What are the cold wave measures and what are the hazards of the cold wave?

Lead: Cold wave is the highest level of cold air. Once it reaches the highest level, it will bring a lot of harm to our lives. What are the hazards of the cold wave? When the cold wave comes, the heavy snow will continue, roads will be covered with thick snow, which will affect traffic and crops will freeze to death. What defensive measures do we have in the face of these cold waves? A cold wave is coming in China recently. Let's take precautions together.

What are the hazards of the cold wave? Harm of cold wave and its preventive measures

cold wave

1. What are the hazards of cold wave?

The cold wave refers to a disastrous weather process in which the strong cold air in the north of China presses southward in a large range like a tide, resulting in a sharp drop in temperature in a large range. It is a serious disastrous weather. But not every time cold air goes south, it is called a cold wave. According to the regulations of China's meteorological department, whenever cold air invades, the temperature drop in one day is above 10℃ and the local minimum temperature is below 5℃, which can be called a cold wave.

Severe weather such as severe cold, strong wind and frost brought by the cold wave will adversely affect industrial and agricultural production and people's lives. When the cold wave brings frost, the temperature will drop below 0℃, and the water in plant cell gaps will freeze. When water freezes, its volume will increase, which will produce a kind of pressure, so that the water in the cells will continue to penetrate outwards, resulting in dehydration of cells and partial withering or complete death of plants.

Farmers in China have accumulated rich experience in defending against cold wave and frost. For example, before frost occurs, methods such as smoking, irrigation and mulching should be used to increase the temperature of farmland and soil to reduce the harm of frost to crops.

Cold wave and strong cold air usually bring strong winds, and cooling weather is the main meteorological disaster in winter half a year in China. Cold wave and strong wind are the enemy of marine fishery production; Sandstorms, sandstorms and snowstorms often occur in northwest China, which have caused serious harm to animal husbandry, agriculture and transportation. In the cold season, strong winds often aggravate the freezing injury. As the saying goes, "the weather is cold and cold" refers to cold waves and strong winds. Strong cooling and severe cold can freeze the eggs of overwintering bacteria and purify the air, which is beneficial, but it also often causes freezing damage to some crops, fruit trees and vegetables. The sudden drop in temperature can easily lead to cerebral hemorrhage and recurrence of heart disease in the elderly. For example, at the end of 1987+ 165438 10, a cold wave broke out, and there was strong wind and cooling weather from north to south in China, and the daily average process cooling in most areas reached 10-20? C, local areas are accompanied by northerly winds of grades 5-6 and 8-9. Rain and snow weather also occurred, and wheat and rape in Jiangsu, Anhui, Hubei, Shandong and other provinces suffered from freezing damage. According to reports, 50 million mu of wheat and rape in Jiangsu Province suffered from different degrees of freezing injury; In Anhui province, all direct-seeded rapeseed in some areas froze to death. Vegetables such as Chinese cabbage in Guanzhong, Hebei, Jiangsu and other places were severely frozen; Subtropical crops such as vegetables, bananas and pineapples in Guangdong and Guangxi also suffered from different degrees of freezing injury. The cold wave brings rain, snow and freezing weather, which has a great impact on traffic. Many railway stations in Harbin, Shenyang, Beijing, Urumqi and other places were frozen, tracks were buried by snow, communication signals failed, and train operation was blocked. After the rain and snow, the road surface freezes and slips, which makes the traffic accidents increase obviously.

cold wave

Second, the cold wave defense measures

1. When the temperature drops suddenly, pay attention to add clothes to keep warm, especially the hands and face.

2. Close the doors and windows and fix the outdoor structure.

Be careful when you go out.

4. The old, the weak, the sick and the disabled, especially those who are sensitive to temperature changes such as cardiovascular patients and asthma patients, should try not to go out.

5. Pay attention to rest and don't be too tired.

6. Beware of gas poisoning, especially for families that use coal stoves for heating.

7, should strengthen the weather forecast, release accurate cold wave news or alarm in advance.

8. Issue accurate cold wave news or emergency report, so that ships at sea can return in time.

9. Prepare crops and herds for cold protection in advance.