What's the wind speed?

1, wind speed 12. The magnitude of wind speed is often expressed by several winds. The level of wind is determined according to the degree of influence of wind on ground objects. Meteorology is generally divided into twelve grades according to the magnitude of wind.

A 2.0 wind is also called no wind. Level 2 wind is called breeze, the leaves are slightly noisy, and people feel windy. Level 4 wind is called breeze, and the twigs of trees shake, which can blow up dust and paper on the ground. The 6-level wind is called strong wind, the branches are shaking, the wires are whistling, and it is difficult to walk with an umbrella. The 8-level wind is called strong wind, the twigs of trees can be broken, and people walk against the wind with great resistance. 10 wind is called gale, which is rare on land. Trees can be pulled up and buildings are seriously damaged. Winds above 12 are called typhoons or hurricanes, which are extremely destructive and rarely seen on land.

Actually, 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.

4. In the weather forecast, we often hear the expression "the north wind is 4 to 5", and the wind force referred to at this time is the average wind force; If you hear the expression "gust 7", gust refers to the wind with high and low wind speed, and the wind at this time refers to the maximum wind force.