Grade	Risk level	Color representation	Defensive state	Degree of influence	Types of events that are more likely to occur
Level 1	high	red	Isolation alert	Especially serious impact	The occurrence of class A or class B infectious diseases under class a management; port paralysis, especially serious damage to port traffic capacity, or serious disorder of port order and significant impact, and grounding of important navigation channels. The number of participants is more than 1000, and mass vicious events such as beating, smashing and robbing occur, causing more than 30 people injured and causing more than 1 million direct property losses. It is predicted that in the next 24 hours, the wind force of force 12 or above (or the gust of force 13 or above) may occur and may continue; the rainfall will reach or have reached more than 100 mm within 3 hours, and the rainfall may continue; the weather is extremely hot, and the maximum temperature within 24 hours will reach more than 39; and strong dense fog with visibility less than 50 meters may appear or have occurred within 2 hours, and may continue.
Level 2	higher	orange	Danger alert	Serious impact	Especially serious class B or class C infectious diseases occur; local paralysis of the port, especially serious damage to port traffic capacity, or serious disorder and impact of port order, and serious blockage of important navigation channels. The number of participants is more than 300 and less than 1000, and mass malignant events, such as crowding and trampling, cause injuries to more than 10 people and less than 30 people, and cause more than 500,000 direct property losses. Tropical cyclones may or have been affected by tropical cyclones within 12 hours. It is predicted that winds of force 11 or above (or gusts of force 13 or above) may occur and may continue in the next 24 hours; the rainfall will reach or have reached more than 50 mm within 3 hours, and the rainfall may continue; the weather is extremely hot, and the maximum temperature within 24 hours will reach more than 37; and the visibility may or has been less than 200 meters in 6 hours , more than 50 meters thick fog, and may continue.
Level 3	commonly	yellow	Emergency alert	Heavy impact	General class B or serious class C infectious diseases occur; the port is blocked, the port capacity is seriously damaged, and the important waterway is seriously blocked. The number of participants is more than 30 and less than 300, and mass vicious events such as fighting, fighting and rioting occur, causing injuries to more than 3 people and less than 10 people, and causing direct property losses of more than 100,000. Tropical cyclones may or have been affected by tropical cyclones in 24 hours. It is predicted that winds of magnitude 9 - 10 or above (or gusts of force 11 - 12 or above) may occur in the sea area in the next 24 hours and may continue; the rainfall will reach or have reached more than 50 mm within 6 hours, and the rainfall may continue; the weather is extremely hot, and the maximum temperature within 24 hours will reach 35 degrees or close to 35 degrees; it may or may have occurred within 12 hours Strong fog with visibility less than 500 m and greater than 200 m may last.
Level 4	Lower	blue	Watch out	Slight impact	Mild class B or general class C infectious diseases occur; port congestion, port throughput capacity is damaged, and important navigation channels are blocked. The number of participants is more than 5 and less than 30, and a group of malignant events such as rioting occurred, causing small-scale personnel injury and causing more than 30,000 direct property losses. It is predicted that the sea area may or has been affected by mild tropical cyclones within 24 hours. It is predicted that the sea area will have wind force of magnitude 7 - 8 or above (or gusts of force 9 - 10 or above) and may continue in the next 24 hours; the rainfall will reach or have reached more than 50 mm within 12 hours, and the rainfall may continue.
Level 5	low	green	Normal operation	Basically no effect	Mild class C infectious diseases occurred; the port was unblocked, the port traffic capacity was good, and there was basically no channel blockage. There is no serious group event, no personal injury or property loss, no extreme weather impact, and the cruise ship is running normally at sea, with high visibility and little or no precipitation.