What is the wind speed grade?

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.

Extended data:

In 200 1 year, the China Meteorological Bureau issued the Regulations on Typhoon Operation and Service, which added typhoons above 12 to 17 and adopted Beaufort scale. /typhoon kloc-0/2, set at 32.4-36.9 m/s; Grade 13 is 37.0-41.4m/s; 14 is 4 1.5-46. 1 m/s, 15 is 46.2-50.9 m/s, 16 is 51.0-56. Typhoon Qionghai 30 years ago, the maximum wind force near the center was 73m/s, which exceeded the highest standard of 17. It is called 17 or above, and it is also a general statement about super typhoon in the international maritime community.

Baidu Encyclopedia-Level of Wind