Is color warning useful in weather forecast? How much do people who don't surf the Internet know?

(1) Flood Blue Warning (Grade IV)

If a blue warning is received, it means that the water level of urban rivers may reach the warning level and the water level may continue to rise; Or some urban roads, overpasses and low-lying areas began to accumulate water, and some houses were flooded.

(2) Yellow flood warning (Grade III)

Receiving a yellow warning 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 urban rivers exceeds the warning level, and the water level may continue to rise; Or some urban roads, overpasses, and low-lying places have accumulated water to affect traffic.

After receiving the yellow warning, citizens are advised to go out less, drive less, and don't stay in dangerous houses to avoid the rain.

(3) Flood orange warning (Grade II)

If the main spillway in the urban area begins to overflow; Or the southern mountain reservoirs that have an impact on the urban area may be in great danger, which is expected to have a greater impact on the urban area; Or the Yellow River may flood or burst its banks, seriously affecting the safety of the city, and an orange warning will be issued.

Once the orange warning is issued, citizens are advised to stay at home, do not go to suburbs and mountainous areas, and try to avoid staying in low-lying areas or underground passages.

(4) Red flood warning (Grade I)

Only in Xiaoqing River, serious backward flow is possible; The reservoirs in the southern mountainous areas that have an impact on the urban area may be in great danger, which may pose a great threat to the urban area; The Yellow River flood may flow backward into the urban area, or the Meteorological Observatory may issue a red rainstorm warning.