Why is it so hot in Shanghai?

The main reason is that the warm and humid air flow from the southern sea area is equivalent to the cold air mass in the north, which has been sawing for a long time and formed a large-scale frontal rainfall weather process.

On the one hand, the threat of subtropical high in the western Pacific is fierce.

It has been detected in many places along the southeast coast and east coast of China.

On the other hand, the Iranian high pressure in North Africa and the South Asian high pressure are also fierce this year.

Due to the high temperature in South Asia, West Asia and North Africa, it provided a good and rich heat source for the formation, development, maintenance and northward movement of the two high pressures.

In the process of the South Asian High moving northward, the subtropical high in the southeast of China was influenced by its combination, and it moved northward earlier this year, basically more than half a month earlier than in previous years, so it was strongly "squeezed" to form a front in the rainy season.

In the northward control area of subtropical high, high altitude effectively blocked the cold vortex air mass in the north, so the rainy season in previous years ended ahead of schedule and entered a relatively dry and muggy summer drought weather.

Tips for preventing heatstroke

1. Drink water: drink slowly when you drink, and don't drink hard when you are thirsty; Drink warm water instead of ice water; Drink water regularly, don't wait until you are thirsty; Drink boiled water instead of raw water; Drink fresh warm water instead of "old" water; You can also drink more warm water with light salt.

2. Drink some diluted electrolyte drinks: stay away from alcohol, caffeine and cigarettes.

3. Adapt to the change of temperature slowly: When engaging in outdoor activities, slow down and don't try to be brave.

4. Heat dissipation in time: When it is too hot, use cold water to shower the head and neck to let the water evaporate and help dissipate heat.

5. Pay attention to weight changes: heatstroke may cause the body to gradually collapse within a few days, so if there is a sudden drop in weight within a few days, you should pay attention.