What defines ice pellets in weather observations?

Ice pellets, also known as sleet, are specifically defined as transparent or translucent pellets of ice that form when raindrops freeze before reaching the ground. This freezing occurs when the raindrops pass through a layer of cold air, which causes them to solidify into small, round ice balls.

The appearance of these pellets is key in identifying them; they are not opaque like snow grains or white grains. The clarity of their appearance helps distinguish them from other forms of frozen precipitation. This unique formation process and physical characteristic make the identification of ice pellets essential in weather observations, particularly in assessing winter weather conditions and potential hazards on the ground.

Understanding this definition and formation process is critical for accurately interpreting weather data related to ice pellets and for making informed decisions in aviation and ground operations.