In China, the weather with the highest daily temperature reaching or exceeding several degrees Celsius is called high temperature weather.

In China, the weather with the highest daily temperature reaching or exceeding 35 degrees Celsius is called high temperature weather.

Hot weather refers to the weather when the daily maximum temperature reaches a certain temperature (or above). The standard of high temperature heat wave recommended by the World Meteorological Organization is that the daily maximum temperature is higher than 32℃ and lasts for more than 3 days. Meteorology in China generally refers to the high temperature when the maximum daily temperature reaches or exceeds 35℃. If the high temperature day lasts for more than 3 days, it is called high temperature heat wave.

The formation of high temperature is often directly caused by a specific weather system, among which the most typical and common is the subtropical high, which is known as the "high temperature messenger"; In addition to natural factors, the formation of high temperature weather is also influenced by human activities. Generally speaking, there are usually two kinds of high temperature, one is dry heat and high temperature with high temperature and low humidity; The other is hot and humid, which is called "sauna day".

Causes of high temperature formation

Although there are different standards for high temperature in different parts of the world, the causes of high temperature weather in different parts of the world are similar. There are mainly the following three aspects:

1, weather system trigger: the formation of high temperature is often directly caused by a specific weather system, and the most typical and common one is the subtropical high, which is known as the "high temperature messenger". In addition to subtropical high, continental warm high pressure, tropical cyclone, hot low pressure, weak cold front and other weather systems will also give birth to high-temperature heat waves.

2. Global warming provides the climate background: Under the influence of global warming, extreme high temperature events become more and more frequent.

3. Urban heat island effect "adding fuel to the fire": Urban heat island effect refers to the phenomenon that the temperature in the city center is higher than that in the suburbs. With the acceleration of urbanization, the urban heat island effect is more obvious, which undoubtedly contributes to the high temperature weather.

Baidu encyclopedia-hot weather