Is it always windy before it rains?

Not necessarily, there are two cases: 1 is due to 2 clouds with different temperatures and humidity"Collisions"Raindrops are produced 2 because the warm and humid air flow rises and condenses into small water droplets when it encounters cold air, which is rain The first situation is that there is no wind, and the second is windy.

It doesn't have to be windy, and the rain is related to the temperature of the clouds. The movement of air is responsible for the formation of wind. Therefore, there is no necessary connection between the two.

Usually it should be. Because rain is mostly formed due to the meeting of cold air and warm and moist air currents, it often causes changes in air pressure at this time. Especially during thunderstorms, this process is more intense, so it is often windy. There is always wind.

Right. It depends on how strong it blows. Sometimes we don't feel it. But there is still rain, in layman's terms, due to 2 clouds with different temperatures and humidity"Collisions"generated. Just like that, let's read the geography book of the first year of high school.

According to the influence of convective movement on rainfall, rainfall can be divided into four types: cyclonic rain, topographic rain, convective rain, and typhoon rain.

1) Cyclonic rain. The rainfall that occurs with the passage of a cyclone or low pressure is called cyclonic rain, and it is one of the important weather systems for seasonal rainfall in China. Cyclonic rain can be divided into two types: non-frontal rain and frontal rain.

Non-frontal cyclonic rain is caused by the convergence of airflow towards low pressure and the airflow is caused by the rise of airflow, which is generated by frontal cyclonic waves. A cyclonic wave is a type of frontal fluctuation in the lower atmosphere. Cyclonic waves occur in temperate regions, so they are called extratropical cyclonic waves, and cyclones are formed when cyclonic waves develop to a certain depth.

The Yangtze-Huaihe cyclone is a frontal cyclone that occurs in the Yangtze-Huaihe River basin and the Hunan and Jiangxi regions, which occurs more frequently in spring and summer, especially in June and July during the plum rainy season, and is one of the important weather systems that cause heavy rain in the Yangtze-Huaihe region.

Most of our country is temperate, belonging to the intersection of the north and south airflows, and the cyclone rain is extremely developed. The proportion of cyclonic rain is more than 60% in all places, more than 80% in central and northern China, and 70% even in the northwest inland. Most of the cyclones in China occur in the areas east of the plateau.

In the north, there are the Mongolian cyclone, the northeast depression and the Yellow River cyclone. After the formation of cyclones in China, they generally move northeast to the sea, and the famous plum rain in the south of the Yangtze River is caused by the intersection of the polar air mass and the tropical ocean air mass in the south of the Yangtze River in June and July.

2) Terrain rain. When the moist air mass advances, it encounters a high mountain block, and the air flow is forced to rise slowly, causing adiabatic cooling and condensation, and the rain thus formed is called topographic rain. Most of the topographic rain falls on the windward slopes, while the leeward slopes are adiabatic warming caused by air subsidence, which reduces cloud cover and rainfall.

Topographic rain tends to increase with the height of the terrain. Terrain rain is generally not very strong if it is not combined with convective rain or cyclonic rain.

3) Convective rain. When the ground is heated, the air near the ground becomes warmer and less dense, so convection occurs, and if the air is humid, the rising air flow will produce heavy rain or accompanied by thunder and lightning, which is called convective rain. Convective rain mostly occurs in summer, develops quickly, lasts for a short time, and does not account for a large proportion of annual precipitation.

4) Typhoon rain. A typhoon rain is rain brought by a storm over a tropical ocean. These storms are composed of unusually strong oceanic hot and humid air masses, and the torrential rain that can reach hundreds of millimeters at a time can sometimes reach more than 1,000 millimeters, which is very prone to disasters.

In summary, non-frontal rain in cyclonic rain will produce light winds, while frontal rain will have strong winds. Topographic rain may have light or no wind, convective rain is generally windless, and typhoon rain is ......Needless to say.

Everyone knows that a thunderstorm is often preceded by a gust of wind followed by a shower, which is more common in mountainous areas. Why is it windy before a thunderstorm and then raining?

The reason is that in the hot summer, the air near the surface warms up violently, and under the influence of a favorable weather system, the warm and moist air is particularly strong. Especially when the horizontal airflow is blocked by mountains and highlands, on the one hand, due to the strong uplift of the terrain, the warm and moist air rises along the mountain slopes. On the other hand, mountains have a heating effect on the air near the surface, causing the air to expand and rise, and it is easy to form thunderstorm clouds. Therefore, in thunderstorm clouds, there are both strong updrafts and downdrafts.

