How are clouds, rain and snow formed?

When air containing a lot of water vapor rises into the air, the temperature of water vapor decreases, and it liquefies into small water droplets or condenses into small ice crystals. These tiny particles can be carried up by the updraft to form clouds, so clouds are made up of a lot of water vapor and small ice crystals.

Step 2 rain

Composed of water droplets, most of which are more than? 0.5? Millimeter. Cloud plasmids grow through various physical processes. For example, in water clouds, cloud droplets form larger water droplets through condensation and collision. When the water droplets are too big to be supported by updraft, they fall to the ground, which is rainfall. The three elements that form rainfall are water vapor, cooling and concretion.

3. Snow

Clouds are composed of many small water droplets and small ice crystals, and mixed clouds are composed of small ice crystals and supercooled water droplets. When supercooled water droplets collide with ice crystals in mixed clouds, they will freeze and stick to the surface of small ice crystals, making them grow rapidly. When small ice crystals grow up and overcome the resistance and buoyancy of the air, they fall to the ground, which is snowfall.

Extended data

Weather forecast is to predict the weather conditions in a certain period in the future by applying the law of atmospheric change and according to the current and recent weather situation. It is based on the analysis of satellite cloud images and weather maps, combined with the comprehensive study of meteorological data, terrain and seasonal characteristics, and mass experience.

For example, the satellite cloud image of China Central Meteorological Observatory was taken by Fengyun-1 meteorological satellite made in China. Using satellite cloud images for analysis can improve the accuracy of weather forecast. The time limit of weather forecast is usually divided into three types: short-term weather forecast (2 ~ 3 days), medium-term weather forecast (4 ~ 9 days) and long-term weather forecast (10 ~ 15 days or more). CCTV mainly broadcasts short-term weather forecast every day.

The main contents of weather forecast are the future rain, maximum and minimum temperature, wind direction and wind force and special disastrous weather in a region or city. As far as China is concerned, meteorological stations can accurately predict the location and intensity of natural disasters such as cold waves, typhoons and rainstorms, and can directly serve industrial and agricultural production and people's lives.

Weather forecast is based on meteorological observation data, applying the principles and methods of meteorology, dynamic meteorology and statistics to make a qualitative or quantitative forecast of the weather conditions in a certain area or a certain place in the future. This is an important goal of atmospheric science research. It is of great significance to people's lives.

Baidu Encyclopedia-Cloud

Baidu encyclopedia-rain

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