Determination of cloud height

Instruments for measuring cloud height include: balloon, cloud power lamp, laser lamp cloud meter, etc.

(2) estimation

The height of clouds is estimated by visual estimation, empirical formula calculation or height estimation of known targets.

(1) Visual cloud height

First of all, it is necessary to determine whether it is a high cloud or a medium-low cloud, and what kind of cloud it is. In order to accurately record the cloud height, continuous and systematic observation is carried out, combined with the weather system, the weather phenomenon and the change characteristics of elements, and then the basic knowledge of meteorology is used for comprehensive analysis and judgment, and finally the common cloud height range in this area is estimated.

② Use empirical formula to calculate cloud height.

Where h represents the height of the cloud; T is the ground temperature; Td is the ground dew point temperature; γd is the dry adiabatic decline rate; γz is the drop rate of dew point temperature. It can be seen that the height of the cloud depends on the humidity of the air layer near the ground. High humidity, high and low clouds; On the contrary, the cloud height is high.

③ Estimate the height of cloud by using the known target height.

When there are tall objects such as mountains, tall buildings and towers near the station, the height of these objects can be used to estimate the height of clouds. First of all, we should know or determine the height of obvious parts such as the top of the target. When the cloud bottom touches the target or covers a part of the target, we can estimate the height of the cloud according to the known height.