Generally, storm surges are divided into four levels. What are they?

Storm surge warning levels are divided into four levels: I, II, III and IV, and the colors are red, orange, yellow and blue in turn.

1, level 1 emergency warning of storm surge (red)

Affected by tropical cyclones (including typhoons, strong tropical storms, tropical storms and tropical depression, the same below) or temperate weather systems, it is expected that when one or more representative tide stations in the affected coastal areas will have a high tide level that reaches or exceeds the local warning tide level by more than 80 cm in the future, an emergency storm surge warning will be issued at least 6 hours in advance.

2. Level II emergency warning of storm surge (orange)

Affected by tropical cyclones or temperate weather systems, it is expected that in the future, when one or more representative tide stations in the affected coastal areas will reach or exceed the local warning tide level of more than 30 cm and less than 80 cm, an emergency warning of storm surge level II will be issued at least 6 hours in advance.

3. Storm surge warning level 3 (yellow)

Affected by tropical cyclones or temperate weather systems, when it is predicted that one or more representative tide stations in the affected coastal areas will have a high tide level within 30cm from the local warning tide level, the former will issue a storm surge warning at least 12 hours in advance, and the latter will issue a storm surge warning at least 6 hours in advance.

4, storm surge ⅳ forecast (blue)

Affected by tropical cyclones or temperate weather systems, it is predicted that during the forecast period, one or more representative tide stations in the affected coastal areas will have a high tide level 30 cm below the local warning tide level, and a storm surge forecast will be issued.