What is the main cause of the ice disaster in Hunan?

Mainly in the past two years, Hunan has carried out water reform, and the water pipes have been replaced by plastic (previously all made of steel). Moreover, many water pipes are exposed, and water meters are naturally outside. I don't know how the water meter is broken, but if it is because of ice, it is abnormal that the exposed water meters without any insulation measures are not broken.

When the temperature is 0 degrees, the water in the pipe will definitely freeze overnight. My family burns a few pots of boiling water to drench it every morning.

Every household has paid a lot of money for water reform. Why is this happening? . . .

The snow and ice came almost without warning.

On New Year's Day holiday, in the warm winter sunshine, some people worry about global warming and abnormal climate. On October 9th, 65438/kloc-0, the highest temperature measured by the provincial meteorological observatory reached 20℃, and the sunshine was as bright as warm spring.

However, on the night of 12, the rain and snow plummeted, and the long-lost snowflake made people very happy, but I didn't expect it to be just a prelude to the big freeze. The ensuing freezing made Hunan people in the south unprepared. What is even more unexpected is that in 10 days, freezing is with us every day. Traffic jams and power shortages have greatly affected people's production and life.

The comprehensive strength of freezing is the strongest since the founding of New China.

If the scenery of "Snow in Wan Li" has also been there, then the scene of "thousands of miles frozen" is absolutely strange in the memory of most Hunan people. From the night of 12, the whole province's mountainous areas and Changsha, Xiangtan, Yiyang, Loudi, Shaoyang and Huaihua were frozen. By the 28th, the duration of the freezing process in the whole province had reached 16 days, and the longest continuous freezing day occurred in 48 counties and cities since local meteorological records. According to meteorological records, the impact of the continuous freezing on the whole province has ranked first since 195 1.

"The comprehensive intensity index of this freezing rain and snow weather process is the strongest since the founding of New China." This is a comprehensive evaluation of the freezing rain and snow weather process by the provincial climate center according to five indicators: freezing occurrence range, freezing duration, freezing intensity, freezing period occurrence range and freezing period duration.

What caused this serious disaster was a beautiful snowball.

At present, the large-scale freezing in our province has caused serious disasters in our province. From the meteorological analysis, it is this beautiful rain.

Rain, wrapped in vegetation, blooms beautiful ice flowers; Hanging on a tree, weaving a long bead curtain; Sprinkle it on the cement pavement and spread beautiful glass. However, it was a severe and disastrous weather.

Ye Chengzhi, chief forecaster of the Provincial Meteorological Observatory, said that if supercooled raindrops or Mao Mao raindrops freeze on objects (the temperature is lower than 0℃), they will form rime, commonly known as "hanging trees", which is also called freezing rain when ice and trees condense. Yu Shu, also known as "Tung Oil Coagulation", is extremely difficult to eradicate and extremely destructive.

Why is there a rainy season in my provincial capital? She analyzed that the formation of rime requires three special conditions, and our province has just met these conditions in recent times. First, favorable precipitation conditions. Compared with previous years when a single continental high pressure controlled our province, this year, the southwest warm and humid airflow is super strong, and it meets the northeast airflow for a long time over our province, which has the precipitation conditions caused by continuous rainy weather. Second, the ground temperature has been below 0℃ for a long time. Since the first ten days of June, 5438+10, our province has been at the bottom of the strong Mongolian high pressure, and the ground has been supplemented by cold air from east to south, resulting in continuous low-temperature weather, and the ground temperature is lower than 0℃, forming a deep cold underlying surface conducive to strong freezing. Third, favorable inversion stratification conditions. The surface air temperature is lower than 0℃, and the warm air above 0℃ flows northward from 1500m to 3000m, forming a warm air layer or clouds. Above 3000m, there is an upper atmosphere with a temperature lower than 0℃, and the temperature of clouds is often lower than-10℃. The vertical structure of the atmosphere is cold up and down and warm in the middle, that is, there is an inversion layer near the ground.

The atmosphere is divided into ice crystal layer, warm layer and cold layer from top to bottom. In this way, snowflakes falling from the ice crystal layer melt into raindrops when passing through the warm layer, and then enter the cold air layer near the ground, and the raindrops quickly cool down and become supercooled raindrops. When it falls to the ground, branches, wires and other objects whose temperature is lower than 0℃, it gathers and spreads on the surface of the object, immediately freezes and forms rime.