Why is the temperature in Shanghai so high this year?

The hot weather in Shanghai this year began on July 5, which came late, but the starting point was very high. On July 2 1 day 13: 59, the temperature at Shanghai Xujiahui Station reached 40.9℃, a record high. Shanghai issued the first high-temperature red warning this year at noon today.

Why is the temperature in Shanghai so high this year?

Since the beginning of July, the subtropical high has been relatively stable, the number of typhoons is less than in previous years, and the impact of typhoons is less; The southwest wind that has been blowing frequently recently also helps to warm the ground. These factors led to the hot weather this year.

It is still possible to issue a high temperature red warning between July 2 1 and July 24.

The red warning of high temperature has a great influence on outdoor workers. Once issued, outdoor work will stop except in special industries!

The temperature in Shanghai is so high, why not artificial rainfall?

To be exact, artificial rainfall should be artificial precipitation enhancement, but it is not "rain produced out of thin air" and must be supported by certain conditions. Its weather conditions mainly depend on the supercooled water content and ice crystal concentration in the cloud. Generally, it is required that the stratiform cloud is thicker than 1.7 km and the cumulus cloud is 6-8 km high before operation.

The subtropical high is near the center, so it is impossible to borrow rain on a cloudless sunny day in Wan Li. In addition, there are still uncertainties in the current artificial precipitation enhancement technology itself. If the judgment is wrong and the execution is improper, it may be counterproductive.

Artificial precipitation enhancement should also consider the safety of urban operations. Shanghai has a small area, developed aviation and many tall buildings, so the safety factors to be considered are even more important.