Is it raining in Shanghai now?

As of 9: 00 on October 9, 2020/KLOC-0, there was light rain in Shanghai today, the temperature was 7 degrees, and the air quality was good.

The specific temperature is as follows:

Shanghai was rated as "the first-tier city in the world" by the GaWC 20 18 world city system ranking. In the comprehensive ranking of global cities released by Kearney in 20 19, Shanghai ranked 19 in the world, and China ranked third. In the 20 19 Global Urban Business Environment Index and Top 100 Cities, Shanghai ranks 48th in the world and 4th in China. On 2019101October 3 1 day, Shanghai was selected as the first batch of 5G commercial cities.

Extended data:

Rainfall mechanism

There are many reasons for the rain, and the manifestations are unique, including Mao Mao rain, continuous rain and pouring rain. After the water on the earth is irradiated by sunlight, it becomes steam and is evaporated into the air. Water vapor condenses into small water droplets when it meets cold air at high altitude. These water droplets are very small, with a diameter of only 0.0 1 ~ 0.02 mm and a maximum of only 0.2 mm. ..

They are small and light, and they are held in the air by the updraft in the air. It is these small water droplets that gather in the air to form clouds. These small water droplets will become raindrops and fall to the ground, and the volume will increase by about 1 10,000 times. It mainly relies on two means, one is condensation and sublimation. The second is to rely on the collision and increase of cloud droplets.

In the initial stage of raindrop formation, cloud droplets mainly condense and condense themselves by constantly absorbing water vapor around the cloud. If the water vapor in the cloud can be constantly replenished and replenished, so that the surface of the cloud droplets is often in a state of supersaturation, then this condensation process will continue, making the cloud droplets grow and become raindrops.

However, sometimes the water vapor content in the cloud is limited, and in the same cloud, the water vapor is often in short supply, so it is impossible to make every cloud droplet grow into a larger raindrop, and some smaller cloud droplets have to be merged into a larger cloud droplet. If there are water droplets and ice crystals in the cloud, the process of condensation and sublimation will be greatly accelerated.

When the cloud drops increase to a certain extent, due to the increasing volume and weight of large cloud drops, they can not only catch up with the slower small cloud drops, but also "swallow" more small cloud drops, making themselves stronger. When the big cloud drops get bigger and bigger until the air can no longer hold them, they fall straight from the clouds to the ground and become our common rain.

China Meteorological Observatory-Shanghai Weather