What are the natural phenomena before the rain? What are the natural phenomena before the rain

Looking at the clouds, the thick clouds will be dark, basically cumulonimbus clouds, and wind, and it will generally blow before it rains.

There are dark clouds, or it is very muggy.

Various natural phenomena before the rain.

1. Sky: The air humidity increases, the air pressure decreases, the sky is dark, the clouds are thick, and sometimes there will be thunder, lightning and wind.

2. Ants will move: Ants who dig holes in the ground to live will feel that the hole will be flooded if it rains, that is, they will flee before the rain.

3. Flying insects fly low: before the rain comes, the air humidity will increase greatly, the air pressure will also decrease significantly, the water in the air will condense on their wings, the wings will become heavy, and the swallows will fly low to catch insects.

3. Small fish will float to the surface to breathe: the air pressure in the water is low, and the oxygen dissolution is less, and the fish will float to the surface to breathe.

4. Earthworms out of holes: The ground is wet and soft, and earthworms will crawl out of the ground, indicating that it will rain.

When it rains, the humidity of the air becomes larger, the air pressure decreases, the sky is dark, the clouds are thick, and sometimes there will be thunder, lightning and wind, and the phenomenon of animals will move, frogs will chirp, and earthworms will come out of their holes.

When water on Earth is irradiated by sunlight, it becomes water vapor and evaporates into the air. When water vapour meets cold air at high altitude, it condenses into small water droplets. These small droplets are small, with a diameter of only millimeters and a maximum of millimeters.

They are small and light, held in the air by updrafts in the air. It was these small droplets of water that gathered together in the air to form clouds. For these small droplets to fall to the ground as raindrops, they would have to increase in size by more than 1 million times.

There are generally four natural phenomena that occur before rain, namely: thunder, lightning, wind, dark clouds, etc.

1. Thunder. Thunder is a natural phenomenon in which clouds in the sky are either positive and negative during or before rain. When two clouds collide, lightning strikes, and at the same time emits a lot of heat, heating and expanding the surrounding air.

The air that is heated and expanded in an instant will push the surrounding air, causing a strong **-type vibration. This is thunder.

2. Lightning. Lightning is a phenomenon of intense electrical discharge between clouds, between clouds and ground, or between parts of the cloud body (usually in cumulonimbus clouds). Usually storm clouds (cumulonimbus clouds) produce electric charges, with yin electricity at the bottom and yang electricity at the top, and also a positive charge on the ground, which follows the clouds like a shadow.

3. Windy. Wind blowing is due to the uneven distribution of air pressure in the horizontal direction, and the horizontal component of the horizontal movement of the unevenly distributed air, including direction and magnitude, i.e., wind direction and wind speed. In terms of flight, it also includes the vertical motion component, the so-called vertical or ascending airflow.

4. Dark clouds. Dark clouds are clouds that change color after the fog droplets condensed by saturated steam and supersaturated steam in white clouds become larger and larger. There are many types of dark clouds, such as stratiform clouds that fill the sky, isolated cumuliform clouds, and undulating clouds.

<>1. Sky: air humidity.

As it gets bigger, the air pressure decreases, the sky is dark, the clouds are thick, and sometimes there are thunder, lightning, and wind.

2. Flying insects fly low: Generally, before the rain comes, the air humidity will be very high, the air pressure will also decrease, the moisture in the air will condense on their wings, and the wings of insects will become heavy, so they will not fly high before the rain.

3. Swallows fly low: There is a folk saying that "swallows fly low to make it rain". This is because flying insects in the air do not fly high, and swallows have to eat flying insects, so they also fly low.

In addition, some small insects in the soil also crawl out of the soil, and swallows will also fly low to catch reptiles to eat. Dragonflies, like swallows, have to rain if they fly low.

4. Small fish float to the surface of the water to breathe: the air pressure at the bottom of the water is low.

Oxygen dissolves less, so the small fish float to the surface of the water to breathe.

5. Snake aisle: Most snakes hide in the cave during the day, and go out at night to forage, drink, bathe, molt and other activities. However, when the weather is particularly humid and muggy, it will also force the hole out. Therefore, the snake coming out of the burrow during the day is a sign of rain.

6. Chickens are slow to enter the nest: chickens do not have sweat glands and sebaceous glands.

Due to the lack of heat dissipation ability, it is very afraid of heat. Before the rain, the coop is more stuffy, so the chickens are found to be reluctant to enter the coop, which is a sign that a thunderstorm is coming.

7. Earthworms. Out of the hole: The ground is wet and soft, and earthworms will crawl out of the ground, indicating that it is going to rain.

8. The clear turns to cloudy, and the cicada does not call: The call of the cicada is made by the vibration of the membrane of its abdominal articulator. In summer, about 2 hours before the rain turns to the eye, the cicadas call, and the sky is sunny.

When it turns cloudy, the cicadas do not call.

1. Flying insects fly low---Generally, before the rain comes, the air humidity will increase greatly, and the air pressure will also decrease significantly, the water in the air will condense on their wings, and the wings of insects will become heavy), and swallows will fly low to catch insects.

2. Ants will move: Ants who dig holes in the ground to live will feel that the hole will be flooded if it rains, that is, they will flee before the rain.

3. Small fish will float to the surface to breathe ---the air pressure in the water is low and oxygen is dissolved).

4. Earthworms out of holes: The ground is wet and soft, and earthworms will crawl out of the ground, indicating that it will rain.

Generally, before the rain comes, the air humidity will increase greatly, and the air pressure will also decrease significantly, so there are flying insects flying low (water on their wings), small fish floating on the surface of the water (low air pressure, less oxygen dissolving) and other phenomena, and even some sensitive people feel it before the rain.

The wind is strong, the dark clouds are thick, the lightning is thundering, the sand is flying, the branches are broken, the flowers are falling, and the chickens and dogs are jumping.

Generally speaking, the natural phenomena before the rain include: 1. The weather becomes cooler: due to the decrease in temperature and the increase in humidity, it often rains lightly or carries bad signs of thunderstorms.

2. The wind becomes mild: When the precipitation is coming, the air humidity will increase, so the wind becomes mild. 3. Rising clouds:

Due to the increase in air humidity, a large amount of water vapor gathers together to form clouds, and because these clouds have a large weight, the water vapor in the air forms an upward draft. 4. Strong lightning: A large amount of water vapor forms a condensation in the sky to form rain, and the air layer between the clouds is relatively thin, so the air pressure will not be too great, and strong lightning is emitted in the air.

5. Observation of continuously increasing precipitation: Precipitation is a continuous process, and condensed water vapor will fall from the sky and continue to increase, resulting in a continuous increase in precipitation. In addition, there are other natural phenomena that may occur before the rain, such as:

1. Formation of fog: When the temperature becomes low and the humidity rises, a large amount of water vapor will be released from the air to form a fog, so that the air becomes layered and presents a multi-layered state. 2. Become dark:

When it rains, the sky becomes very dark and darker than usual due to the greatly reduced solar radiation, especially the dense clouds. 3. Moist surface: Before rain, the amount of air moisture evaporation will become larger than that of Bu Ming, so that the outside air will be moist, so that the surface moisture will also be greatly increased.