Why is the weather changeable on a rainy day? What colors do they have?

This is due to the fact that the clouds are constantly changing during the rain, which is why they are so varied. Gray, white, blue, purple, pink.

On rainy days, the climate is unstable, with a lot of strong convective weather, gray, yellow and white.

Precipitation in the weather forecast Liang Song: It is the depth of liquid or solid (after melting) precipitation in a certain period of time, without evaporation, infiltration, and loss, and the accumulation of the area of the unit oak digging. In millimeters.

The Meteorological Observatory has an instrument that is placed outdoors, and the main structure inside is a cylindrical container. The function is to collect rainwater in a scattered range on a rainy day. After the rainwater flows into the cylindrical container, the level scale on the container is read, and this value is the amount of precipitation.

Because the range of rainwater is very small, the amount will not be very large, so mm (millimeter) is used as the height unit of rainwater. As for the h and r that follow, they represent time and radius, respectively. Connected mm hr means:

The amount of precipitation per hour per unit area is simply understood: the amount of precipitation per hour.

Blue indicates that the area is covered by precipitation clouds, but no rain has yet occurred; Green indicates that the Hayashu area is immersed in drizzle; Yellow to red indicates moderate to heavy rain in the area; Purple nuclei indicate that the region has the highest intensity of precipitation, and the region is "falling" into heavy rain or even heavy rain, and may be accompanied by severe weather such as thunder, lightning, strong winds and even hail. “

Weather precipitation color is used to represent different rainfall, green is used to indicate light rain or Henghao is drizzle, at this time to say that the bush can basically not play an umbrella, nor do you feel Zheng Cheng Xiang travel, if it is green, it is just that the rain is more urgent, you must play an umbrella to travel, as for the red, it is more urgent, purple is the highest level, that.

(1) Blue Flood Warning (Level IV).

If you receive a blue alert, it means that the water level in the urban river may be at the warning level and the water level may continue**; Or some urban roads, overpasses, and low-lying areas begin to accumulate water, and some houses are flooded.

2) Yellow Flood Warning (Level III).

Receiving a yellow alert means that the following situations may occur: the reservoirs in the southern mountainous areas that have an impact on the urban area may be in danger and may have a certain impact on the urban area; or the water level of the river in the urban area exceeds the warning water level, and the water level may continue**; or the water accumulation conditions in some urban areas, under overpasses, and low-lying areas affect traffic.

After receiving the yellow warning, the public is advised to reduce going out, reduce driving out, and do not stay in dilapidated houses to take shelter from the rain.

3) Orange Flood Warning (Level II).

If the main drainage channels in the urban area begin to overflow; or the reservoirs in the southern mountainous areas that have an impact on the urban area may be in greater danger and are expected to have a greater impact on the urban area; Or the Yellow River may overflow or burst, seriously affecting the safety of the city, and an orange warning will be issued.

Once an orange alert is issued, members of the public are advised to stay at home, refrain from activities in rural areas and mountainous areas, and avoid staying in low-lying areas or underpasses as much as possible.

4) Red Flood Warning (Level I).

Only in the Xiaoqing River is there a possibility of serious backfilling; Reservoirs in the southern mountainous areas that have an impact on the urban area may be in major danger and may pose a major threat to the urban area; The Yellow River flood may flood the urban area, or the Red Rainstorm Warning is issued when the Meteorological Observatory issues a red rainstorm warning.

The rain warning is red and severe. Refers to the amount of rain that has reached more than 100 mm in 3 hours, or has reached more than 100 mm and the rain is likely to continue. The rainstorm warning signal is an early warning signal made by the meteorological department before the arrival of the rainstorm through meteorological monitoring, and the rainstorm warning signal is divided into four levels, which are represented by blue, yellow, orange and red, of which the red rainstorm warning signal is the highest level.

1. The standard of blue warning for heavy rain: the rainfall within 12 hours reaches more than 50 mm, or has reached more than 50 mm and the rain may continue.

2. The standard of yellow warning for heavy rain: the rainfall has reached more than 50 mm within 6 hours, or has reached more than 50 mm and the rain may continue.

3. The standard of orange warning for heavy rain: the rainfall within 3 hours is more than 50 mm, or the rainfall has reached more than 50 mm and the rain may continue.

4. The standard of red warning for heavy rain: the rainfall within 3 hours is more than 100 mm, or the rainfall has reached more than 100 mm and the rain may continue to return.

There are four levels of rainstorm warning signals, which are indicated by blue, yellow, orange and red, with the red rainstorm warning signal being the highest level (most severe).

We generally receive different degrees of warnings in rainstorm weather, reminding everyone whether today's travel is appropriate, so among these rain warnings, what color is the most serious? I'll take you to find out.

01 Blue Alert: More than 50 mm of rain will fall in 12 hours, or it has reached more than 50 mm and the rain is likely to continue.

Prevention guidelines: ** and relevant departments should prepare for rainstorms in accordance with their duties; Schools and kindergartens take appropriate measures to ensure the safety of students and young children; Drivers should be aware of water and traffic congestion on the road to ensure safety.

02 Amber Alert: More than 50 mm of rain will fall within 6 hours, or it has reached more than 50 mm and the rain is likely to continue.

Prevention guidelines: ** and relevant departments should do a good job of rainstorm prevention in accordance with their duties; The traffic management department shall, according to the road conditions, take traffic control measures in the heavy rainfall section; Cut off the outdoor power supply in low-lying areas with dangerous conditions, and suspend outdoor operations in open areas.

03 Orange Warning: More than 50 mm of rain will fall within 3 hours, or it has reached more than 50 mm and the rain is likely to continue.

Prevention guide: ** and relevant departments should do a good job of rainstorm prevention and emergency response in accordance with their duties; cut off dangerous outdoor power supply and suspend outdoor operations; Units in dangerous areas shall suspend classes or businesses; Do a good job in the drainage of cities and farmland, and pay attention to preventing disasters such as flash floods, landslides, and debris flows that may be caused.

04 Red Alert: More than 100 mm of rain will fall within 3 hours, or it has reached more than 100 mm and the rain is likely to continue.

Prevention guide: ** and relevant departments in accordance with their duties to do a good job of rainstorm emergency and rescue work; Suspension of assemblies, suspension of classes, suspension of business (except for special trades); Do a good job in the prevention and rescue of disasters such as mountain floods, landslides, and debris flows.

Everything in the world is changing, the mood, the weather, the amount of traffic, and the traffic are all changing, and they don't stand still because of time.

The weather forecaster will change color.

The color is a table of how good or bad the weather is, and the grade is not a matter of time.