How many kilometers is the speed of cold air per hour?

The speed at which cold air travels every hour can refer to the wind speed when cold air comes-

According to the weather forecast of the Central Meteorological Observatory today: from 08: 00 on 13 to 08: 00 on 14, there are 4 ~ 6 northerly winds in parts of central and eastern Inner Mongolia, eastern Huanghuai, eastern Jianghuai and northeastern Jiangnan. There are 7 ~ 8 winds in the Bohai Sea, most of the Yellow Sea and the western part of the East China Sea, with a gust of 9 ~ 10, and 8 ~ 9 winds in the East China Sea, with a gust of10 ~1.

As can be seen from the above weather forecast, the moving speed of cold air on land (wind speed 4-6) is slower than that at sea (wind speed 7-8 or above). This is because the cold air will be affected by the friction of the undulating ground on the land and slow down the moving speed.

In fact, cold air moves faster at high altitude, and the moving speed of 5000 meters is generally above 20-40 meters per second.

wind scale

Wind speed (m/s)

0 0.0-0.2

1 0.3- 1.5

2 1.6-3.3

3 3.4-5.4

4 5.5-7.9

5 8.0- 10.7

6 10.8- 13.8

7 13.9- 17. 1

8 17.2-20.7

9 20.8-24.4

10 24.5-28.4

1 1 28.5-32.6