China News Service, Beijing, July 15th. In the past few days, many places in the south have continued to have high temperatures, and the "stove" mode has extremely long standby time. According to reports, many people in Zhejiang, Sichuan, Henan and other places have been diagnosed with heat stroke , and there have even been deaths.
What exactly is heat stroke? How severe is this round of hot weather? How long will it stay hot?
Many places have issued high temperature warnings
How hot will it be this summer?
- The period of high temperature exceeds 30 days, and 71 weather stations have exceeded the historical extreme value
According to the monitoring of National Climate Center , since June this year (as of July 12), the average number of high temperature days in my country has been 5.3 days, which is higher than the same period in normal years. The increase was 2.4 days, the most during the same period in history since 1961.
htmlSince June 13, my country has experienced the first regional high-temperature weather process this year, which is wide in scope, long in duration, highly extreme, and has a large impact. As of July 12, the high temperature event has lasted for 30 days, covering a land area of 5.021 million square kilometers and affecting a population of more than 900 million people.
Distribution of high temperature days across the country from June 1 to July 12, 2022 (unit: day)
The highest temperatures at 71 national weather stations across the country exceeded historical extreme values, among which Hebei Lingshou (44.2℃) and Gaocheng (44.1℃ ), Zhengding (44.0℃) and Yanjin, Yunnan (44.0℃) have the highest daily temperatures above 44℃.
Looking at the near future, on July 13, widespread high temperature weather occurred in the south, including parts of eastern Sichuan, Chongqing, southeastern Shaanxi, western Hubei, southern Anhui, southern Jiangsu, Shanghai, Zhejiang, northeastern Jiangxi, and central and northern Fujian. The highest temperature reached 38~41℃, with Gulin, Sichuan reaching 42.6℃.
On July 14, Zhejiang, Chongqing, Yunnan, Jiangsu and other places issued more than 70 high temperature red warnings.
Why do high temperature heat waves occur frequently?
- Global warming , Atmospheric circulation anomalies, La Niña events
The World Meteorological Organization (WMO) recently announced that according to data from the European Copernicus Climate Change Service, the world has just experienced the third hottest climate on record. June, and saw widespread extreme heat events.
Meteorological experts analyzed that global warming is the climate background for frequent high-temperature and heat wave events in the northern hemisphere, and abnormal atmospheric circulation is the direct cause of frequent high-temperature and heat wave events in many places around the world since June.
Specific to our country, the ongoing La Niña event has provided important climate background conditions for the occurrence and development of high temperatures in the south since June this year. Especially in July, the development of the warm high-pressure belt in the mid-latitudes has strengthened, resulting in a wide range of high temperature weather. .
It is understood that since the beginning of the 21st century, typical years of large-scale sustained high temperature events in my country include 2003, 2013, 2017, etc. Overall, this year's high temperature event started earlier than the above three years, and its duration and number of historical extreme stations are currently less than those in these three years. Although the scope of impact and the maximum temperature at a single station are not as good as 2017, they have exceeded 2003. and 2013.
html On July 10, pedestrians walked under the scorching sun in Minhang District, Shanghai. Photo by Xinhua News Agency reporter Liu Ying
How long will the high temperature weather last?
- There will be more high temperatures and less rain in the southern region in the next ten days
According to the Central Meteorological Observatory forecast, since July 6, the Central Meteorological Observatory has issued high temperature warnings for 9 consecutive days. It is expected that the high temperature, sunny and hot weather will continue in the eastern Sichuan Basin, Jianghuai, Jianghan, Jiangnan, South China and other places until the 17th. The daily maximum temperature in most areas is generally 35~38℃, and it can reach more than 40℃ in some places.
The Central Meteorological Observatory predicts that the national high temperature will be
7-20 on July 14. Rainfall will occur in the Sichuan Basin, Jianghan, Jianghuai, western and northern Jiangnan along the Yangtze River, and northwest South China. The high temperature weather will be alleviated, and the southeastern Jiangnan and eastern South China will continue. Hot and muggy weather.
html After the 121st, the high temperature in the southern region will develop again and the scope will expand. The daily maximum temperature in Fujian, Jiangxi, southern Zhejiang and other places can reach 39~41℃.
On July 7, the temperature of a delivery man’s helmet in Xi’an reached 47.2℃
What exactly is heat stroke?
——Severe heat stroke, which can be life-threatening
According to the "Chinese Expert Consensus on the Diagnosis and Treatment of Heat Stroke", "heat stroke" is a fatal disease caused by thermal damage factors acting on the body. It is caused by exposure to a hot environment or violent An imbalance between heat production and heat dissipation in the body caused by exercise.
When the temperature is too high, the water and electrolyte balance in the human body will be destroyed, causing dizziness, chest tightness and a series of physical discomforts. This situation is called heat stroke. The classification of "heat stroke" in heat stroke is severe heat stroke.
Heat stroke usually occurs in summer when high temperatures are accompanied by high humidity. It usually manifests as high fever, body temperature above 40°C, dry and hot skin without sweating, mental disorder, organ failure, etc. Without timely and proper treatment, the mortality rate of heat stroke ranges from 20% to 70%, and can be as high as 80% for patients over 50 years old.
Who is prone to heat stroke?
——The elderly, children, and outdoor workers should pay attention to
There are two main groups of people who need to prevent heat stroke. One type is mainly caused by the imbalance of heat production and heat dissipation in the body caused by high-intensity physical activity. It is common in healthy young people who exercise strenuously in summer, such as officers and soldiers, athletes, firefighters, construction workers, etc. who participate in summer training.
Another type is common in young people, pregnant women, the elderly and infirm, or individuals with chronic underlying diseases or compromised immune function. It is usually caused by passive exposure to a thermal environment, causing an imbalance between the body's heat production and heat dissipation.
Experts remind that for heat stroke, prevention is very important. Avoid going out during high-temperature periods, increase ventilation, maintain a suitable room temperature, and take protective measures when exposed to direct sunlight for long periods of time. In a high temperature and high humidity environment, if symptoms of heat stroke such as rapid heartbeat, dizziness, headache, shortness of breath, etc. occur, you should move to a cool and ventilated place to rest as soon as possible.
Source: Global Network Information
