Orange disaster weather

Typhoon warning signals are divided into four levels, which are represented by four colors: blue, yellow, orange and red.

1, blue: it means that the typhoon may affect this area, but the wind is weak and will not cause obvious harm to people and things.

2. Yellow: It means that the typhoon is getting stronger and stronger, and the wind is gradually increasing, which may pose a greater threat to people and materials in this area.

3. Orange: It means that the typhoon is very strong, which may cause serious damage and danger to this area. People should take safety precautions and take necessary emergency measures.

4. Red: It means that the typhoon is already very serious and the wind is extremely strong, which is very likely to cause major disasters and dangers in this area. People should take all necessary precautions immediately and be alert to possible evacuation instructions.

The red warning indicates that it may be or has been affected by tropical cyclones within 24 hours, and the average wind force can reach above 8 or gust 10. Or have been affected by the typhoon, the average wind force is 8 ~ 9, or the gust 10 ~ 1 1 will continue.

the typhoon red warning signal

The horizontal distribution of various meteorological elements and weather phenomena in typhoon can be divided into three areas: outer cloud area (including outer cloud area and inner cloud area), cloud wall area and typhoon eye area. The vertical direction can be divided into three levels: low-altitude inflow layer (below about 1 km), high-altitude outflow layer (above about 10 km) and middle-level updraft layer (from about 1 km to 10 km) (Figure 1 typhoon structure diagram).

In the lower layer around the typhoon, several spiral air currents with isobars in the typhoon area are involved in the typhoon area and converge to rise, which promotes the development of the convective cloud system and forms the outer and inner cloud areas of the typhoon. There are several spiral rain belts in the corresponding cloud system.

The more spiral airflow involved in a typhoon, the faster the tangential wind speed becomes. At a certain distance from the typhoon center, the airflow no longer hovers, so a lot of wet air is forced to rise strongly, forming a towering cloud wall around the center. The top of the cumulonimbus cloud wall can be as high as 19 km, which is the cloud wall area.

The above contents refer to Baidu Encyclopedia-Typhoon red warning signal.