When the cold air that sinks from the thundercloud reaches the ground, it quickly spreads around, forming a pile of cold air. Due to the greater density of the sinking cold air, the air pressure of the cold air stack rises rapidly, forming a cold high pressure called thunderstorm high pressure. As a result, a large air pressure difference occurs in a small area, and the wind blows.

When the wind pours from the center of the thunderstorm high pressure to the surrounding ground, the speed will increase suddenly, usually up to more than 10 meters per second, and sometimes more than 30 meters per second.

After a gust of wind, a thunderstorm arrives quickly, followed by a depression that produces precipitation, and then a thunderstorm occurs. Therefore, high winds often precede thunderstorms.

However, not all thunderstorms are preceded by strong winds. Sometimes fierce winds and thunderstorms strike at the same time; Sometimes thunderstorm clouds that fill the sky only rain and do not blow strong winds. This is because for a certain thunderstorm, there are exceptions due to the different specific time, place and conditions of the thunderstorm, plus some of its own characteristics.

1. The wind direction is directly related to the local topography and season, the rain is relatively long when the south wind, southeast wind and east wind blow in summer, and the rain is more urgent when the north wind blows, but the time is short, and the west wind is generally not easy to rain, because there is not enough water vapor transport in the western part of our country. In fact, weather forecasting is very complex and there is no specific rule.

2. Rain is a natural scene, which is when the water on the earth is irradiated by the sun's rays, 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 is a folk proverb that "the wind is in the rain", which means that after a strong gust of wind, it often rains heavily.

In summer, there is a lot of water vapor in the air, and under the impetus of the high temperature of the ground, the air expands and rises upward, and it is easy to form a very thick cumulonimbus cloud at high altitude, and then it rains. Cumulonimbus clouds are clouds with strong upward and cold air currents. When the cold air reaches the ground, due to the high density of the cold air, a cold high pressure will be formed on the ground, forming a strong pressure difference with the surrounding warm air.

In this way, cold air flows rapidly from the high-pressure area to the low-pressure area, forming a strong wind. When the gale passed, the cumulonimbus clouds were over us, and it began to rain.

The reason why it is windy first and then rainy is that when the warm and humid air meets the cold air, it condenses and forms clouds, and the water vapor in the clouds gradually gathers to form water droplets that are larger than loose oranges, and when the water droplets are large enough, they will fall from the clouds to form rain. The wind blows because before the arrival of cold air, the movement of warm and humid air currents is affected by factors such as topography and air pressure, which leads to changes in the distribution of air currents, thus forming wind. The specific process is as follows:

Preparation: Water vapor in the sky gradually gathers to form clouds, and the warm and humid air currents are replaced by cold air, when the water droplets in the clouds are not large enough to fall.

Windy phase: With the continuous influx of cold air, the distribution of warm and humid airflow is affected, resulting in uneven distribution of airflow and the formation of wind.

Rain phase: Due to the continuous accumulation and increase of water droplets in the clouds, finally Dazhaotan reaches the tipping point of falling, and it begins to rain.

In conclusion, the reason why the wind blows first and then rains is that the warm and moist air flow meets the cold air, and the water vapor gradually gathers to form clouds, and as the water droplets continue to gather, eventually the raindrops form and start to rain, while the reason for the formation of the wind in front is the change in the distribution of the air flow.

The reason why it is windy and then rainy is that the heat is unevenly distributed in the weather, resulting in the formation of some regional unstable air masses in the air and water vapour. When these air masses move through the atmosphere, they trigger strong winds and emit more water vapor, and then the sky starts to get gloomy and eventually it rains.

In addition, there is also a situation where it may appear to be windy and then rainy, but in fact it is because people are indoors, and Xunsheng does not realize that it has started to rain outside. When it rains, it is known that the celery is very small or due to the direction of the wind, and when the raindrops fall and grow old, they will be blown by the wind and fall obliquely on the ground, as if "the wind blows first and then it rains".

There is a lot of water vapor in the air, driven by the high temperature of the ground, the air expands upwards and rises, it is easy to form a very thick cumulonimbus cloud at high altitude, the cumulonimbus cloud is a cloud cluster, there is a strong upward warm old air flow and a strong descending cold air flow, when the cold air reaches the ground, due to the high density, it will form a high cold pressure on the ground, and form a strong air pressure difference with the surrounding warm air, so that the cold air quickly rises from the high pressure area to the low pressure area, forming a strong wind, and the cumulonimbus cloud has come down after the gale. And it started to rain.

Hello dear, the reason is that in the hot summer, the air near the ground warms up violently, and under the influence of a favorable weather system, the warm and humid air is particularly strong.

There are times when it is windy on a sunny day.