events, once with warm and humid air, the easy to produce freezing rain and snow disasters.
In addition, this water vapor transport conditions and the cold and warm air meets the conditions worse than in 2008. January 2008, the West Pacific subtropical high power is very strong, cold air will remain in favor of our country, which causes persistent snow and ice weather. This year, over the same period than normal West Pacific subtropical high was weak, unable to stop the stagnation of cold air in southern China.
reporter recently learned from the China Meteorological Administration, in some areas for the current severe weather, the CMA will take extraordinary measures to strengthen the rain and snow conditions, real-time monitoring and disaster impact assessment, attention Freezing weather, short-term forecasting and early warning information published work and carry out emergency preparedness. (Xinhua Zhang Xinxin)
far this year occurred in southern China during the two rain and snow, rain days generally in 4-6 days, in which western Guizhou, Chongqing, western, southeastern Hunan and other places have 6-8 days. Compared with the year, the number of days of above normal rainfall in most areas, western Guizhou Province and other places where the high side for 3-5 days.
Reporter: weather and freezing rain and snow this year compared to 2008, what are the characteristics?
Song Lianchun: Comprehensive analysis and comparison of the South this year, freezing cold weather and the situation in 2008, there are similarities, there are very different.
First, the low temperature range of the South this year, and no precipitation intensity and 2008. National Climate Center under the 2010-2011 winter ocean monitoring and prediction of atmospheric circulation in 2008, the Bay of Bengal and the Indian Ocean's warm and humid air stronger, better moisture conditions, and this year is not sufficient moisture conditions, resulting in China most areas showed
under the National Climate Centre of The Guizhou, Hunan and other places that have appeared cold weather, freezing weather and the future prospects of view, freezing rain appeared earlier this year, but the process appears intermittent, temperature ups and downs, is conducive to ice melt.
expected ,16-21, the China Meteorological Administration, the South snow and ice will once again expand the scope and intensity has been enhanced. Of these, Guizhou, Yunnan, northeast, southeast of Chongqing, Hunan, western and southern, northern Guangxi, Jiangxi Province in central part of the region sleet.
Song Lianchun: We know that since January, in addition to the Tibetan Plateau and the Yunnan, Heilongjiang and other places outside the north, low temperatures in most parts of the country more than 2 ℃, including Guizhou, Hunan, Hubei, 1961, average temperatures were a record a new low since the historical period, the average temperature is lower than 1 ℃ low temperature days for 5.6 days, the most since the same period of 1961.
Song Lianchun: the production of freezing rain requires two conditions: First, relatively strong cold air, resulting in surface temperature and below 0 ℃; followed by warm air to provide water vapor to have to fall as rain.
low temperatures near the ground as rain in the utility poles, trees, vegetation and road surface freezing of the ice layer of translucent crystal, the weather.
Reporter: freezing rain and snow will continue into the spring weather?
the latest Central Meteorological Station forecast, with the cold air to launch a new round of attacks, 16, began to expand again to South freezing range, intensity strengthened.
Secondly, this year the process of cold air south a short interval of time is long, snow and smaller in scope than in 2008. Snow and ice storms in 2008 occurred in January 10 to February 2, affecting the Guizhou, Hunan, Hubei, Anhui, Jiangxi and other 19 provinces (autonomous regions and municipalities), continuous process up to 24 days, which Hunan and Hubei is continuing since 1954, freezing rain and snow weather, the longest of the year.
Reporter: produce freezing rain conditions and the formation of the reason?
step by step as the Spring Festival approaching, the weather back home has become even more subject to people's attention. 16 interview with Xinhua, National Climate Center Song Lianchun, snow and ice on the south stage to resolve disaster on the country during the spring weather was forecasted.
from the currently available means of monitoring point of view, during the spring of 2011, the national annual precipitation than the same period in the whole show too few features, similar in January 2008 a wide range of persistent snow and ice disaster the possibility of small. But most of the low temperature than the same period the year may still periodically strong cooling process.
Here, also suggested that relevant departments should be required to warm cold winter ahead of time allocation and energy reserves of work ahead of time significantly cool weather health emergency preparedness, attention to strong cooling process to prevent potential impact.
Reporter: At present, freezing rain and snow in the south, how?
Song Lianchun: Every year in December to next February is the occurrence of freezing weather in southern China's major periods. From Hunan, Guizhou happened the past 50 years the range of frozen and frozen days of view, the scope and intensity of freezing the whole place was reduced, weakening trend, but the individual years fluctuated very intense.
Guizhou, Hunan, an average elevation of 1,100 meters west around the north vulnerable to cold air and moisture transport from the southwest of the combined effect of ocean surface. When the strong cold air met warm air southward, the cold air, warm air masses as the wedge as the wedge below the near surface temperature dropped to zero degrees Celsius, warm moist air is lifted, and into a cloud To rain.
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