What is the weather warning? How many levels are there?

Thirteen kinds of weather warning signals, such as typhoon, rainstorm, lightning and high temperature, are blue, yellow, orange and red respectively. Blue is the lowest grade and red is the highest grade, which means that the bad weather in Chengdu is the most serious, from low to high. There are different weather warnings in different seasons and different time periods.

1. Take summer high temperature warning as an example. Generally blue, yellow, orange and red. Generally yellow, orange and red. Orange means that the maximum temperature rises above 37 degrees Celsius within 24 hours. When the red warning is the hottest, it is easy to get sunburned and there is a fire hazard. The maximum temperature rises above 40 degrees Celsius. Therefore, when you see the notice issued by the meteorological department, you should pay attention to vigilance, prevent the safety of life and property caused by bad weather, and pay attention to sun protection.

2. Taking rainstorm warning as an example, four grades of blue, yellow, orange and red are generally issued. When the rainstorm reaches red warning signal, it means that within three hours, the accumulated rainfall may reach or exceed 100mm and may continue to rise, and the water depth of 100mm has basically not exceeded the ankle position of adults. In fact, within 24 hours, when the accumulated rainfall reaches more than 100 mm, it reaches the level of torrential rain. When the rainstorm red warning is issued, it shows that the rain on this day will be completed within 3 hours, which shows that the rain is turbulent and heavy. At this time, the soil in the valley will become soft under the scouring of rain, which is easy to cause secondary injuries, mudslides and landslides. The reservoir will also be in a state of emergency, and the department should do a good job in emergency rescue of rainstorm. Within the scope of all units, schools, companies, etc. Business should be stopped immediately and countermeasures should be taken.

3. Take typhoon warning as an example. Generally blue, yellow, orange and red. When the typhoon arrives, it will reach the red warning, indicating that there will be strong typhoons and super typhoons landing in China. Once the typhoon warning is issued, it means that it has entered an emergency windproof state, and measures need to be taken to ensure the safety of life and property.

When the weather warning reaches the red warning, everyone should take major preventive measures.