The symbol of the north wind level 6

The symbol of the north wind level 6 is as follows: Answer A. It means the north wind level 6,

Generally, the foot of an "F" indicates the wind direction, which direction indicates which direction the wind blows, and symbols similar to ribbons indicate the wind force, and each ribbon indicates the secondary wind, for example, three ribbons indicate the sixth wind.

But the number of ribbons will not exceed three, because too many ribbons will be difficult to read. Therefore, when expressing winds of magnitude 8 or above, another sign will be used, which is what you call the "red flag". Generally, one flag indicates level 8. If it is level 10, a ribbon will be added below.

The wind rating table is based on the wind speed of 10 meters above the ground on the flat land. Generally, it is expressed by 0 to 12 * * 13, but in special circumstances, there is a wind level above 13. For example, when Typhoon Sang Mei hit Fujian in 2006, the maximum gust measured at Hezhangyan in Fuding was above 17 (75.8m per second).

Wind speed is the forward speed of the wind. The greater the air pressure difference between two adjacent places, the faster the air flow, the greater the wind speed and the greater the wind force. Therefore, the magnitude of wind is usually expressed by wind power. The unit of wind speed is meters per second or kilometers per hour. When releasing the weather forecast, the formula is "from all the way to nine, all levels are multiplied by two."

It means: from 1 to 9 winds, multiply each level by 2, and you can roughly get the maximum wind speed. For example, the maximum speed of the first wind is 2 meters per second, the second wind is 4 meters per second, the third wind is 6 meters per second, and so on.

There are also transitional figures between different levels of wind, such as the first level wind1-2m per second, the second level wind 2-4m per second, the third level wind 4-6m per second, and so on. Wind power can also be converted into corresponding wind speed, that is, the distance that air flows in unit time, in meters per second.

Its conversion formula is for reference: two, two to one is one, and three levels plus one. Grades four to nine are not difficult to calculate, and the series is reduced by two times three. Ten to twelve are rare, so ten is easy to remember. Ten-level wind speed is twenty-seven, with one more level every four levels. ?

That is, the wind speed of the primary wind is equal to 1 m/s, the wind speed of the secondary wind is equal to 2m/s, the wind level of the tertiary wind is added with 1, and its wind speed is equal to 4m/s, and the series from 4 to 9 is subtracted by 2, and then multiplied by 3 to get the corresponding wind speed.

The wind speed algorithm from 10 to 12 is the same. The wind speed of 10 is 27m/s, and then the wind speed of 1 1 is 3 1m/s by adding 4, and the wind speed of 12 is 35m/s. ..