What is the peculiar phenomenon of rain? What are the natural phenomena after the rain

Fish rain, fish fall with the rain because of tornadoes.

There will be a rainbow: because the humidity of the air becomes higher after the rain, and then the sun appears, and the sunlight shines on the water vapor in the air, forming a refraction, and the white light is refracted to be seven colors of light. Rainbows are caused by the emission and refraction of sunlight into water droplets in the sky.

When the sun's light passes through the prism, it is refracted and the white light is broken down into seven color bands: red, orange, yellow, green, blue, indigo, and violet. The sky after the rain is filled with countless small water droplets, which are like a prism, refracting the sun's light into seven colors: red, orange, yellow, green, blue, indigo, and violet, which is why we see rainbows.

Scientific explanation of rainbow formation:

Rainbow is caused by the natural phenomenon of sunlight shining into the sky close to the circle - rainbow (20 photos) shaped small water droplets, causing the dispersion and reflection of light. When sunlight hits a water droplet, it is incident at different angles at the same time, and it is also reflected at different angles within the water droplet.

The reflection is strongest at 40 to 42 degrees, forming the rainbow we see. In this reflection, sunlight enters the water droplet, is refracted once, then reflects on the back of the droplet, and finally refracts again when it leaves the droplet.

Because water has a dispersive effect on light, the refractive index of light of different wavelengths is different, and the refractive angle of blue light is greater than that of red light. Because the light is reflected inside the water droplet, the observer sees the spectrum upside down, with red light at the top and other colors at the bottom.

In fact, as long as there are water droplets in the air and sunlight is shining at a low angle behind the observer, it is possible to produce a rainbow phenomenon that can be observed.

There are a lot of signs that it's going to rain. In nature, some abnormal behaviors of many animals may indicate that it is about to rain, and in addition to some special plant conditions, it may also indicate that it is about to rain. First, ants are moving in groups, which may be a sign of rain.

Second, the swallow flies low to rain, before the rain is humid, the swallow wants to eat the flying insects, the insect wings are not high when the humidity is high, and the swallow can eat the insects when it flies low. Thirdly, it rains when mosquitoes bite people, which is somewhat similar to the principle of swallows flying low. Thirdly, during the day, the snakes are running around and it may rain.

After touching the mimosa on the fourth, the leaves shrink very slowly, without shrinking, and after a long time to open again, it may rain.

1. "Hook clouds in the sky, rain on the ground": hook hook clouds refer to cirrus fishing, behind this kind of cloud, there are often fronts (especially warm fronts), low pressure or low pressure troughs moving, indicating that rain is coming.

2. "Fort clouds, rain": Fort clouds refer to Fort Altocumulus or Fort Stratocumulus clouds, which mostly appear in front of low-pressure troughs, indicating that the air is unstable, and thunderstorms generally fall every 8 10 hours or so.

3. The privet leaves are gone.

The leaves of privet grow as they fall. If the summer season is unusually littering and leaves do not grow (or have very few leaves), it indicates that there will be rainy weather in the next 2 to 3 months.

4. Artemisia annua gives birth to white buds.

Artemisia wildensis is found all over China and is a wild plant of the Asteraceae family with strong drought tolerance. If you find a lot of small white buds growing on its roots during a severe drought weather, it is a sign that it will rain soon.

5. Mimosa "shyness".

Mimosa leaves shrink slowly after being touched, or open as soon as the leaves are slightly closed, indicating that the wind and rain are coming; It closes quickly after being touched, but it takes a long time to recover, indicating that the sun will shine brightly in the future.

6. Xishuangbanna wind and rain flowers.

Before the storm, the outside atmospheric pressure decreases, the weather is hot, the transpiration of plants increases, and the bulbs that store nutrients for the wind and rain flowers produce a large number of hormones that promote flowering, and a large number of flowers will be produced.

The formation of rain is a phenomenon of change in the liquid state of water. Rain disturbance is a natural precipitation phenomenon that is produced by atmospheric circulation disturbances and is an indispensable part of the earth's water cycle. Raindrops fell from the sky, big and small, fast and slow.

Water evaporates on the earth's surface, rises and cools to form rain. Rain is the most important source of freshwater resources for human life.

Main forms: Rain usually comes in four forms:

1. Frontal rain (plum rain): The warm and humid airflow from the ocean meets the cold air from the land, because the cold air is heavy and the warm air is light, the warm and humid airflow is forced to rise, and when it is condensed, it forms a very long and wide rainfall belt, which is the frontal rain.

2. Convective rain: In summer, under the strong sunlight and Li disturbance, the warm and humid air in the local area of Brother Dan rises sharply, and condenses to form rainfall, which is convective rain, which is called "thundershower" in meteorology, usually called "bursting sky", in addition, typhoon rain is also a kind of convective rain.

3. Topographic rain: The warm and humid air flow from the ocean, when it encounters mountains, is forced to rise, and when it encounters condensation, it forms rainfall.

4. Typhoon rain: The hot and humid air over the tropical ocean rotates and rises strongly on a large scale. During the rise, the temperature drops rapidly, and a large amount of water vapor condenses into clouds and rain, which is called typhoon rain.

A rainbow will appear:

Because the humidity of the air becomes higher after rain, and then the sun appears, and the sunlight shines on the water vapor in the air, forming a refraction, and the white light is refracted into seven colors of light.

The ground temperature of the cement road is high, and after the rain, the rainwater absorbs heat on the ground and evaporates, turning into water vapor, and the water vapor temperature is high, and then the air at a lower temperature slightly farther from the ground will liquefy again, and finally turn into smoke.

The rainy season generally refers to the summer season from May to October, which is characterized by a lot of rainfall, a large wet banquet and a high temperature, and often appears rainy and occasionally heavy rain.

First, precipitation has increased;

The second is the rise in temperature: the rainy season marks the end of winter and the arrival of spring.

The third is foggy weather: after the rain solar term, the evaporation of water vapor accelerates, the temperature rises on Jiahuizai, and the atmospheric humidity increases, which is easy to form foggy weather.