It rains and the sun shines at the same time. How is this weather formed？
On a summer day, the doll’s face changed just now, but it was sunny in Wan Li for a while. At this time, someone exclaimed that there was a "solar rain". At that time, the WeChat circle of friends was screened by a rare solar rain. Solar rain is a wonderful natural phenomenon that almost everyone has encountered, but have you ever wondered why this happened?
What is sun rain?
The phenomenon of "solar rain" is a weather phenomenon, which is called "discontinuity of horizontal distribution of precipitation" in meteorology. Solar rain usually occurs in summer, and it is more common in the south.
How is the solar rain formed?
First kind
The reason for the formation is that the rain generated by dark clouds in the distance is instantly blown to another place by high-altitude strong winds.
the second type
It is because two clouds with different charges collide with each other in the high altitude under the action of the solar wind, resulting in excessive water vapor content in the air in some areas, and the water vapor evaporates quickly due to solar radiation.
The third kind
The reason is that the weather suddenly changed and it began to rain. Before the rain from the sky landed, the clouds had disappeared, so although the weather looked sunny, it began to rain.
With rain, the sky stage is lively, and the blue sky is not so boring. We all know the formation of rain, and cloud is one of the most indispensable basic conditions. In fact, it takes a rather complicated physical process to change from cloud to rain!
Formation process of rain
Let’s look at the composition of clouds. Clouds are made up of a large number of invisible water droplets or ice crystals floating in the air, or a mixture of water droplets and ice crystals. From cloud to rain, it is actually a process in which water droplets or ice crystals grow and grow. Whether the cloud drops come down from the cloud after becoming larger is rain, snow or other forms, which mainly depends on the temperature inside and under the cloud. When the temperature in the cloud is above zero degrees Celsius, the cloud is completely composed of water droplets, and when the water droplets increase, they fall down, which is rain.Rain usually appears in four forms:
Types of rain
convectional rain
When the air is strongly heated, the hot and humid air expands and rises, and the rain formed by the cooling and condensation of water vapor in the air is called convective rain. The equatorial region is dominated by convective rain all year round, and the convective rain in our country is more common in summer afternoons.
orographic rain
Orographic precipitation was forced to climb along the hillside because the humid air was blocked by the mountain. In the process of rising, the water in the air cools and condenses to form precipitation. Such as precipitation in northeast India and southeast Tibet in China.
frontal rain
Two kinds of airflow with different properties meet, and the interface between them is called front. On the front, warm, wet and lighter air is lifted to the cold, dry and heavier air. In the process of uplift, the water vapor in the air cools and condenses, and the precipitation formed is called frontal rain.
Typhoon rain
Rainfall is a special form of rainfall, which usually occurs when a typhoon comes. The center wind force of a typhoon is generally very strong, and the maximum wind force can reach more than 12! The time of rainfall generally depends on the speed of typhoon movement, and the rainfall intensity is very large in a short time, accompanied by strong lightning and strong winds.
Source | Meteorology E New
