What are the four levels of flash flood warning? They are represented by colors.

According to the comparison between the predicted rainfall and the critical rainfall intensity, the severity and urgency of mountain torrents are predicted. The early warning level of flash flood rainfall intensity is divided into three levels (III, II and I). According to the severity and urgency of mountain torrents, the colors are yellow, orange and red in turn, and the warning signals of the three colors represent heavier, more serious and particularly serious respectively.

1 and Ⅲ are yellow warning signals (the warning level is heavier). Its meaning is: According to the rainfall forecast, there will be heavy rainfall within 24 hours, the rainfall intensity may approach or reach the critical rainfall intensity (≈), and the rainfall may continue, and it is predicted that serious mountain torrents may occur. At this time, supervisors should start the corresponding emergency procedures and enter the state of disaster prevention. Relevant departments should strengthen their duty and do a good job in tracking, forecasting and early warning of possible mountain torrents.

2. The second level is the orange warning signal (the warning level is serious). According to the rainfall forecast, there will be heavy rainfall within 24 hours, and the rainfall intensity is 1 ~ 2 times of the critical rainfall intensity (

Relevant departments should do a good job in tracking, forecasting and early warning of major mountain torrents, closely monitor geological disasters such as landslides and mudslides induced by rainfall, water conditions and heavy rainfall, and deploy and implement preventive measures.

3. The first level is red warning signal (the early warning level is particularly serious). It means: according to the rainfall forecast, there will be heavy rainfall within 24 hours, the rainfall intensity is more than twice the critical rainfall intensity (> 2×), and the rainfall may last for a long time.

A particularly serious flash flood disaster may occur within 24 hours. At this time, all supervisors should start special emergency procedures and enter a state of special emergency disaster prevention. Relevant departments should do a good job in monitoring, forecasting, forecasting and early warning services for major mountain torrents, and start emergency rescue plans in time.

Extended data

Self-help method

In mountainous areas, when suddenly hit by heavy rain, the river water will increase rapidly, and it is easy to burst into flash floods. The characteristics of mountain torrents are sudden and explosive.

When walking and resting in mountainous areas, we should always pay attention to the abnormal changes around the site and the optional evacuation and self-help methods. In the event of an abnormal situation, evacuate the scene quickly.

1. When threatened by flood, move to hillside and highland in an organized way.

2. When suddenly attacked by mountain torrents, be calm, don't panic, and evacuate as soon as possible. When leaving the site, you should choose the nearest safe route to run horizontally along the hillside, and never run down the hillside or downstream along the valley exit.

3. The mountain torrents are rushing and rising rapidly. Don't swim easily, lest you be washed away by mountain torrents. Attention should also be paid to prevent landslides, rolling stones and mudslides when flash floods occur.

4. When suddenly trapped by floods in hills, platforms or solid residential buildings with solid foundations, in hilly environment, no matter whether one person or many people, just insist on orderly rescue or wait for the steep flash floods to subside.

5. If you are caught off guard and trapped in a low-lying creek bank, ridge or wooden house by flood, and have communication conditions in an emergency, you can use communication tools to report the flood situation and the trapped situation to the local government and flood control department and ask for rescue; If there are no communication conditions, you can set off fireworks or wave brightly colored clothes back and forth or collectively call for help. At the same time, floating objects such as boats, rafts, door panels and wooden beds should be used as much as possible to transfer water.

6. If you find that the high-voltage tower is skewed, the wires are drooping or broken, stay away from danger, and don't touch or get close to it to prevent electric shock.

7, after the flood, to do a good job of health and epidemic prevention, pay attention to drinking water hygiene, food hygiene, to avoid infectious diseases.

Residents in plain areas and low-lying areas who have no time to move are often easily submerged or besieged by floods. If this happens, the usual effective methods are:

1. Arrange family members to move to the roof to try to stabilize their mood.

2. Send a distress signal as far as possible and get in touch with the outside world as soon as possible so as to get timely rescue.

3. Use drifts such as bamboo and wood to escort your family to nearby tall buildings or safer places.