Why are the clouds in Ulaanbaatar always round?

The cloud picture of Ulaanbaatar is always round, which is related to radar failure. There is a big circle in the satellite cloud picture, which is related to radar failure. Satellite cloud picture, an image of cloud cover and surface characteristics on the earth observed from top to bottom by meteorological satellites. The received cloud pictures mainly include infrared cloud pictures, visible light cloud pictures and water vapor cloud pictures. Using satellite cloud images, we can identify different weather systems, determine their positions, estimate their intensity and development trend, and provide basis for weather analysis and weather forecast. In areas lacking meteorological observation stations such as oceans, deserts and plateaus, the information provided by satellite cloud images makes up for the deficiency of conventional detection data and plays an important role in improving the accuracy of forecasting.