What is the concept of super gust attacking Nanning gust 7-8?

Recently, many areas in China have been affected by fireworks and typhoons. We all know the rainstorm in Zhengzhou, and there has been a strong wind in Nanning recently. Then let's learn about the super gust that raided Nanning. What is the concept of gust 7-8?

Super gust raided Nanning

On August 2nd 17: 52, influenced by strong convective clouds, there was a gust of more than 7 in Nanning. On the evening of August 2, a strong wind and rainstorm raided Nanning, with a local gust of more than 9, accompanied by lightning and short-term heavy precipitation. The wind is very strong, causing great losses. The rainstorm hit Nanning, causing many objects in the urban area to be blown down. The report also mentioned that Guantangpo, Tangsan Town, Nanning City was seriously affected. A nursery lost nearly 300 seedlings, and the owner had to ask the crane to straighten the seedlings, resulting in a loss of nearly100000 yuan. Because the strong wind blew off a high-voltage power line and several low-voltage power lines, the electricity consumption of residents has not been restored.

What is the concept of gust 7-8?

Level 7 wind is called gale, and the wind speed is 13.9 ~ 17. 1 (m/s). On land, the whole tree is shaking, so it is inconvenient to walk in the wind. There are huge waves at sea. Grade 8 wind is called gale, and the wind speed 17.2~20.7 (m/s). On land, the situation is that tiny branches are damaged, so people feel great resistance when they move forward. There are violent waves on the sea. Wind has both magnitude and direction, so the wind forecast includes wind speed and direction. The magnitude of wind speed is usually expressed by wind grade. The level of wind is determined according to the degree of influence of wind on ground objects. Meteorology is generally divided into seventeen grades according to the magnitude of wind. In the weather forecast, we often hear the expression "the north wind is 4 to 5", in which the wind refers to the average wind; If you hear the phrase "gust 7", gust refers to the wind with high and low speed, and the wind at this time refers to the high-speed wind. In fact, in nature, the wind sometimes exceeds 12. For example, the central wind force of a strong typhoon or tornado may be much larger than the magnitude of 12, but the wind above the magnitude of 12 is rare, so the magnitude is generally not specified.

What if the wind comes?

1. Go out as little as possible, ride less bicycles when you have to go out, and don't stay under billboards and temporary buildings for shelter.

If you are driving, you should drive into the underground parking lot or bomb shelter.

If you live in a tent, you should immediately put away your tent and take shelter from the wind in a strong house.

4. If you are working or swimming on the water, you should immediately go ashore to avoid the wind; Ships should obey orders and return to Hong Kong for shelter. Sailing boats should put down their sails as soon as possible.

5. Close the window carefully in the room, and stick a "meter" tape on the window glass to prevent the glass from breaking; Stay away from windows to avoid strong winds sweeping sand and breaking glass and hurting people.

6. In public places, it should be evacuated to designated places.

Agricultural production facilities should be reinforced in time and mature crops should be harvested as soon as possible.

How is the strong wind formed?

Wind is caused by solar radiation heat. Sunlight shines on the earth's surface, causing the surface temperature to rise, and the surface air to expand and become lighter and lighter. After the hot air rises, the cold air with low temperature flows in horizontally, and the rising air falls down because it gradually cools and becomes heavier. Because the surface temperature is high, it will heat up the air, and this airflow will produce wind. The wind on the earth is related to the water source, and the wind is produced by the expansion and contraction of water and steam. When the gathered water vapor (cloud) forms water, its volume shrinks, and the surrounding water vapor comes to replenish it, forming wind.