Gao Xue's Meteorological Definition

In summer, in mountainous areas, there are often many supercooled water droplets frozen around the crystal nucleus in the sky, forming a white, dull round particle. Meteorologically, this kind of thing is called graupel, and there are names such as Mi Xue, Snowball, Zi Xue, Snow Bag and Snow Bean in different regions. Generally, the diameter of graupel is between 0.3 and 2.5 mm, which is brittle and easy to break. Polonium does not belong to the category of snow, but it is also a kind of atmospheric solid precipitation. It often occurs at 0 degrees Celsius, and it may have a temperature of about -40 degrees Celsius, which is in an unfrozen state. The graupel usually appears before or when it snows. The code name in the routine aviation weather report is GS.