What does Kavok mean in the land-air dialogue?

In the visibility group, weather phenomenon group and cloud group, the conditions are as follows:

1: effective visibility 10km or more;

There is no cloud below 2: 1500 m, and there is no trace of cumulonimbus and other disastrous weather in the sky;

3. No precipitation, thunderstorms, sandstorms, snow blowing and other weather.

I'd be happy to answer your questions.