Typhoon precautions and typhoon conditions

A mature typhoon is divided into three parts according to its structure and the weather it brings: the typhoon eye, the vortex wind and rain area, and the peripheral strong wind area. Follow me now to find out.

Typhoon prevention measures

1. It may or has been affected by a tropical cyclone within 24 hours. The average wind force along the coast or land reaches level 6 or above, or the gust reaches level 8 or above and may continue.

1 *** and relevant departments shall make preparations for typhoon prevention in accordance with their duties;

2 Stop open-air collective activities and dangerous outdoor operations such as high altitude;

3 Active response measures should be taken for water operations in relevant waters and passing ships, such as returning to the port to take shelter or sailing in detours;

4 Reinforce doors, windows, hoardings, scaffoldings, billboards and other structures that are easily blown by the wind , cut off dangerous outdoor power.

2 It may or has been affected by a tropical cyclone within 24 hours. The average wind force along the coast or land reaches level 8 or above, or the gust reaches level 10 or above and may continue.

1 *** and relevant departments shall make emergency preparations for typhoon prevention in accordance with their duties;

2 Stop indoor and outdoor large-scale storms and high-altitude and other dangerous outdoor operations;

3 Take proactive measures for water operations in relevant waters and passing ships to reinforce port facilities to prevent ships from anchoring, stranding and collisions;

4 Reinforce or dismantle structures that are easily blown by the wind, People should not go out at will, ensure that the elderly and children stay in the safest place at home, and move people in dangerous buildings in a timely manner.

3 It may or has been affected by a tropical cyclone within 12 hours. The average wind force along the coast or land reaches level 10 or above, or the gust reaches level 12 or above and may continue.

1 *** and relevant departments should do a good job in typhoon prevention and emergency response according to their duties;

2 Stop large-scale indoor and outdoor activities, suspend classes, and suspend business except for special industries;

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3 Relevant emergency response departments and rescue units should strengthen their duties, closely monitor the disaster situation, and implement response measures;

4 Water operations in relevant waters and passing ships should return to the port to take shelter, strengthen port facilities, and prevent ships from Anchor walking, stranding and collision;

5 Reinforce or dismantle structures that are easily blown by the wind. Personnel should stay in a wind-proof and safe place as much as possible. When the center of the typhoon passes, the wind will decrease or remain still for a period of time. time, remember that strong winds will blow suddenly, you should continue to stay in a safe place to take shelter, and people in dangerous buildings should be moved in time;

6 Relevant areas should pay attention to preventing flash floods and geological disasters that may be caused by heavy precipitation.

Conditions for typhoons

From the structure of typhoons, we can see that there must be unique conditions for the generation of such a huge behemoth.

1. There must be a broad atmosphere of high temperature and high humidity. The temperature and humidity of the bottom atmosphere on the tropical ocean are mainly determined by the sea surface water temperature. Typhoons can only form on warm ocean surfaces where the sea temperature is higher than 26°C-27°C, and the seawater temperature within 60 meters is higher than 26°C. ℃-27℃;

2. There must be an initial disturbance in which the lower atmosphere converges toward the center and the upper atmosphere diffuses outward. Moreover, high-level divergence must exceed low-level convergence to maintain sufficient updraft and low-level disturbances to continue to strengthen;

3. The wind speed in the vertical direction cannot differ too much, and the relative movement of the upper and lower air is very small. The latent heat energy released by the condensation of water vapor in the initial disturbance is concentrated and stored in the air column in the typhoon eye area, forming and strengthening the typhoon warm center structure;

4. There must be a large enough geostrophic deflection force for the earth to The rotation is conducive to the generation of cyclonic vortices. The geostrophic deflection force is close to zero near the equator and increases toward the north and south poles. Typhoons occur on the ocean surface about 5 latitudes or more from the equator.

The huge energy contained in typhoons

The huge energy contained in typhoons can be explained by the precipitation it brings.

According to research, on average, a typhoon can rain 15 millimeters, or 2.1×1016 cubic centimeters, within a radius of 665 kilometers in one day. The latent heat released by this much precipitation is 5.2×1019 Joules/day and 6.0×1014 watts, which is equivalent to 200 times the world’s total power generation!

The huge energy contained in a typhoon can also be explained by the wind energy kinetic energy brought by its strong winds. Assuming that a mature typhoon has an average wind speed of 40 meters/second within a radius of 60 kilometers, the energy required to maintain such strong winds is about 1.5×1012 watts, which is equivalent to half of the world’s total power generation, which is also very amazing! < /p>

Signs of typhoons

There are always signs before the weather changes, and typhoons are no exception. In summer, we are mostly affected by the Pacific high pressure, which blows mostly southerly winds with weak force. When a typhoon approaches, the outermost circulation will arrive first. At this time, the wind direction affecting Taiwan will change from the original southerly wind. The wind is northerly, and there are downdrafts outside the typhoon. Therefore, the visibility often becomes very good two to three days before the typhoon approaches, and the mountains and trees in the distance can be clearly seen. In addition, before the typhoon comes, the outermost downdraft area will arrive first, and it is difficult for the thunderstorm to develop in the afternoon. If this phenomenon occurs when hiking in mountainous areas for several days in summer, you should be more vigilant.

Two or three days before the typhoon comes, due to the northerly wind blowing, the situation of sea and land winds will become less obvious. Two or three days before the typhoon is about to strike, when the sun sets and sinks into the horizon, it will appear on the western horizon. Several red and blue radiating lights will be emitted below, a phenomenon called reverse twilight.

In the cloud layer part: When cirrus clouds appear at high altitude and gradually thicken into cirrostratus clouds, and the cloud layer gradually decreases, it means that a typhoon is approaching in a certain place. If the typhoon gradually approaches, sudden showers will occur. It suddenly stops falling and the frequency is getting higher and higher. This also means that the typhoon is very close to Taiwan and is about to invade Taiwan. If you are still in the mountainous area at this time, you should go down the mountain as soon as possible.

As for the seaside: the wind is very weak in summer and the waves are very small. If a typhoon approaches in the distance, the long waves caused by the typhoon will first reach the seaside. In the eastern coastal areas, there will be an approaching typhoon in summer. Long waves are often seen, so do not go near the beach to watch the waves to avoid danger.