What are the grades of rainstorm?

What are the grades of rainstorm? In life, we will get early warning from the state before all kinds of disasters come. There are many kinds of early warning, and rainstorm warning is one of them. There are many levels of rainstorm warning, so what are the levels of rainstorm?

What is the grade of rainstorm? 1 rainstorm is divided into four levels: rainstorm blue warning, rainstorm yellow warning, rainstorm orange warning and rainstorm red warning.

I. blue rainstorm warning

Standard:/kloc-within 0/2 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

Defense guide:

1, the government and relevant departments should prepare for the rainstorm according to their duties;

2. Schools and kindergartens should take corresponding measures to ensure the safety of students and children;

3. Drivers should pay attention to road water and traffic jams to ensure safety;

4, check the city, farmland, fish pond drainage system, drainage preparation.

Second, the rainstorm yellow warning

Standard: The rainfall will reach more than 50 mm within 6 hours, or it has reached more than 50 mm and the rainfall may continue.

Defense guide:

1, the government and relevant departments should do a good job in rainstorm prevention according to their duties;

2. The traffic management department takes traffic control measures in heavy rainfall sections according to the road conditions, and implements traffic guidance in waterlogged sections;

3. Cut off the dangerous outdoor power supply in low-lying areas, suspend outdoor work in open-air places, and transfer people in dangerous areas and residents of dangerous houses to safe places for shelter from the rain;

4, check the city, farmland, fish pond drainage system, take the necessary drainage measures.

Third, the rainstorm orange warning

Standard: within 3 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

Defense guide:

1, the government and relevant departments should do a good job in emergency prevention of rainstorm according to their duties;

2. Cut off dangerous outdoor power supply and suspend outdoor work;

3. Units in dangerous areas should suspend classes or business, and take special measures to protect the safety of students, children and other staff who have arrived at school;

4, do a good job in urban and farmland drainage, pay attention to prevent possible disasters such as flash floods, landslides and mudslides.

Fourth, the rainstorm red warning

Standard: within 3 hours, the rainfall will reach 100 mm or above, or it has reached 100 mm and the rainfall may continue.

Defense guide:

1, the government and relevant departments shall, in accordance with their duties, do a good job in emergency rescue against rainstorm;

2. Stop assembly, suspend classes and suspend business (except for special industries);

3, do a good job in mountain torrents, landslides, mudslides and other disasters prevention and rescue work.

What are the grades of rainstorm? 2 Heavy rain is divided into three grades: heavy rain, heavy rain and heavy rain. According to China's meteorological regulations, rain with a precipitation of more than 50 mm in 24 hours is called "rainstorm". According to its precipitation intensity, it is divided into three grades, that is, the 24-hour precipitation is 50 ~ 99 mm and 9 mm, which is called "rainstorm"; /kloc-rainstorm below 0/00 ~ 250 mm; More than 250 mm is called "rainstorm".

Cause of rainstorm:

The formation process of rainstorm is quite complicated. Generally speaking, sufficient and continuous water vapor, strong and lasting upward movement of airflow and instability of atmospheric structure are the main physical conditions for heavy rain. The favorable combination of various scales of weather system and underlying surface, especially topography, can produce heavy rain.

Rainstorms often fall from cumulonimbus clouds. The conditions for the formation of cumulonimbus clouds are that the atmosphere contains enough water vapor and there is a strong upward movement to transport the water vapor quickly. The water droplets in the cloud are constantly affected by the upward movement, and they suddenly fall to the ground until the updraft can't support them.

What are the grades of rainstorm? 3 points is 6 grades. Light rain, moderate rain, heavy rain, heavy rain, heavy rain, heavy rain.

1, light rain: 1d (or 24h) rainfall is less than 10mm.

2. Moderate rain: 1d (or 24h) rainfall 10 ~ 25mm.

3. Heavy rain: 1d (or 24h) rainfall is 25 ~ 50mm.

4. Rainstorm: 1d (or 24h) rainfall is 50 ~100 mm.

5. rainstorm: 1d (or 24h) rainfall 100 ~ 250mm.

6. Extraordinary rainstorm: 1d (or 24h) rainfall is more than 250mm.

There are many reasons for the rain, and the manifestations are also unique, such as Mao Mao rain, continuous rain, pouring rain and so on. After the water on the earth is irradiated by sunlight, it becomes steam and is evaporated into the air.

Water vapor condenses into small water droplets when it meets cold air at high altitude. These water droplets are very small, with a diameter of only 0,01~ 0,02 02mm, and the largest is only 0,2 mm. They are small and light, and they are held in the air by the updraft in the air. It is these small water droplets that gather in the air to form clouds.